What are some common pitfalls when running PHP4 scripts on a PHP5 server?

One common pitfall when running PHP4 scripts on a PHP5 server is the use of deprecated functions and features that are no longer supported in PHP5. To solve this issue, you will need to update your code to use modern PHP syntax and functions that are compatible with PHP5. 

// Before PHP5, the "mysql_" functions were commonly used for database operations
// In PHP5, it is recommended to use the "mysqli" or "PDO" extension for database connectivity

// PHP4 code using mysql_connect
$connection = mysql_connect('localhost', 'username', 'password');

// PHP5 code using mysqli_connect
$connection = mysqli_connect('localhost', 'username', 'password');

Keywords

PHP4 PHP5 backward compatibility deprecated functions error messages

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