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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$collection = collect([
collect(['a','b','c','d']),
collect(['b','c','d','e']),
collect(['c','d','e','f'])
]);
var_export(
$collection->reduce(fn($result, $row) => $result->intersect($row), $collection->first())
);