null - Variable Undefined in PHP -


i have 5 fields in db:

test1 = 1, test2 = 1, test3 = null, test4 = null, test5 = null

php code:

if(isset($result['test1'])){$test1= "test1"; echo $test1};  if(isset($result['test2'])){$test2= "test2"; echo $test2};  if(isset($result['test3'])){$test3= "test3"; echo $test3};  if(isset($result['test4'])){$test4= "test4"; echo $test4};  if(isset($result['test5'])){$test5= "test5"; echo $test5};  $total = implode(", ", array_filter(array($test1, $test2, $test3, $test4, $test5)));  echo $total;

finaly output:

undefined variable test3 in line 7

undefined variable test4 in line 7

undefined variable test5 in line 7

test1, test2

i came 3 possible ways run code null values see if blank page no error, unfortunately, gave me "underfined variable" error:

  1. if(isset($result['test3'])){$test3= "ok"; echo $test3};

  2. if(!empty($result['test3'])){$test3= "ok"; echo $test3};

  3. if($result['test3']=='1'){$test3= "ok"; echo $test3};

help? in advance!

if(isset($result['test1'])){$test1= "test1"; echo $test1} else { $test1="abrakadabra"; }

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