strlen

Returns the length of the given string.

The string being measured for length.

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

Prior versions treated arrays as the string Array, thus returning a string length of 5 and emitting an E_NOTICE level error.

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

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

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

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

count() -

grapheme_strlen() -

iconv_strlen() -

mb_strlen() -