3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php 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([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]));
based on 4LLYN
Output for 7.1.0 - 7.2.0
int(1) int(1) int(0) int(0) Warning: A non-numeric value encountered in /in/3DBSt on line 4 Warning: A non-numeric value encountered in /in/3DBSt on line 4 Warning: A non-numeric value encountered in /in/3DBSt on line 4 Warning: A non-numeric value encountered in /in/3DBSt on line 4 Warning: A non-numeric value encountered in /in/3DBSt on line 4 Warning: A non-numeric value encountered in /in/3DBSt on line 4 int(1) Warning: A non-numeric value encountered in /in/3DBSt on line 4 int(0) int(1)
Output for 5.4.0 - 7.0.20
int(1) int(1) int(0) int(0) int(1) int(0) int(1)