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run code in 300+ PHP versions simultaneously
<?php $x = '0w95'; print "$x\n"; for ($i=0; $i<20; $i++){ $x++; print "$x\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
0w95 0w96 0w97 0w98 0w99 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x10 0x11 0x12 0x13 0x14 0x15

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