user already exits

This Code Is use for User name Already Exits or email id already exits 

 here this function call using Ajax Method 

 <?php 

function ckhuserid($udetail){
$arr=explode("!@@@!",$udetail); 

if($arr[1]=='edit'){
$val=executescalar("user","id","uname='".$arr[0]."' and id<>'".$arr[2]."' ", "","false","str"); 

} else { 

 $val=executescalar("user","id","uname='".$arr[0]."'", "","false","str");
 }
if($val!=''){ // alresdy exist 
 echo "yes";
}
} 
?> 
// JavaScript Code

<script>
            
function ckhuserid(x,cas,id){ // x=this; cas= case=registration or edit profile , id=user id on edit time 
uname=$(x).val();
str=uname;
if(cas=='edit'){
str=uname+"!@@@!edit!@@@!"+id;
}
$.ajax({
  type: 'POST',
  url: "admin/Ajax/functions.php?f=ckhuserid&p="+str,
  data: {},
  success: function(data12){ 
 // alert(data12);
  if(data12=='yes'){
      alert("user name already exist"); $(x).focus(); return false ;
  }   
   
  }});
    return true ;
}
</script> 


// calling method 

<input type="text" onblur="return ckhuserid(this,0,0)"  /> // add time

<input type="text" onblur="return ckhuserid(this,'edit',id)"  /> // edit  time

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