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<?php function isPerfect($n) { return count($a)==4&$n[0]*$n[1]*$n[2]*$n[3]+1==pow(pow($n[0],2)+3*$n[0]+1,2); } var_dump(isPerfect([1,2,3,4])); var_dump(isPerfect(['1','2','3','4'])); var_dump(isPerfect([3,9,5,6])); var_dump(isPerfect([1,2,3,4,5])); var_dump(isPerfect(['a','b','c','d'])); var_dump(isPerfect([1,'b',3,4])); var_dump(isPerfect([1001,1002,1003,1004]));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $a in /in/4LLYN on line 4 Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /in/4LLYN:4 Stack trace: #0 /in/4LLYN(7): isPerfect(Array) #1 {main} thrown in /in/4LLYN on line 4
Process exited with code 255.

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