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run code in 300+ PHP versions simultaneously
<?php echo PHP_INT_SIZE;
Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.26, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 7.3.27, 7.4.0 - 7.4.15, 8.0.0 - 8.0.3
8
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
Notice: Use of undefined constant PHP_INT_SIZE - assumed 'PHP_INT_SIZE' in /in/a8KaY on line 3 PHP_INT_SIZE