array_filter preserve keys

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<?php
$a = ["foo", "bar"];
$b = array_filter($a, function($item) {
    return $item[0] == "f";
});
$c = array_filter($a, function($item) {
    return $item[0] == "b";
});
 
 
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Owner	Petter Rasmussen
Created	8 years ago
Modified	8 years ago
Visibility	Public