How to create form captcha validation using PHP and Java Script ?

Ravi

I want to create form captcha using php and java script

Rahul

Use this code
<?php
$code=rand(1000,9999);
?>

<-script start->
    function myfun(){ 
        var x = document.getElementById('captcha1').value;
        var y = <?php echo $code  ?>;
        
        if (x == y) {
            return true;
        }
        else{
            return false;
        }
    }
<-script end->
<-form->
<-span-><?php echo $code;?><-/span->
<-input id="captcha1" name="captcha" type="text">
<-input id="button" type='submit'  onclick=" return myfun();" value='Submit'>
<-/form->