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run code in 200+ php & hhvm versions
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<?php echo preg_replace(array('/#{(\S*)}/', '/#{(\S*)( (\S*))?}/'), array('<?=$1?>', '<?=$1($3)?>'), "#{abc }");
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.1.10
<?=abc()?>