javascript - ajax responseText is returning header bar with echo content -

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i using ajax communicate php.when fetched data shows typed email present on database,i used echo message 'email taken,try email'.but ajax responsetext returning header file , echoed content.here image

enter image description here

how can echoed message ajax responsetext?

here codes

javascript

function signup(){   var f=document.getelementbyid("firstname").value;   var l=document.getelementbyid("lastname").value;   var p=document.getelementbyid("password1").value;   var p2=document.getelementbyid("password2").value;   var e=document.getelementbyid("email").value;   var status=document.getelementbyid("status");    if(f=="" || l=="" || p=="" || p2=="" || e==""){      status.innerhtml="all fields required";   }   else if(p!=p2){      status.innerhtml="passwords didn't match";   }   else{     document.getelementbyid("submitx").style.display = "none";     //status.innerhtml = 'please wait ...';     var x=new xmlhttprequest();     x.open("post","signup.php",true);     x.setrequestheader("content-type","application/x-www-form-urlencoded");     x.onreadystatechange=function(){     if(x.readystate == 4 && x.status == 200){      if(x.responsetext != "success"){  //this condition not met @ circumstances          document.getelementbyid("submitx").style.display = "block";          status.innerhtml="";          //alert(x.responsetext);          status.innerhtml = x.responsetext;         }        else{          window.scrollto(0,0);          status.innerhtml ="";          document.getelementbyid("diff_for").innerhtml = "";          document.getelementbyid("form1").innerhtml = "";          document.getelementbyid("form1").innerhtml = "thank creating account.a welcome email has been sent email.<br/><br/>go <a href='login.php'>login</a>";       }      }    }   x.send("f="+f+"&l="+l+"&e="+e+"&p="+p+"&p2="+p2);  } }

php

if(isset($_post['f'])){   $firstname=$_post['f'];   $lastname=$_post['l'];   $password=$_post['p'];   $passmatch=$_post['p2'];   $pass=md5($password);   $email=$_post['e'];   $sqlx1="select id user_det email=? limit 1";     mysqli_stmt_prepare($stmt30, $sqlx1);    mysqli_stmt_bind_param($stmt30, "s", $email);    mysqli_stmt_execute($stmt30);    mysqli_stmt_store_result($stmt30);    mysqli_stmt_bind_result($stmt30, $idx1);    $num_row1x=mysqli_stmt_num_rows($stmt30);       if($num_row1x>0){        //ob_end_clean();        //ob_start();        $abul="<br>this email registered.please use email";        echo $abul;        exit();      }      else{        $sql11x="insert user_det(first_name,last_name,password,email,signup_date)                values(?,?,?,?,now())";         mysqli_stmt_prepare($stmt30, $sql11x);        mysqli_stmt_bind_param($stmt30, "ssss", $firstname, $lastname, $pass, $email);        mysqli_stmt_execute($stmt30);                            echo "success";      }

i appreciate help.

thanks time.

with additional comment, see what's happening.

it not visible partial php code posted, , should post whole code if not heavy.

but it's pretty sure error resides somewhere near top of php file: when test if(isset($_post['f'])){ have output begin of original page, generated same php file.

btw, should ensure exit; after echoing message responding ajax call.


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