Why Are mysql_* Functions Not Working After PHP Upgrade to 5.5.0?

PHP Upgrade: Unable to Use mysql_* Functions

After upgrading to PHP 5.5.0 from a previous version such as PHP 5.2.0, developers may encounter issues with deprecated mysql_* functions. One common error encountered is:

Deprecated: mysql_real_escape_string()

To resolve this issue, it is recommended to replace deprecated mysql_ functions with their mysqli_ counterparts. For example, mysqli_real_escape_string() should be used instead of mysql_real_escape_string().

However, it is important to note that mysqli_real_escape_string() requires two parameters: a connection variable and the escaping string. When attempting to use mysqli_real_escape_string() with only one argument, the following error may be encountered:

Warning: mysqli_real_escape_string() expects exactly 2 parameters, 1 given in

To fix this error, the connection variable must be passed as the first argument. This variable is obtained by establishing a connection to the database using mysqli_connect():

<code class="php">$connection = mysqli_connect("host", "username", "password", "database");</code>

The code example provided can be revised to use mysqli_real_escape_string() correctly:

<code class="php">$username = mysqli_real_escape_string($connection, $username);
$password = mysqli_real_escape_string($connection, $password);</code>

It is essential to update PHP knowledge regularly to stay current with the latest best practices and avoid such errors. Alternatively, consider using a database object to connect to the database and handle escaping automatically.

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