/**
* Common function used to compare two Geeklog version numbers
*
* @param string $version1 First version number to be compared
* @param string $version2 Second version number to be sompared
* @param string $operator optional string to define how the two versions are to be compared
* valid operators are: <, lt, <=, le, >, gt, >=, ge, ==, =, eq, !=, <>, ne
* @return mixed By default, returns -1 if the first version is lower than the second,
* 0 if they are equal, and 1 if the second is lower.
* When using the optional operator argument, the function will return TRUE
* if the relationship is the one specified by the operator, FALSE otherwise.
*/
function COM_versionCompare($version1, $version2, $operator = '')
{
// Convert Geeklog version numbers to a ones that can be parsed
// by PHP's "version_compare"
$version1 = COM_versionConvert($version1);
$version2 = COM_versionConvert($version2);
// All that there should be left at this point is numbers and dots,
// so PHP's built-in function can now take over.
if (empty($operator)) {
return version_compare($version1, $version2);
} else {
return version_compare($version1, $version2, $operator);
}
}
/**
* Checks if a string could be a valid geeklog version
*
* @param string $version Geeklog version number that is being checked
* @return bool true/false
*
*/
function isValidVersion($version = '')
{
$valid = true;
// some minimal parameter filtering ...
$v = explode('.', $version);
if (count($v) != 3 || !is_numeric($v[0]) || !is_numeric($v[1])) {
$valid = false;
} else {
$v = COM_versionConvert($version);
$v = explode('.', $v);
foreach ($v as $key => $value) {
if (!is_numeric($value)) {
$valid = false;
break;
}
}
}
return $valid;
}
