How can i pass a single additional argument to array_map
callback? In my example i'd like to pass $smsPattern
(as a second argument, after current element in $featureNames
) to the function array_map
with $getLimit
closure:
$features = $usage->getSubscription()->getUser()->getRoles();
// SMS regular expression in the form of ROLE_SEND_SMS_X
$smsPattern = '/^ROLE_SEND_SMS_(?P<l>\d+)$/i';
// Function to get roles names and X from a role name
$getNames = function($r) { return trim($r->getRole()); };
$getLimit = function($name, $pattern) {
if(preg_match($pattern, $name, $m)) return $m['l'];
};
// Get roles names and their limits ignoring null values with array_filter
$featuresNames = array_map($getNames, $features);
$smsLimits = array_filter(array_map($getLimit, $featureNames, $smsPattern));
With this code i'm getting a weird warning:
Warning: array_map() [function.array-map]: Argument #3 should be an array.
Of course di reason is for reusing $getLimit
closure with another regular expression like $smsPattern
. Thanks.
This is exactly what closures are about:
$getLimit = function($name) use ($smsPattern) {
if(preg_match($smsPattern, $name, $m)) return $m['l'];
};
$smsLimits = array_filter(array_map($getLimit, $features));
If you want to generalize it to other patterns, wrap the function creation into another function:
function patternMatcher($pattern) {
return function($name) use ($pattern) {
if(preg_match($pattern, $name, $m)) return $m['l'];
};
}
$getLimit = patternMatcher($smsPattern);
$smsLimits = array_filter(array_map($getLimit, $features));
And here it is wrapped up as an anonymous function:
$patternMatcher = function($pattern) {
return function($name) use ($pattern) {
if(preg_match($pattern, $name, $m)) return $m['l'];
};
};
$smsLimits = array_filter(array_map($patternMatcher($smsPattern), $features));