array_filter preserve keys
1234567891011121314151617
<?php
$a = ["foo", "bar"];
$b = array_filter($a, function($item) {
return $item[0] == "f";
});
$c = array_filter($a, function($item) {
return $item[0] == "b";
});
echo json_encode($a, JSON_PRETTY_PRINT);
echo "\n\n";
echo json_encode($b, JSON_PRETTY_PRINT);
echo "\n\n";
echo json_encode($c, JSON_PRETTY_PRINT);
Php
INFO