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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$a = [
["id" => "123", "label" => "l1"],
["id" => "321", "label" => "l3"]
];
$res = array_combine(
array_column($a, 'id'),
array_column($a, 'label')
);
var_export($res);