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@ 2018-04-05T19:53:28Z

<?php

$arrayIn = [
     [ 0 => "3",
       1 => "12345"
     ],
     [ 0 => "2",
       1 => "123"
     ]
];
$arrayOut = [];
foreach ($arrayIn as $arr) {
	$arrayOut[$arr[1]] = $arr[0];
}
var_dump($arrayOut);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

25.09 ms | 404 KiB | 5 Q