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<?php function some_function($a, $b) { $result = ''; $len = strlen($a) > strlen($b) ? strlen($b) : strlen($a); for($i=0; $i<$len; $i++) { if(substr($a, $i, 1) == substr($b, $i, 1)) { $result .= substr($a, $i, 1); } else { break; } } return $result; } $a = 'Metric Bob Foundation A5, Lined, Pink & Orange'; $b = 'Metric Bob Foundation A5, Lined, Navy & Green'; echo some_function($a, $b);
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