php - Why I get Allowed memory size of 134217728 bytes exhausted error -

i can not find error @ code. problem coming array_push method (allowed memory size of 134217728 bytes exhausted).

code:

<?php     require "dbconnect.php";     $username = $_post['username'];      if ($username != '') {         $sql = "select * users username='$username'";          $result = mysqli_query($con, $sql);         $check = mysqli_fetch_array($result);         $data = array();          if (isset($check)) {             echo "4";             while ($row = mysqli_fetch_array($result)){                 echo "2";                 array_push ($data, array('name'=>$row[1], 'username'=>$row[2], 'password'=>$row[3], 'email'=>$row[4]));             }              echo json_encode(array("response"=>$data));             mysqli_close($con);          } else {             echo "0";         }     } else {         echo "3";     } ?> 

error:

<br /> <b>fatal error</b>:  allowed memory size of 134217728 bytes exhausted (tried allocate 64 bytes) in <b>/home/u766232015/public_html/phpscripts/getuserdata.php</b> on line <b>14</b><br /> 

that while() loop isn't going ever stop looping, nothing being changed inside it. need move mysqli_fetch_array call loop condition, e.g.

while ($row = mysqli_fetch_array($result)) {   ... }