Let's say you have a php array filled with dictionaries/associative arrays of first and last names, like so:
$userList = array(array('first'=>'Jim', 'last'=>'Kirk'), array('first'=>'George', 'last'=>'Bush'));
/*
$userList now looks like
{
{
first => Jim,
last => Kirk
},
{
first => George,
last => Bush
}
}
*/
How do I tell php to "Remove elements from $userList as $users where $user['first'] === 'George'"?
foreach and use a reference & to be able to modify / unset that array element:
foreach($userList as &$user) {
if($user['first'] == 'George') {
unset($user);
}
}
foreach. Just saw your answer (WOW), can't say that I would build a function to return a closure and run it through array_filter. Actually, I can say, I wouldn't.Here's how I did it (based on "Charles"'s answer from This Question)...
First, I created a function-factory:
function createNotNamedFunction($first)
{
return function($user) use($first) {
return $user['first'] !== $first;
};
}
Then, I call it when I need to filter the array:
$first = 'George';
$notNamed = self::createNotNamedFunction($first);
$filteredUsers = array_filter($userList, $notNamed);
Short, simple to understand, extensible (the test can be arbitrarily complex since it's a first-class function), and doesn't involve loops.
This technique uses closures, array_filter, and only works in PHP 5.3 or greater, but it's what I would consider the canonical answer. It turns out that array_filter is "remove from array where" when you provide it with an arbitrary test.
Thanks to all world-class php wizards who contributed alternative patterns!
removeByWherein my answer, you can try to use it.