TYPO3 Core

$numbers = t3lib_div::trimExplode(',', $this->calculateFunctions($string));

/**

* Calculates special functions:

* + max([10.h], [20.h]) -> gets the maximum of the given values

*

* @param string $string: The raw string with functions to be calculated

* @return string The calculated values

*/

protected function calculateFunctions($string) {

if (preg_match_all('#max\(([^)]+)\)#', $string, $matches)) {

foreach ($matches[1] as $index => $maxExpression) {

$string = str_replace(

$matches[0][$index],

$this->calculateMaximum(

$maxExpression

),

$string

);

}

}

return $string;

}

/**

* Calculates the maximum of a set of values defined like "[10.h],[20.h],1000"

*

* @param string $string: The string to be used to calculate the maximum (e.g. "[10.h],[20.h],1000")

* @return integer The maxium value of the given comma separated and calculated values

*/

protected function calculateMaximum($string) {

$parts = t3lib_div::trimExplode(',', $this->calcOffset($string), true);

$maximum = (count($parts) ? max($parts) : 0);

return $maximum;

}