3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class Tree { public $i; public $l; public $r; public function __construct($item, $depth) { $this->i = $item; if($depth) { $this->l = new Tree($item * 2 - 1, --$depth); $this->r = new Tree($item * 2, $depth); } } public function check() { return $this->i + ($this->l->l === null ? $this->l->check() : $this->l->i) - ($this->r->l === null ? $this->r->check() : $this->r->i); } } $minDepth = 4; $n = $argc == 2 ? $argv[1] : 1; $maxDepth = $minDepth + 2 > $n ? $minDepth + 2 : $n; $stretchDepth = $maxDepth + 1; $stretch = new Tree(0, $stretchDepth); printf("stretch tree of depth %d\t check: %d\n", $stretchDepth, $stretch->check()); unset($stretch); $longLivedTree = new Tree(0, $maxDepth); $iterations = 1 << $maxDepth; do { $check = 0; for($i = 1; $i <= $iterations; ++$i) { $check += (new Tree($i, $minDepth))->check() + (new Tree(-$i, $minDepth))->check(); } printf("%d\t trees of depth %d\t check: %d\n", $iterations<<1, $minDepth, $check); $minDepth += 2; $iterations >>= 2; } while($minDepth <= $maxDepth); printf("long lived tree of depth %d\t check: %d\n", $maxDepth, $longLivedTree->check());
based on m0Uuq
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
stretch tree of depth 7 check: -1 128 trees of depth 4 check: -128 32 trees of depth 6 check: -32 long lived tree of depth 6 check: -1
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/02War on line 42
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/02War on line 42
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/02War on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/02War on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/02War on line 4
Process exited with code 255.