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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$arr = [1=>"A", 2 => "B", 6 => "Z"];
$un = ["G", "H", "I"];
$length = count($arr) + count($un);
for ($i = 0; $i <= $length; $i++) {
if (!array_key_exists($i, $arr)) $arr[$i] = array_pop($un);
}
var_dump($arr);