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POretrieving Message from a json array
 

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  1. POretrieving Message from a json array
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    <p>I want to check the username availability while users register. I am working on the front end. The backend code was given to me. </p> <p>These are the php code in signup.php</p> <pre><code>if (isset($_GET['chkusername'])) JSON_username_avail($_GET['chkusername']); function JSON_username_avail($username) { $ret = array(); print json_encode(validate_username($username, $ret)); die(); } function validate_username($username, &amp; $retval_arr) { if ($username == NULL) $retval_arr['E_UserName'] = "NULL_USERNAME"; else if (!username_validation($username)) $retval_arr['E_UserName'] = "INVALID_USERNAME"; else if (!data_not_exists("user", "username", $username, TRUE)) $retval_arr['E_UserName'] = "USERNAME_EXISTS"; return $retval_arr; } function username_validation($user) { $username = str_split($user); foreach($username as $i) { $i = ord($i); if ($i &gt;= 48 and $i &lt;= 57) continue; if ($i &gt;= 65 and $i &lt;= 90) continue; if ($i &gt;= 97 and $i &lt;= 122) continue; return FALSE; } return TRUE; } function data_not_exists($table, $field, $data, $CSense = FALSE) { $conn = connect_db(); $data = filter_var($data, FILTER_SANITIZE_STRING); if ($CSense == TRUE) $sql = "SELECT * FROM ".$table. " WHERE ".$field. "='".$data. "'"; else $sql = "SELECT * FROM ".$table. " WHERE upper(".$field. ")='".$data. "'"; $result = mysqli_query($conn, $sql); switch ($result - &gt; num_rows) { case 0: return TRUE; break; case 1: return FALSE; break; default: die("500 Internal Server Error: 122"); } //switch } </code></pre> <p>Now I dont know that much of php. I created a javascript function to send the username to the signup.php page for validation. </p> <p>Here is my function</p> <pre><code>function submit_form() { var u = document.getElementById("username").value; $.post("signup.php", { "chkusername": u }, function (data) { var x = data; //here i dont know how to get the return string. Whether it is NULL_USERNAME OR INVALID_USERNAME OR USERNAME_EXISTS. }, "json"); } </code></pre> <p>here i am getting the value of x as [object Object]. But i need to store the return message in variable x. I want to know whether it is NULL_USERNAME OR INVALID_USERNAME OR USERNAME_EXISTS. Kindly help me with that.</p>
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    1. USAnkur
    1. USAravind Bharathy
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    1. COFYI, `filter_var($data,FILTER_SANITIZE_STRING)` will not stop sql injections
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      1. USLawrence Cherone
 

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