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<?php
function versioncmp($version1, $version2){
//Returns 0 if two versions are equal.
//Returns -1 if $version1 is less than $version2
//Returns 1 if $version1 is greater than $version2
//See strcmp
//NOTE: Does not handle "Beta", "RC", or any other non-numeric version
//designation.
$parts1 = explode('.', $version1);
$parts2 = explode('.', $version2);
$result = 0;
while (!$result && list(,$v1) = each($parts1) && list(,$v2) = each($parts2)){
if ($v1 < $v2){
$result = -1;
}
elseif ($v1 > $v2){
$result = 1;
}
}
return $result;
}
?>
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Usage Example
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echo versioncmp('4.0.1', '3.0.16');
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