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run code in 150+ php & hhvm versions
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<?php gc_enable(); class test { public $spl; public function __construct() { $this->spl = new SplPriorityQueue(); $this->spl->insert($this, 1); } } $i = 0; while($i < 50000) { $test = new test(); unset($test); gc_collect_cycles(); echo sprintf('%1$04d: ', $i) . number_format(memory_get_usage()) . " B\n"; $i++; }