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<?php $simpsons = array(); $simpsons[0] = array("name"=>"Abe","parent"=>-1); $simpsons[1] = array("name"=>"Homer","parent"=>0); // Homer's parent is Abe $simpsons[2] = array("name"=>"Bart","parent"=>1); // Bart's parent is Homer $simpsons[3] = array("name"=>"Lisa","parent"=>1); // Lisa's parent is Homer $simpsons[4] = array("name"=>"Maggie","parent"=>1); // Maggie's parent is Homer function get_children($simpsons, $parent) { foreach ($simpsons as $index=>$onesimpson) { if ($onesimpson["parent"]==$parent) { echo "$onesimpson[name] is a child of ".$simpsons[$parent]["name"].".<br />\n"; get_children($index); } } } get_children($simpsons, 0); ?>
Output for 7.1.0
Homer is a child of Abe.<br /> Fatal error: Uncaught ArgumentCountError: Too few arguments to function get_children(), 1 passed in /in/kFFCg on line 14 and exactly 2 expected in /in/kFFCg:10 Stack trace: #0 /in/kFFCg(14): get_children(1) #1 /in/kFFCg(19): get_children(Array, 0) #2 {main} thrown in /in/kFFCg on line 10
Process exited with code 255.
Output for 5.1.0 - 5.6.28, 7.0.0 - 7.0.14
Homer is a child of Abe.<br /> Warning: Missing argument 2 for get_children(), called in /in/kFFCg on line 14 and defined in /in/kFFCg on line 10 Warning: Invalid argument supplied for foreach() in /in/kFFCg on line 11
Output for hhvm-3.10.0 - 3.12.0
Homer is a child of Abe.<br /> Warning: get_children() expects exactly 2 parameters, 1 given in /in/kFFCg on line 16 Warning: Invalid argument supplied for foreach() in /in/kFFCg on line 16
Output for 4.3.0 - 4.3.10, 4.4.0 - 5.0.5
Homer is a child of Abe.<br /> Warning: Missing argument 2 for get_children() in /in/kFFCg on line 10 Warning: Invalid argument supplied for foreach() in /in/kFFCg on line 11
Output for 4.3.11
Homer is a child of Abe.<br /> Warning: Missing argument 2 for get_children() in /in/kFFCg on line 10