Compare two strings in PHP to find the first example of a different character position

  This is a problem on the StackOverflow. gives two strings of equal length, finding the first different character position in the two strings.

The general practice is this: the     code is as follows: <?php for ($offset = 0; $offset < $length; + + $offset) {    if ($str 1[$offs ET]!== $str 2[$offset]) {        return $offset    }} The best answer given below is a different or an operator (^) that has never been used before. Operators, do not know where to use, today is learned.   Because in general, when you vary or manipulate two strings, the same character's XOR or result is null (""), so we just need to find the first non-null ("") character.     Code as follows: <?php $position = strspn ($string 1 ^ $string 2, ""); Obviously this is a more elegant and efficient method. In addition, the answering person also attaches a multibyte character solution. The code is as follows: <?php function getcharacteroffsetofdifference ($str 1, $str 2, $encoding = ' UTF-8 ') {    return Mb_strlen ($str 1, $encoding)            -Mb_strlen (                 mb_strcut (                      $STR 1,     & nbsp                STRSPN ($str 1 ^ $str 2, ""),           &NBSP ;          mb_stRlen ($str 1, ' 8bit '),                       $encoding     & nbsp            ,                   $encoding              ); }