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run code in 150+ php & hhvm versions
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<?php $strselvaluelist = '4|2'; if(!empty($strselvaluelist)){ echo 0; if(strstr("4", $strselvaluelist)){ echo 1; if(!strstr("17", $strselvaluelist)){ $strselvaluelist.='|17'; echo 2; } } } var_dump($strselvaluelist);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
0string(3) "4|2"