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Yaf_Config_Ini::__isset() is a method in PHP's Yaf framework that checks if a given key exists in the configuration ini file.

To use this method, you need to create an instance of the Yaf_Config_Ini class, passing the path to the configuration ini file as a parameter. Then you can use the __isset() method to check if a specific key exists in the configuration.

Here is an example:

php
$config = new Yaf_Config_Ini('/path/to/config.ini');
if ($config->__isset('key')) {
echo "The key exists in the configuration.";
} else {
echo "The key does not exist in the configuration.";
}


In this example, '/path/to/config.ini' is the path to the configuration ini file. Change it to the actual path of your configuration file.

The __isset() method returns a boolean value - true if the key exists in the configuration, and false otherwise. You can use this method to conditionally handle different scenarios based on the existence of a key in the configuration file.