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<?php declare(strict_types=1); function isPerfect($n) { return count($n)==4&&$n[0]*$n[1]*$n[2]*$n[3]+1==pow(pow($n[0],2)+3*$n[0]+1,2); } var_dump(isPerfect(['a','b','c','d']));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: Unsupported operand types: string * string in /in/m7Gn5:5 Stack trace: #0 /in/m7Gn5(8): isPerfect(Array) #1 {main} thrown in /in/m7Gn5 on line 5
Process exited with code 255.

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