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@ 2021-02-22T09:44:10Z

<?php

$arr1 = array(
    array(0 => "1", 1 => "1"),
    array(0 => "2", 1 => "2"),
);
$arr2 = array(
    array(0 => "a", 1 => "b"),
    array(0 => "c", 1 => "d"),
);

$result = [];

foreach($arr1 as $key=>$value){
   $result[array_unique($value)[0]] = $arr2[$key];
}

print_r($result);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_unique: documentation ( source)

preferences:dark modelive previewkey bindings

108.97 ms | 405 KiB | 5 Q