how to send values to previous page through url code example

Example 1: send value from one page to another in php

//On page 1
$_SESSION['varname'] = $var_value;

//On page 2
$var_value = $_SESSION['varname'];

Example 2: send data with url in php

// Send the variables myNumber=1 and myFruit="orange" to the new PHP page...
<a href="page2.php?myNumber=1&myFruit=orange">Next page</a>