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<?php $items = [ 'a' => [], 'b' => ['id' => 'B'], 'c' => ['id' => 'C'], 'd' => [], 'e' => ['id' => 'E'], ]; var_export( array_filter( array_combine( array_keys($items), array_column($items, 'id'))));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ValueError: array_combine(): Argument #1 ($keys) and argument #2 ($values) must have the same number of elements in /in/im2gZ:12 Stack trace: #0 /in/im2gZ(12): array_combine(Array, Array) #1 {main} thrown in /in/im2gZ on line 12
Process exited with code 255.

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