strlen() php function giving the wrong length of unicode characters ?

To get the correct length, use mb_strlen() for Unicode characters.

The PHP code is as follows −

Example

 Live Demo

<?php
   $unicodeValues = 'JohnSm?th';
   echo "The string length with mb_strlen=",mb_strlen($unicodeValues, 'utf8');
   echo "
";
   echo "The string length with strlen=",strlen($unicodeValues);
?>

Output

The string length with mb_strlen=9
The string length with strlen=10