PHP-INSERT THAN UPDATE USING ORACLE DATABASE

<?php

$con = oci_connect('test', 'tewst', 'ur address');
if (!$con) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}/* else {
   print "Connected to Oracle!";
} */


   

 //Getting the username and otp
 $PHONE_NO = $_REQUEST['PHONE_NO'];
 $otp = $_REQUEST['OTP'];



 //Creating an SQL to fetch the otp from the table
 $sql = oci_parse($con,"SELECT OTP FROM SE WHERE MOB_NO = '$PHONE_NO'");
 $row=oci_execute($sql) or die(oci_error($sql));



      $objResult = oci_fetch_array($sql);


 //Getting the otp from the array 
echo $realotp =  $objResult['OTP'];



 //If the otp given is equal to otp fetched from database
 if($otp == $realotp){
 //Creating an sql query to update the column verified to 1 for the specified user
 $objParse = oci_parse($con,"UPDATE SE SET OTP_ACT = 1 WHERE MOB_NO ='$PHONE_NO'");

 $objExecute = oci_execute($objParse, OCI_DEFAULT);


 // Insert & commits
//$row1=oci_execute($sql1) or die(oci_error($sql1));

 //If the table is updated
 if($objExecute){
 //displaying success
 oci_commit($con); //*** Commit Transaction ***//
 echo 'success';
 }else{
 //displaying failure
 echo 'failure';
 }
 }else{
 //displaying failure if otp given is not equal to the otp fetched from database 
 echo 'failure';
 }