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PHP: Summary of output buffer processing function usage

伊谢尔伦

Release： 2023-03-11 10:10:01

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The function of the output buffer processing function is somewhat similar to the C stack, which is temporarily placed in a storage space to process the content.

The output buffer functions are:

ob_start() - Open the output control buffer
ob_get_length() - Returns the length of the output buffer
##ob_get_level () - Returns the nesting level of the output buffer
ob_get_status() - Returns the status of the output buffer (returned as an array, The top level is returned by default, and all are returned when the parameter is true)
ob_get_contents() - Returns the contents of the output buffer
ob_get_clean() - Returns the current output buffer in string format and closes output buffering
ob_end_clean () - Flushes (erases) the buffer and closes the output buffer
ob_get_flush() - Returns the output buffer contents as a string and closes the buffer
ob_end_flush() - Flush out (send out) the output buffer contents buffer

The example is as follows:

<?php  
 define(&#39;APP_ROOT&#39;, dirname(FILE));
 $file = &#39;/templates/html/error_config.html&#39;;
 ob_start(); 
 include(APP_ROOT.$file);
 ob_end_flush();
   //$contents = ob_get_contents();  这样可以将输出保存，可以作进一步处理
 　//ob_end_clean();
   //echo $contents;
 ?>

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<?php echo"<?xml version=\"1.0\" encoding=\"utf-8\">"; ?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD  XHTML 1.0  Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
     <meta http-equiv="Content-Script-Type" content="text/javascript" />
     <meta http-equiv="Content-Style-Type" content="text/css" />
     <title>Error</title>
 </head>
 <body onload="doRedirect()">
 <h1>Error</h1>
 <div style="position:absolute;top:150px;text-align:center;width:95%;">
     <p style="margin:12pt;"><strong>config.php</strong> does not exist or is not readable by the webserver in the directory.</p>
     <p style="margin:12pt;"><?php echo CommonFunctions::$PSI_VERSION_STRING ?></p>
 </div>
 </body>
 </html>

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The output result is as follows:

config.php does not exist or is not readable by the webserver in the phpsysinfo directory.

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