gwst/includes/update-password.php

<?php
include_once ('verifications.php');
$verifypass = $con->prepare("SELECT userpass FROM userinfo WHERE userid = ?");
$verifypass->bind_param("i", $_SESSION['userid']);
$verifypass->execute();
$result = $verifypass->get_result();
while ($row = $result->fetch_assoc()) {
	$vp = password_verify ($_POST['oldpass'],$row['userpass']);
	if ($vp) {
		$hp = password_hash($_POST['userpass1'], PASSWORD_DEFAULT);
		echo 'Verified old password, updating to new password!<br />';
		$updpass = $con->prepare("UPDATE userinfo SET userpass = ? WHERE userid = ?");
		$updpass->bind_param("si", $hp, $_SESSION['userid']);
		$updpass->execute();
		echo 'Password updated!<br />';
		$updpass->close();
	} else {
		echo 'Old password doesn\'t match, password is NOT updated!<br />';
	}
}
?>