3v4l.org

run code in 300+ PHP versions simultaneously
<?php $i = ord('a'); do { echo $i . " - " . chr($i) . "\n"; } while ($i++ < ord('f') + 1 );
Output for git.master, git.master_jit, rfc.property-hooks
97 - a 98 - b 99 - c 100 - d 101 - e 102 - f 103 - g

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