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<?php $array = [ 'PHP', 'Arrays', 'Funções', ]; function hashtag($x){ return "#".$x; } $y = array_map(function ($v, $k){ return "#".$v.$k; }, $array); print_r($y);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/98hLS:12 Stack trace: #0 [internal function]: {closure}('PHP') #1 /in/98hLS(12): array_map(Object(Closure), Array) #2 {main} thrown in /in/98hLS on line 12
Process exited with code 255.

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