What Causes \'Unexplainable Fatal Error\' When Connecting to MySQL with PHP 7?

MySQL Connection Errors with PHP 7

When working with PHP and MySQL, an "Unexplainable Fatal error" may occur, indicating that the mysql_connect() function is not defined. This error can be attributed to an outdated PHP version.

The Problem:

PHP 7 has deprecated the mysql_* functions, including mysql_connect(). As a result, attempting to use these functions in PHP 7 will result in an undefined function error.

The Solution:

To resolve this issue, you need to upgrade your code to use the mysqli_* functions. Here's an example of how you can fix the issue:

<code class="php">$host = "127.0.0.1";
$username = "root";
$pass = "foobar";
$con = mysqli_connect($host, $username, $pass, "your_database");</code>

Upgrading Legacy Code:

If you are upgrading legacy PHP code, you will need to replace all occurrences of mysql_ functions with their mysqli_ counterparts. This includes functions such as mysql_query(), mysql_fetch_array(), and others.

By updating your code to use the mysqli_* functions, you will avoid the undefined function error and ensure that your code is compatible with PHP 7.

The above is the detailed content of What Causes \'Unexplainable Fatal Error\' When Connecting to MySQL with PHP 7?. For more information, please follow other related articles on the PHP Chinese website!