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<?php $start = 6; $list = [ '1楼', '2楼', '3楼', '4楼', '5楼', ]; $list = array_flip( array_map( array_flip($list), function($key){ return $start+(int)$key; } ) );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, array callback must have exactly two members in /in/gmOqO:8 Stack trace: #0 /in/gmOqO(8): array_map(Array, Object(Closure)) #1 {main} thrown in /in/gmOqO on line 8
Process exited with code 255.

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