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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==$n[0]**2+3*$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/9ZKqC:5 Stack trace: #0 /in/9ZKqC(8): isPerfect(Array) #1 {main} thrown in /in/9ZKqC on line 5
Process exited with code 255.

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