php page refresh after submit code example

Example 1: prevent form submit on page refresh php\

//Using Javascript
<script>
if ( window.history.replaceState ) {
        window.history.replaceState( null, null, window.location.href );
    }
</script>

Example 2: php do not refresh page after submit post

// add this code to javascript
<script>
    if ( window.history.replaceState ) {
        window.history.replaceState( null, null, window.location.href );
    }
</script>