PHP code to send mail in PHP feedback form

As we get all data by POST method so we will collect them like this.

$n1=$_POST['n1'];
$n2=$_POST['n2'];
$email=$_POST['email'];

We need to validate the data and reply with error message to the visitors so we will set a flag and check the data.

$status = "OK"; // Flag is set 
$msg="";          // Error message to store
/////
// Data Validation starts ///////
// if first Name is less than 3 char then status is not ok
if( strlen($n1) < 3){
$msg=$msg."Please  enter your name
";
$status= "NOTOK";}

if(!filter_var($email,FILTER_VALIDATE_EMAIL)){
$msg=$msg." Please check your email address
";
$status= "NOTOK";}

If you want add more validation then you can further extend the above code to cover other data.
Now we will send PHP mail like this.

mail("user@example.com",$sub,$body_dtl,$headers); // Posting mail

Here is the complete code.

<?Php
@$feedback=$_POST['feedback'];
if(isset($feedback) and $feedback=="post_feedback"){
////////////////// Collecting all data ///////////
$n1=$_POST['n1'];
$n2=$_POST['n2'];
$email=$_POST['email'];
$phone=$_POST['phone'];
$add1=$_POST['add1'];
$add2=$_POST['add2'];
$city=$_POST['city'];
$state=$_POST['state'];
$country=$_POST['country'];
$zip=$_POST['zip'];
$sum=$_POST['sum'];
$dtl=$_POST['dtl'];
///////////////// end of collecting data///
$status = "OK"; // Flag is set 
$msg="";          // Error message to store
/////
// Data Validation starts ///////
// if first Name is less than 3 char then status is not ok
if( strlen($n1) < 3){
$msg=$msg."Please  enter your name<BR>";
$status= "NOTOK";}

if(!filter_var($email,FILTER_VALIDATE_EMAIL)){
$msg=$msg." Please check your email address<BR>";
$status= "NOTOK";}

if( $sum <> 3){
$msg=$msg."Please  check the spam control Sum<BR>";
$status= "NOTOK";}

if( strlen($dtl) < 3){
$msg=$msg."Please  enter your message details<BR>";
$status= "NOTOK";}
///// You can add more such validation for other data if required ///
///// End of data validation /////

if($status<>"OK"){ 
$msg = "<font face='Verdana' size='2' color=red>$msg</font>"; // post the error message
}else{ // if all validations are passed.
//// Sending mail ////
$headers="";
$headers4=$email;  // Change this to change from address
$headers.="Reply-to: $headers4 n";
$headers .= "From: $headers4 n"; 
$headers .= "Errors-to: $headers4 n";

$browser=$_SERVER['HTTP_USER_AGENT'] . "nn"; // browser details of user
$ip=$_SERVER['REMOTE_ADDR']; // IP address of user

$body_dtl="This is the feedback from sitename.com \n\n First Name :$n1 \n Last Name :$n2 
\n Email Addrss: $email \n Phone no:$phone \n Address1:$add1 \n Address2:$add2 \n City:$city 
\n State:$state \n Country:$country \n Zip:$zip \n  IP:$ip nn".$browser. "Message Details : $dtl";
//echo $body_dtl;
//echo $headers;
$sub="Feedback From example.com";

//mail("user@example.com",$sub,$body_dtl,$headers); // Posting mail

//// End of sending Mail /////

$msg= "<center><font face='Verdana' size='2' color=green>
Thank you <br> We will back to you shortly. </font></center>";
}

$str= "{ "value" : [{"msg" : "$msg","status" : "$status"}]}";

echo $str;
}// Checking of if condition if form is submittted

?>

Basic of Feedback from

Part 2 HTML part of Feedback from

Part 3 JavaScript code of Ajax Feedback from

part 4 PHP script of Feedback from

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