note 89416 modified in function.version-compare by danbrown

Since this function considers 1 < 1.0 < 1.0.0, others might find this function useful (which considers 1 == 1.0): <?php //Compare two sets of versions, where major/minor/etc. releases are separated by dots. //Returns 0 if both are equal, 1 if A > B, and -1 if B < A. function version_compare2($a, $b) { $a = explode(".", rtrim($a, ".0")); //Split version into pieces and remove trailing .0 $b = explode(".", rtrim($b, ".0")); //Split version into pieces and remove trailing .0 foreach ($a as $depth => $aVal) { //Iterate over each piece of A if (isset($b[$depth])) { //If B matches A to this depth, compare the values if ($aVal > $b[$depth]) return 1; //Return A > B else if ($aVal < $b[$depth]) return -1; //Return B > A //An equal result is inconclusive at this point } else { //If B does not match A to this depth, then A comes after B in sort order return 1; //so return A > B } } //At this point, we know that to the depth that A and B extend to, they are equivalent. //Either the loop ended because A is shorter than B, or both are equal. return (count($a) < count($b)) ? -1 : 0; } ?> --was-- Since this function considers 1 < 1.0 < 1.0.0, others might find this function useful (which considers 1 == 1.0): //Compare two sets of versions, where major/minor/etc. releases are separated by dots. //Returns 0 if both are equal, 1 if A > B, and -1 if B < A. function version_compare2($a, $b) { $a = explode(".", rtrim($a, ".0")); //Split version into pieces and remove trailing .0 $b = explode(".", rtrim($b, ".0")); //Split version into pieces and remove trailing .0 foreach ($a as $depth => $aVal) { //Iterate over each piece of A if (isset($b[$depth])) { //If B matches A to this depth, compare the values if ($aVal > $b[$depth]) return 1; //Return A > B else if ($aVal < $b[$depth]) return -1; //Return B > A //An equal result is inconclusive at this point } else { //If B does not match A to this depth, then A comes after B in sort order return 1; //so return A > B } } //At this point, we know that to the depth that A and B extend to, they are equivalent. //Either the loop ended because A is shorter than B, or both are equal. return (count($a) < count($b)) ? -1 : 0; } http://php.net/manual/en/function.version-compare.php