php contact form sending blank emails sometimes

Question

I\'ve gone thru tons of the forms and cant seem to find the answer. I have been working on this problem with my php form on and off for days. hope to find help here. the for

Answer 1

Add validation to the PHP, else even if no values was sent via POST, just by visiting the page its going to send a blank email. Most likely a search engine or such bot is just crawling.

So check its POST

<?php 
if($_SERVER['REQUEST_METHOD']==='POST'){
//put code here
}
?>

and check your values are set min-max length ect

<?php 

...
...
...

//Comments
if(empty($_POST['comments'])){
    //comments empty, do or set something
}else if(strlen($_POST['comments']) < 5){
    //not long enough, do or set something
}else if(strlen($_POST['comments']) > 50){
    //too large, do or set something
}
?>

and most importantly check email is really an email..

<?php 
if(filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)){
 //is an email
}else{
 //not an email
}
?>

Also your want to add a basic captcha else your be enjoying 1000s of marketing/spam emails per day.

Good luck, implementing it.