3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo (int)'-9999999999999999999999999999999999999999'; echo "\n"; echo (int)'9999999999999999999999999999999999999999';
Output for git.master, git.master_jit, rfc.property-hooks
-9223372036854775808 9223372036854775807

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