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<?php $s= "123 '".$_POST['nonexisting']."'"; $k = "123 '$foo[nonexisting]'"; echo $s;
Output for git.master, git.master_jit
Warning: Undefined array key "nonexisting" in /in/EhEgd on line 2 Warning: Undefined variable $foo in /in/EhEgd on line 3 Warning: Trying to access array offset on value of type null in /in/EhEgd on line 3 123 ''
Output for rfc.property-hooks
Warning: Undefined array key "nonexisting" in /in/EhEgd on line 2 Warning: Undefined variable $foo in /in/EhEgd on line 3 Warning: Trying to access array offset on null in /in/EhEgd on line 3 123 ''

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