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<?php if (!defined('PHP_INT_MAX')) { $min = -1; do { $last = $min; $min <<= 1; } while($min < 0); define('PHP_INT_MIN', $last); define('PHP_INT_MAX', ~$last); } class Foo { var $id; function Foo() { static $counter = 0; $this->id = $counter++; if ($counter > PHP_INT_MAX) { $counter = PHP_INT_MIN; } } } $i1 = new Foo; var_dump($i1->id); $i2 = new Foo; var_dump($i2->id); $i3 = new Foo; var_dump($i3->id); $i4 = new Foo; var_dump($i4->id);
Output for git.master, git.master_jit, rfc.property-hooks
NULL NULL NULL NULL

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