php man page for ob_get_length

OB_GET_LENGTH(3)							 1							  OB_GET_LENGTH(3)

ob_get_length - Return the length of the output buffer

SYNOPSIS
       int ob_get_length (void	)

DESCRIPTION
	This will return the length of the contents in the output buffer, in bytes.

RETURN VALUES
	Returns the length of the output buffer contents, in bytes, or FALSE if no buffering is active.

EXAMPLES
       Example #1

	      A simple ob_get_length(3) example

	      <?php

	      ob_start();

	      echo "Hello ";

	      $len1 = ob_get_length();

	      echo "World";

	      $len2 = ob_get_length();

	      ob_end_clean();

	      echo $len1 . ", ." . $len2;
	      ?>

	      The above example will output:

	      6, 11

SEE ALSO
       ob_start(3), ob_get_contents(3).

PHP Documentation Group 													  OB_GET_LENGTH(3)