ob_clean — Clean (erase) the output buffer
Description of ob_clean in php
ob_clean(): bool
This function discards the contents of the output buffer.
Example ob_clean
<?php
// require some external library files
require ("lib/somelibrary.php");
require ("lib/class/someclass.php");
// clean the output buffer
ob_clean();
// simple test image
header("Content-type: image/gif");
$im = imagecreate (100, 50);
imagegif($im);
imagedestroy($im);
?>