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run code in 300+ PHP versions simultaneously
<?php if(isset($_POST)){ $a=$_POST['a']; echo $a; } echo '<form method="post" action=""><input type="text name="a"/><input type="submit" name="ok"/></form>';
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "a" in /in/voeoS on line 3 <form method="post" action=""><input type="text name="a"/><input type="submit" name="ok"/></form>

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