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run code in 150+ php & hhvm versions
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<?php $str1 = 'football'; $str2 = 'footboll'; $str_pos = strspn($str1 ^ $str2, "\0"); printf('First difference between two strungs at position %d: "%s" vs "%s"', $str_pos, $str1[$str_pos], $str2[$str_pos] ); ?>
Output for 4.3.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
First difference between two strungs at position 5: "a" vs "o"
Output for 4.3.0 - 4.3.1
Notice: Uninitialized string offset: 8 in /in/PCijN on line 6 Notice: Uninitialized string offset: 8 in /in/PCijN on line 7 First difference between two strungs at position 8: "" vs ""