recursion - return keyword is not working correctly in php -

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i using piece of function check if file exist. if file exist changing name

 function checkfileexist($filename,$z,$ext,$folderwithfilename){     $tmpnam="";       if (file_exists($filename."_".$z.".".$ext)) {             $z=$z+1;             checkfileexist($filename,$z,$ext,$folderwithfilename);         }else{             $tmpnam=$filename."_".$z;             echo "in else <br> ".$filename."_".$z."<br>";             }     return $tmpnam; }

and calling function like

$definename=checkfileexist($folderwithfilename."/".$invid,$z,$ext,$folderwithfilename); echo "new name ".$definename;

but gives me output this

in else  444_2015-10-27/444_3 new name

you can see return not working correctly, doing wrong here?

you should use return checkfileexist($filename,$z,$ext,$folderwithfilename); in first block return value recursively made calls. use clean version:

function checkfileexist($filename, $z, $ext, $folderwithfilename){     if (file_exists($filename."_".$z.".".$ext)) {         return checkfileexist($filename, $z+1, $ext, $folderwithfilename);     }     return $filename."_".$z; }

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