Quines are self-reproducing programmes. Here are two in PHP I just wrote:
CLI version:
<?php $a=’<?php $a=%c%s%c;printf($a,39,$a,39);?>’;printf($a,39,$a,39);?>
WEB version:
<?php $a=’<?php $a=%c%s%c;printf($a,39,htmlspecialchars($a),39);?>’;printf($a,39,htmlspecialchars($a),39);?>
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