/**
* Returns the amount of memory available to PHP, minus the amount
* currently being used, in bytes.
*
* @param boolean $realUsage
* @param boolean $forceLimitCheck
* @return int
*/
public static function getAvailableMemory($realUsage = false, $forceLimitCheck = false)
{
if (!self::$_memLimit || $forceLimitCheck) {
$iniVal = ini_get('memory_limit');
if ($iniVal == '-1') {
/* Default to a gig, though this does mean that this method
could return a negative number. */
self::$_memLimit = pow(1024, 3);
} elseif (ctype_digit($iniVal)) {
self::$_memLimit = (int) $iniVal;
} else {
$lastChar = strtolower(substr($iniVal, -1));
$intPortion = (int) substr($iniVal, 0, strlen($iniVal) - 1);
if ($lastChar == 'k') {
$multiplier = 1024;
} elseif ($lastChar == 'm') {
$multiplier = pow(1024, 2);
} elseif ($lastChar == 'g') {
$multiplier = pow(1024, 3);
} else {
// Shouldn't happen
return false;
}
self::$_memLimit = $intPortion * $multiplier;
}
}
return self::$_memLimit - memory_get_usage($realUsage);
}
