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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$collection = collect([
"CASSETE_1" => "500",
"CASSETE_2" => "500",
"CASSETE_3" => "100",
"CASSETE_4" => "100",
]);
var_export(
$collection->mapToGroups(fn($amt, $cassete) => [$amt => $cassete])
->mapWithKeys(fn($cassetes, $amt) => [$cassetes->implode(' / ') => $amt])
->toArray()
);