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run code in 150+ php & hhvm versions
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<?php echo preg_replace_callback( '#\d+#', 'incr', '123abc456def789' ); function incr($args){ var_dump($args); }
based on pml9P
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(3) "123" } array(1) { [0]=> string(3) "456" } array(1) { [0]=> string(3) "789" } abcdef