Are there any common pitfalls or compatibility issues between PHP 5 and MySQL 4 that could lead to extension loading problems?

One common compatibility issue between PHP 5 and MySQL 4 that could lead to extension loading problems is the use of deprecated functions or features in PHP 5 that are not supported in MySQL 4. To solve this issue, make sure to update your code to use compatible functions and features that work with both PHP 5 and MySQL 4. 

// Example of updating deprecated function mysql_connect to mysqli_connect
$mysqli = mysqli_connect('localhost', 'username', 'password', 'database');
if (!$mysqli) {
    die('Could not connect: ' . mysqli_error());
}
echo 'Connected successfully';

Keywords

PHP 5 MySQL 4 extension loading compatibility issues pitfalls

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