Merge two indexed arrays of indexed arrays based on first column value

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You can use the PHP function array_merge_recursive.
See the example:

<?php
$ar1 = array("color" => array("favorite" => "red"), 5);
$ar2 = array(10, "color" => array("favorite" => "green", "blue"));
$result = array_merge_recursive($ar1, $ar2);
print_r($result);
?>

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