How can the issue of displaying 0, -1, -2 instead of "Abgelaufen" when the time period has expired be resolved in the code?

The issue can be resolved by checking if the time period has expired and displaying 0, -1, or -2 instead of "Abgelaufen" accordingly. This can be achieved by using an if-else statement to determine the appropriate value to display based on the expiration status. 

<?php
// Assuming $timeLeft contains the time left in seconds

if ($timeLeft <= 0) {
    if ($timeLeft == 0) {
        echo "0";
    } elseif ($timeLeft == -1) {
        echo "-1";
    } else {
        echo "-2";
    }
} else {
    echo "Noch gültig";
}
?>

Keywords

PHP date strtotime comparison conditional statements

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