Question

How to find the position and first different character between two strings in PHP

Answer 1

$s1 = 'php java';
$s2 = 'php c++';
$pos = strspn($s1 ^ $s2, "\0");

echo "position $pos: characters: $s1[$pos] and $s2[$pos]";

  
/*
run:
       
position 4: characters: j and c
      
*/

 

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Answer 2

function get_first_different_character($s1, $s2, $encoding = 'UTF-8') {
    return mb_strlen(
            mb_strcut($s1, 0, strspn($s1 ^ $s2, "\0"), $encoding), $encoding
           );
}

$s1 = 'php java';
$s2 = 'php c++';

$pos = get_first_different_character($s1, $s2);

echo "position $pos: characters: $s1[$pos] and $s2[$pos]";

  
/*
run:
       
position 4: characters: j and c
      
*/

 

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