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run code in 300+ PHP versions simultaneously
<?php echo substr('abcdef', -1); // bcdef echo substr('abcdef', 1, 3); // bcd echo substr('abcdef', 0, 4); // abcd echo substr('abcdef', 0, 8); // abcdef echo substr('abcdef', -1, 1); // f
Output for git.master, git.master_jit, rfc.property-hooks
fbcdabcdabcdeff

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