How to flatten array in PHP?
In PHP 5.5 you have array_column:
$plucked = array_column($yourArray, 'email');Otherwise, go with array_map:
$plucked = array_map(function($item){ return $item['email'];}, $yourArray);
You can use a RecursiveArrayIterator . This can flatten up even multi-nested arrays.
<?php$arr1=array(0=> array("email"=>"test01@testmail.com"),1=>array("email"=>"test02@testmail.com"),2=> array("email"=>"test03@testmail.com"), 3=>array("email"=>"test04@testmail.com"));echo "<pre>";$iter = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr1));$new_arr = array();foreach($iter as $v) { $new_arr[]=$v;}print_r($new_arr);OUTPUT:
Array( [0] => test01@testmail.com [1] => test02@testmail.com [2] => test03@testmail.com [3] => test04@testmail.com)