14. 0, 5, 7, 8) ob_get_clean 현재 버퍼 내용 및 삭제 출력 현재 버퍼 내용을 가져오고 기본적으로 출력 삭제 ob_get_clean () ob_get_flush. The way to check for this is through ob_get_level (): echo ob_get_level (); If the result is non-zero. I must say i discovered that the problem is something between the two scripts (server_status and ranking) and not with ranking. Should you wish to use the output from the included file, you should use op_get_contents() , which will return a string of the contents of the buffer. – r3wt. Other functions are all working fine e. Gets the current buffer contents and delete current output buffer. output buffering ob_get_clean not working. Otherwise ob_get_flush () will not work. Add a comment | Your Answer Reminder: Answers generated by Artificial Intelligence tools are not allowed on Stack Overflow. The ob_get_clean() function returns the contents of the output buffer and then deletes the contents from the buffer. ob_get_clean() is returning the result of the buffer, and THEN cleaning it, triggering the callback which modifies the content. Descripción ¶. php output. Connect and share knowledge within a single location that is structured and easy to search. What I am trying to do to get rid of buffer contents is using ob_end_clean() to empty the buffer completely. This means that the output buffer is initiated and stopped with ob_end_clean(). Tôi nhắc đến cơ chế cache vì các hàm ob_start(), ob_get_contents(), ob_clean(), ob_end_flush() sẽ hỗ trợ chúng ta trong quá trình thực hiện cơ chế này. Your shortcode callback is going to output content rather than return it which is why you're seeing it appear at the top of your page. Usando ob_start le permite mantener el contenido en un buffer del lado del servidor hasta que esté listo para mostrarlo. I was trying to debug my code using error_log() and I discovered that ob_get_clean() also truncates the error_log() buffer right in the middle of its output, and well as the output buffer which it is supposed to truncate. Definition and Usage. The ob_flush () function outputs the contents of the topmost output buffer and then clears the buffer of the contents. Thanks for contributing an answer to Stack Overflow! Please be sure to answer. ob_get_clean — Get current buffer contents and delete current output buffer. I understand, that only cleanable buffer can't be flush and delete. This function discards the contents of the output buffer. I think I'll better send the output in an HTML file using the code you provided me. If you want to integrate a new plugin to sell courses and include the selection option in Tutor LMS > Settings > Monetization, then you can use the tutor_monetization_options filter. After creating a custom shortcode and inserting it into any page position, it also shows up at the top of the page, but only in Edit mode. The ob_start () function creates an output buffer. Note : The output buffer must be started by ob_start() with PHP_OUTPUT_HANDLER_CLEANABLE and PHP_OUTPUT_HANDLER_REMOVABLE flags. . Advantages of output buffering. Whether the buffer-cleaning functions _should_ invoke the output callback (keeping in mind that in themselves they do not generate. ini settings to reflect that. ob_get_clean() gets the buffer content, cleans the buffer and ends the buffering. Im novice so i dont understand what this doing. Hi, we were using html_output() to get all the tags generated by the SEO Framework 4. The W3Schools online code editor allows you to edit code and view the result in your browser1 Answer. 90% of the times I use PHP’s output buffer, I actually just retrieve the contents of it with a call to ob_get_clean() which does three things together: fetch the contents of the buffer. ob_clean () Also be aware that nothing is already being flushed with functions like echo, print_r, etc. The function will be called when the output buffer is flushed (sent) or cleaned (with ob_flush(), ob_clean() or similar function) or when the output buffer is flushed to the browser at the. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Description ¶. How to Use the ob_get_level() Function. La función ob_get_clean() es la combinación de ob_get_contents() y ob_end_clean(). Whereas all my other code that is around the wp_head is indented (tabbed) two times. 1. I prefer to be more explicit with what my code is doing, and I think it is clearer when you split getting the contents of. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Provide details and share your research! But avoid. ob_clean() - Xóa tất cả nội dung của bộ đệm đầu ra trên cùng. 0, 5, 7, 8) ob_flush (보내기) 출력 버퍼 이 함수는 출력 버퍼 (있는 경우)의 내용을 보냅니다. The rocket booster and then the spacecraft. ob_clean () Deletes all of the content from the topmost output buffer. mPDF is a PHP library which generates PDF files from UTF-8 encoded HTML. Collectives™ on Stack Overflow. No examples exist of running ob_get_clean within a while loop, and for my purpose there is no alternative. 在php的默认配置下，php输出是先输出到缓冲区（output_buffering，内存区域），然后输送到浏览器。. ob_get_clean — Get current buffer contents and delete current output buffer. Since `ob_get_clean()` accumulates the entire output in memory, dealing with large amounts of data might affect performance and memory usage. Best you can do is:. engine. As for the PHP_OUTPUT_HANDLER_* constants,. Apart from the fact that this code is a total mess and that its syntax is incorrect because of the lack of semicolon at the end of ob_flush() call, the main problem is that the filenames you read from the templist. This function does not destroy the output buffer like ob_end. But before returning the code to the caller, do the necessary text substitution. 1 Answer Sorted by: 9 This will return the same as your example given : ob_start (); echo 'custom code'; echo 'another line of custom code'; echo 'more code'; return ob_get_clean (); Share Follow answered May 18, 2017 at 10:53 George Dimitriadis 1,691 1 19 27 Add a comment Your Answer The ob_get_contents () function has different return behaivor in PHP 5. ob_get_clean ( ): string|false. I'm trying to use the get_the_content() function but instead of pulling the contents of the custom post type I've created it's pulling the contents of the page the shortcode is sitting on. WordPress has great filter support for getting at all sorts of specific bits of content and modifying it before output. Syntax. 7. 0. 168. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. – Cain Nuke Jun 25, 2019 at 23:37Off the top of my head, ob_flush() basically outputs the current buffer to PHP's internal buffer, then cleans the ob buffer. It looks like the answer is no, there is no single command to get the output buffer and erase it without turning it off. Answer to your both the question lies in output buffer(ob), Hope this will help you out in understanding. In versions of dompdf prior to 0. In such case the creation of the file can fail. Otherwise. The output buffer must be. 'options' => apply_filters('tutor_monetization_options', array( //add new monetization options here 'free' => __('Disable Monetization', 'tutor'), )),. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_flush () as the buffer contents are discarded after ob_flush () is called. Please don't revive it unless you have something important to add. I was trying to debug my code using error_log() and I discovered that ob_get_clean() also truncates the error_log() buffer right in the middle of its output, and well as the output buffer which it is supposed to truncate. 0. . Ver también. 2. PHP 8. El búfer de salida debe estar iniciado por ob_start () con el indicador PHP_OUTPUT_HANDLER_CLEANABLE Si no, ob_get_clean () no funcionará. Find centralized, trusted content and collaborate around the technologies you use most. 1. ob_end_flush (): bool. By understanding the syntax and usage of the function, you can easily start output buffering and modify your output before sending it to the client. $image_data = ob_get_contents(); ob_end_clean(); echo $image_data; unlink($nameimage); Client (192. PHP output buffer issue when using ob_gzhandler and ob_clean together. Gets the current buffer contents and delete current output buffer. I have used ob_start and ob_get_clean function to clear the buffer and it starts working. ob_get_contents simply gets the contents of the output buffer since you called ob_start (). 43. Kakou347 opened this issue on Apr 27, 2019 · 1 comment. Find centralized, trusted content and collaborate around the technologies you use most. Asking for help, clarification, or responding to other answers. ini involving setting output_buffer and/or zlib. Follow answered Feb 29, 2016 at 15:54. ob_end_clean (): bool. We get it wordpress has a function set up to pull in the content without using a buffer. Support » Developing with WordPress » ob_end_flush(): failed to send buffer of zlib output compression in ext php file ob_end_flush(): failed to send buffer of zlib output compression i…Neither discarding the buffer's contents (ob_clean() ob_end_clean(), ob_get_clean()) nor retrieving the current buffer contents (ob_get_contents(), ob_get_clean()) invoke the output callback. Just make sure that you call ob_end_flush () the appropriate number of times. Share. Follow answered Mar 1, 2011 at 23:25. The ob_get_level () function indicates how many output buffers are currently on the stack. d4rkpr1nc3. 详细描述：. Total. We hope this article has been informative and useful in understanding the ob_start () function in PHP. For example, if the page you want to render to PDF can be accessed via a web server then you can just load that page in your Dompdf script:ob_get_clean (PHP 4 >= 4. Pippin. We hope this article has been informative and useful in understanding the ob_clean () function in PHP. Teams. I read brenns10 comment's at this link. Hooking on the wp_h. ob_get_clean () is a function that gets the current output buffer contents and deletes it. Everything works normally but the returned HTML structure is broken. i dont know how you can get the gd2 resource into an object you can pass to Response::make. The reason I'm not voting for ob_get_clean is because I've had times when other developers get confused regarding what is really going on, the function name doesn't really state that the output buffering will end after it's call. Esta función desecha el contenido del búfer de salida. The output buffer must be started by ob_start () with PHP_OUTPUT_HANDLER_CLEANABLE flag. 0. It shows in the top all the time but I have read some about ob_start(); and trying to use it but the shortcode just returns nothing. 1 the document fed to dompdf would be pre-processed using PHP's eval() function when DOMPDF_ENABLE_PHP was set to true. echo str_pad ("Hello World!", 4096); // Even though the script is still running, the. There are two other functions you typically pair it with: ob_get_contents (), which basically gives you whatever has been "saved" to the buffer since it was turned on. This function will send the contents of the topmost output buffer (if any) and turn this output buffer off. output buffering ob_get. This function does not destroy the output buffer like ob_end_flush. Here is sample php code snippet for function call. . Neither discarding the buffer's contents (ob_clean() ob_end_clean(), ob_get_clean()) nor retrieving the current buffer contents (ob_get_contents(), ob_get_clean()) invoke the output callback. This function will send the contents of the output buffer (if any). After creating a custom shortcode and inserting it into any page position, it also shows up at the top of the page, but only in Edit mode. Show file. x and PHP 5. if you call ob_end_clean() after ob_start("ob_gzhandler"), the "Content-Encoding: gzip" header will still get sent (assuming the browser supports the encoding). Take a look at very simple example for PHP 5. After this you can move go on - even with only flush () instead of ob_flush (). PHP ob_end_clean does not clear buffer. Starting from ob_start(); to ob_end_clean(); nothing will be printed, I. So, it's crucial to consider. Tiện ích lọc. –As posts get their data set up via the_post() (respectively via setup_postdata()) and are therefore accessible through the API (get_the_ID() for e. Everything works normally but the returned HTML structure is broken. There are a number of functions related to output buffering, but the two we’ll use are ob_start and ob_get_clean. PHP IN DOMPDF how include ? #1924. This is not always the same as the number of characters because some characters may have more than one byte. คำอธิบายที่ดี ฉันจะไปอีกขั้นหนึ่งแล้วแทนที่ob_get_contents()ด้วยob_get_clean()และลบob_end_clean()เนื่องจากจะob_get_clean()ทำหน้าที่ทั้งสองอย่างเป็นหลัก การ. To review, open the file in an editor that reveals hidden Unicode characters. ). If I remove the ob_end_clean(); the output is hi hi. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. It is the same as the following statement, which might be better to understand: "If ob_get_level () returns a 'truthy' value (is not 0 but. Collectives™ on Stack Overflow. Sorry to resurrect a 4 year old post, but I stumbled across it and wanted to point out that ob_get_contents() followed by ob_clean() is not exactly the same as ob_get_clean(). So, fortunatly there is some php tools that do interpret the page and can fetch any sub files. Oct 16, 2014 at 16:02. Q&A for work. Example #2. This function discards the contents of the topmost output buffer and turns off this output buffering. 首先，我們先來看看不讓 echo 之類的內容列印輸出。. Enabling output buffering decreases the download time it takes and renders the HTML in the browser. Shortcodes have to return their. ob_get_clean, only works twice. output_compression to 0 or Off; 3) setting Apache variables such as "no-gzip" either through apache_setenv () or through entries in . 2k 11 11 gold badges 115 115 silver badges 109 109 bronze badges. When ob_end_clean is called, it turns off buffering. When I run in terminal php artisan migrate this results in 'Nothing to migrate' when indeed there is nothing to migrate. Improve this answer. 8) and im getting this error: Fatal error: Cannot instantiate abstract class Renderer in C:xampphtdocs. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_flush () as the buffer contents are discarded after ob_flush () is called. Otherwise ob_get_clean() will not work. The output buffer must be started by ob_start () with PHP_OUTPUT_HANDLER_CLEANABLE flag. php - output buffering ob_get_contents not returning anything. Learn more about CollectivesCollectives™ on Stack Overflow. Conclusion. ob_clean() This function removes what is stored in the output buffer. ob_get_clean () exécute successivement ob_get_contents () et ob_end_clean. The ob_get_contents() function is a built-in function in PHP that allows you to get . Output buffering should be taking place inside your shortcode callback. output_callback. php Project: jiatower/php. This will help you better understand. These are the top rated real world PHP examples of ob_GET_clean extracted from open source projects. // Some browsers will not display the content if it is too short. One way of outputting a webpage to mPDF without re-writing your scripts too much, is to buffer the output: MpdfMpdf () - Initialise an instance of mPDF class, and specify configuration. ob_get_contents — Return the contents of the output buffer. Si no, ob_clean () no funcionará. However ob_get_clean() retrieves the contents first, and then cleans the buffer. Note, this section of your code:Capture HTML output. We use ob_end_clean() with ob_get_contents() which first gets the contents as a string and then the output buffer is cleaned and turned off, this clears the global stack and keeps the whole content in a variable to be processed. ob_flush. When placing a shortcode on a custom WordPress page the output is always displayed at the top of my page content. For example: buffer is empty; echo 'hello' - output buffer has "hello" stringIn this article, we will take an in-depth look at the ob_get_length() function and its usage. Flags can be used to permit or restrict what the buffer is able to do. I think that function will be prone to further bugs, therefor using ob_start/ob_end_clean is easier to comprehend. If you just want to clean the buffer after starting output buffering with. ob_get_clean() essentially executes both ob_get_contents() and ob_end_clean(). Note: This function is similar to ob_end_flush (), except that this function also returns the. ob_get_contents simply gets the contents of the output buffer since you called ob_start (). For example: use function OutputControlob_start; use function OutputControlob_end_flush; use function OutputControlob_get_clean; ob_start ();. This is a bit harsh. The ob_start () function creates an output buffer. If your JavaScript needs something from the server in order to know to redirect or not, do so via an Ajax request. ob_get_clean — Get current buffer contents and delete current output buffer. The above code is just an example, but it should point you in the right direction. 4. Follow edited Nov 17 at 20:42. In PHP 8. I have large amount of data as string which includes text and lots of images. Thank you very much for your help. From PHP 5. In general the compression should take good care of the whitespaces so the gain of the Minify operation should be barely notable in the end. I am including HTML template in my shortcode by using ob_start & ob_get_clean. For example: use function OutputControl\ob_start; use function OutputControl\ob_end_flush; use function OutputControl\ob_get_clean; ob_start (); echo "Hello, world. I also tried v5. Something like this:. This way when you won’t go inside that “if”, you are closing the output buffer which wasn’t started by you. ob_get_clean essentially executes both ob_get_contents and ob_end_clean (). I installed it without composer, do all by instructions. However, like I mentioned, if the webserver is. Hey, no it didn't work Salut, je suis encore en apprentissage de la programmation web notamment avec PHP ou je suis encore novice . 5. ob_start () use. The central point of my comment is that it is not possible - based on that you appear to preclude output buffering in your original post. Using the ob_get_level() function is straightforward. Descrição ¶. 2,268 1 1 gold badge 4 4 silver badges 7 7 bronze badges. The output buffer, on the other hand, will catch all output that takes place after ob_start() including (HTML) output of any warnings or errors you might have in the code before you call ob_get_contents();. ob_get_flush ( ): string|false. Description ¶ ob_get_clean (): string|false Lit le contenu courant du tampon de sortie puis l'efface. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_end_clean () as the buffer contents are discarded when ob_end_clean () is called. Code Examples. Has anyone managed to achieve this? Thanks a lot for any pointers. If you want to capture instead of echoing, you should use ob_get_clean () – kijin. The output buffer must be started by ob_start() with PHP_OUTPUT_HANDLER_CLEANABLE flag. I also want to be able to show the user the XML before hand. htaccess. It should really only give you the 1st one. Improve this answer. Parameters. There is some things I dont get about end_clean, clean, get_clean, etc, and therefore, the answer is going to be different and nuanced from the other one. php: SFWD_CPT_Instance::template_content () Generate output for courses, lessons, topics, quizzes Filter callback for ‘the_content’ (wp core filter)In this article, we will take an in-depth look at the ob_get_level() function and its usage. Provide details and share your research! But avoid. console. Collectives™ on Stack Overflow – Centralized & trusted content around the technologies you use the most. The ob_start() code worked perfectly. mikerojas mikerojas. Yeah, i think i must use ob_get() instead of ob_get_clean() but anyway ob_get() is empty too, i think problem is i cannot call any ob_* inside a function! is this right? – user899205 Aug 30, 2011 at 15:58Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this siteob_start(); starts output buffering to the internal buffer not (screen), then when you add ob_get_contents(); it copy the the output from internal buffer still nothing printed, and when ob_end_clean(); interpreted, it will clear all internal buffer memory, nothing outputed to screen. So the first thing in your script should be ob_start (). Be sure your includes do not already send something to the browser. คำสั่ง ob_start จะเป็นคำสั่งที่บอก PHP ว่าต่อจากนี้ไปอะไรที่ echo ออกมาให้เอาไปเก็บไว้ใน cache ก่อนนะ ส่วนคำสั่ง ob_get_clean เป็นคำสั่งบอกว่า. ob_get_length() gets the size of the buffer, in bytes. ob_get_status() returns status information on either the top level output buffer or all active output buffer levels if full_status is set to true. And for that, you can give him the content like the previous example, or give an url. However, casting to number should ignore regular leading spaces. Learn more about CollectivesThe idea is to not use <?php and ?> tags in the code but rather stand-ins START_PHP and END_PHP, which have no meaning to PHP. Improve this answer. Doesn't prevent ob_end_clean, ob_get_clean or ob_clean calls from being ran. 2) $bild="images/newimage2. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this siteNoted, and I understand that. The ob_start () function is a useful tool for buffering your output in your PHP web application. ob_srtart begins output buffering. 1. (PHP 4 4. Cette fonction vide le tampon de sortie sans l'envoyer au navigateur. Please I need an explanation on. ob_flush ( void ) : void. ob_end_clean() don't work as intended. Q&A for work. ob_end_clean() don't work as intended. If you just want to clean the buffer after starting output buffering with. ob_get_clean()函数是ob_get_contents()和ob_end_clean()的组合。 用法: string|false ob_get_clean(); 参数：它不接受任何参数。 返回值：该函数返回输出缓冲区的内容并结束输出缓冲。如果输出缓冲未激活，则返回false。 范例1：以下是ob_get_clean()函数的简单示例。HEREDOC (<<<) is just another way to write a string data into a variable. The output buffer must be started by ob_start with PHP_OUTPUT_HANDLER_CLEANABLE and. . 4. ob_flush() - Vaciar (enviar) el búfer de salida ob_end_flush() - Volcar (enviar) el búfer de salida y deshabilitar el almacenamiento en el mismo ob_end_clean() - Limpiar (eliminar) el búfer de salida y deshabilitar el almacenamiento en el mismo ＋add a note現在のバッファの中身を取得し、出力バッファを削除します。 ob_get_clean() は、基本的に ob_get_contents() および ob_end_clean() を同時に実行するのと同じです。 出力バッファを開始するときに、 ob_start() で PHP_OUTPUT_HANDLER_CLEANABLE フラグを指定する必要があります。I know that this is an old question but I wanted to write my answer for visual learners. Add a comment | 0 The Problem is, you are replcing tho variables from one source. Its output is rendered to the buffer. thanks I appreciate it more than you know. Si fuera necesario continuar procesando el contenido del búfer, se ha de llamar a ob_get_contents () antes que a ob_end_clean (), ya que el contenido del búfer es desechado cuando se llama a ob_end_clean () . While this is convenient in some situations for generating documents on-the-fly it also exposes a. PHP may be configured to automatically create an output buffer when the script begins, which is why the buffer level may be 1 without calling ob_start (). thanks! – Alexandru Trandafir Catalin Sep 29, 2014 at 7:45Using the output buffer for this is not a very clean solution. Unfortunately, my webhost doesn't have output_buffering. , ob_get_clean() would only return the contents of style. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this siteob_clean (): bool. I've got a problem when looping using foreach() loop and inside of this loop using ob_start() and ob_get_clean(). Understanding ob_start() function in php. Return. The accepted answer's suggestion is to use ob_start (); to start getting output then use ob_get_clean (); to put the output into a variable. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_end_clean () as the buffer contents are discarded when ob_end_clean () is called. this is how I am inlcuding the html template in my shortcode function. 14. This function does not destroy the output buffer like ob_end_clean () does. Otherwise ob_clean () will not work. it will work as you would use ob_start with no. Using output buffering ( ob_start () / ob_get_contents ()) is a valid way of addressing the problem however you need to move the code. it uses flush() and ob_flush() functions. ob_get_clean, only works twice. Using ob_gzhandler and manually echo'ing the buffer. PHP ob_end_clean does not clear buffer. Example #1. Now the way how it is set up now works. So ob_start() is supposed to capture output until another buffer function is called like ob_get_clean(), ob_get_contents(), ob_get_flush(). To do this correctly you should be doing ob_start() after ob_get_clean() because ob_get_clean() gets the current buffer contents and delete the current output buffer. See parameters, return values, examples and user notes. 5. ob_get_length — Return the length of the output buffer. Whats the point of disabling output to later throw all the output at once? Doesn't this use more memory (server side) and slow downloads (client side) since the download starts only after the. Definition and Usage. It seems like MAMP is not performing the function 'ob_get_clean()' correctly. Stacking Output Buffers. return <<<EOT <html> EOT; But I want to split the file into different php files t. ob_get_clean essentially executes both ob_get_contents and ob_end_clean. add_filter('wp_nav_menu_items', 'crunchify_add_login_logout_menu', 10, 2);2. Output Control 함수 목록. The ob_start () function is a useful tool for buffering your output in your PHP web application. ob_get_clean ( ): string|false. If it is greater than zero, php will use the value as boolean true and therefore executes ob_end_clean () what cleans the buffer. The ob_clean () function is a useful tool for clearing the output buffer in your PHP web application. exe. Why is ob_get_contents not working. 得到当前缓冲区的内容并删除当前输出缓冲区。 ob_get_clean() 实质上是一起执行了 ob_get_contents() 和 ob_end_clean() 。 输出缓冲区必须由带有 PHP_OUTPUT_HANDLER_CLEANABLE 和 PHP_OUTPUT_HANDLER_REMOVABLE flag 的 ob_start() 启动。 否则 ob_get_clean() 将不起作用。Am using the code below to download a file. . But you also need to end and retrieve the contents of the buffer as well. Tôi có 1 ví dụ đơn giản như sau: New search experience powered by AI. 3. I need to re-populate mini-cart when product added via ajax add to cart. Two problems. While output buffering is active no output is sent from the script (other than headers), instead the output is stored in an internal buffer. For the OP's purposes, it's probably fine, but ob_get_clean() ends output buffering while ob_get_contents() and ob_clean() do not. See the syntax, return value, and examples of this function in PHP. Có nhiều lợi ích khi sử dụng ob_start trong PHP, bao gồm: Giảm tải server: ob_start có thể giúp giảm tải server bằng cách lưu trữ toàn bộ dữ liệu đầu ra trong bộ đệm (buffer) trước khi gửi nó đến trình duyệt. Here's my function:The ob_get_contents () function has different return behaivor in PHP 5. (Necessitating ob_clean() as a further workaround. ob_get_clean returns a string of whatever has entered the output buffer since your ob_start () call and then deletes the contents from the buffer (in this particular example you never set the output of this function to anything, so your code should do nothing). 3. The ob_flush () function outputs the contents of the topmost output buffer and then clears the buffer of the contents. See the syntax, return value, and examples of this function in PHP. This function does not destroy the output buffer like ob_end_flush. You're getting the warning because your script is outputting code before the page headers are sent - meaning you're printing output before the html page. It would be better to place all your output in the included file in a function that stores everything in a variable that is returned by the function.