How can PHP be used to check if a graphic engine is installed?

To check if a graphic engine is installed using PHP, you can use the `function_exists` function to check if a specific function related to the graphic engine is available. For example, you can check if the GD library is installed by checking if the `imagecreate` function exists. 

if (function_exists('imagecreate')) {
    echo 'GD library is installed.';
} else {
    echo 'GD library is not installed.';
}

Keywords

PHP graphic engine detection library function

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