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<?php $a=array("", " ", 0, false, array(), "45"); $r=0; foreach($a as $i => $s) if (trim($s) == "") $r.=$i; echo $r;
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: trim(): Argument #1 ($string) must be of type string, array given in /in/4X3ct:4 Stack trace: #0 /in/4X3ct(4): trim(Array) #1 {main} thrown in /in/4X3ct on line 4
Process exited with code 255.

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