Are there any specific PHP version compatibility issues that could be affecting the login functionality in this case?

The login functionality may be affected by PHP version compatibility issues, especially if the code is using deprecated functions or features that are no longer supported in newer PHP versions. To solve this issue, it is recommended to update the code to use modern PHP practices and functions that are compatible with the PHP version being used. 

// Example of updating code to use modern PHP practices
// Replace deprecated functions like mysql_real_escape_string with mysqli_real_escape_string

// Before
$username = mysql_real_escape_string($_POST['username']);
$password = mysql_real_escape_string($_POST['password']);

// After
$connection = mysqli_connect("localhost", "username", "password", "database");
$username = mysqli_real_escape_string($connection, $_POST['username']);
$password = mysqli_real_escape_string($connection, $_POST['password']);

Keywords

PHP version compatibility login functionality authentication error handling debugging

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