[Solved] Write array formatted to file

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If you create the variable in config.php then it is loaded when you include the file in index.php like this:

config.php 

<?php
$config = [
    'key1' => 'value1',
    'key2' => [
        'subkey1' => 'value3'
     ],
     'key3' => 'value4'
];
?>

index.php 

include "config.php";
$value4 = $config['key3']; // 'value4'

made some assumptions because your question had very little information, hopefully this helps!

solved Write array formatted to file