What are common issues faced when updating PHP versions, such as the one mentioned in the forum thread regarding if-conditions not working after updating to PHP 7?

When updating PHP versions, common issues may arise due to deprecated functions or changes in syntax. In the case of if-conditions not working after updating to PHP 7, the problem could be related to the comparison operators used. PHP 7 introduced a stricter type checking system, so it's important to ensure that variables are of the correct type when using comparison operators.

// Incorrect code that may not work in PHP 7
$number = "5";
if ($number === 5) {
    echo "Equal";
} else {
    echo "Not equal";
}

// Corrected code for PHP 7
$number = "5";
if ($number == 5) {
    echo "Equal";
} else {
    echo "Not equal";
}