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<?php $input = array ( 'Ford Mustang' => '125134', 'Formula 1' => '101499', 'Sconti Auto' => '98331', ); echo implode(', ', array_map(function ($entry) { return key($entry); }, $input));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, string given in /in/svvCD:9 Stack trace: #0 /in/svvCD(9): key('125134') #1 [internal function]: {closure}('125134') #2 /in/svvCD(8): array_map(Object(Closure), Array) #3 {main} thrown in /in/svvCD on line 9
Process exited with code 255.

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