How can sessions be used to control the execution of an IF statement in PHP?

Sessions can be used to control the execution of an IF statement in PHP by storing a flag in the session variable to indicate whether the condition has been met or not. This flag can be checked before the IF statement is executed, and based on its value, the code inside the IF statement can be run or skipped.

<?php
session_start();

// Check if the condition has been met previously
if(isset($_SESSION['condition_met']) && $_SESSION['condition_met'] == true){
    // Code to execute if the condition has been met
    echo "Condition has been met!";
} else {
    // Code to execute if the condition has not been met
    echo "Condition has not been met!";
}

// Set the flag in the session variable
$_SESSION['condition_met'] = true;
?>