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<?php function getIntersection ($str1,$str2) { //get the min length of str1 & str2 $l = strlen($str1) <= strlen($str2)? strlen($str1):strlen($str2); $intersection = ""; //substring length $i = 0; while($i < $l && (substr($str1,0,$i) == substr($str2,0,$i) )) { $i++; } return substr($str1,0,$i-1); } $a = 'Metric Bob Foundation A5, Lined,sdf Pink & Orange'; $b = 'Metric Bob Foundation A5, Lined, Navy & Green'; echo getIntersection ($a, $b);
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