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<?php $promos = [ '123' => ['weight' => 1], '234' => ['weight' => 3], '345' => ['weight' => 2], ]; var_dump(array_column($promos, 'weight', $promos));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_column(): Argument #3 ($index_key) must be of type string|int|null, array given in /in/l7NcV:9 Stack trace: #0 /in/l7NcV(9): array_column(Array, 'weight', Array) #1 {main} thrown in /in/l7NcV on line 9
Process exited with code 255.

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