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Find array with specific key php

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php find key in array 

<?php
$search_array = array('first' => 1, 'second' => 4);
if (array_key_exists('first', $search_array)) {
    echo "The 'first' element is in the array";
}
?>
1
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get specific key value from array php 

$ids = array_column($users, 'id');

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