php man page for strlen

STRLEN(3)								 1								 STRLEN(3)

strlen - Get string length

SYNOPSIS
       int strlen (string  $string)

DESCRIPTION
	Returns the length of the given $string.

PARAMETERS
	      o $string
		- The string being measured for length.

RETURN VALUES
	The length of the $string on success, and 0 if the $string is empty.

CHANGELOG
       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  Prior  versions  treated  arrays  as  the string |
       |	| Array, thus returning a string length  of  5	and |
       |	| emitting an E_NOTICE level error.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES
       Example #1

	      A strlen(3) example

	      <?php
	      $str = 'abcdef';
	      echo strlen($str); // 6

	      $str = ' ab cd ';
	      echo strlen($str); // 7
	      ?>

NOTES
       Note

	      strlen(3) returns the number of bytes rather than the number of characters in a string.

       Note

	      strlen(3) returns NULL when executed on arrays, and an E_WARNING level error is emitted.

SEE ALSO
       count(3), grapheme_strlen(3), iconv_strlen(3), mb_strlen(3).

PHP Documentation Group 														 STRLEN(3)