When should function_exists and class_exists be used in PHP code?

function_exists and class_exists should be used in PHP code when you want to check if a function or class exists before attempting to use it. This can help prevent errors or unexpected behavior in your code, especially when working with functions or classes that may not always be available. 

// Check if a function exists before calling it
if (function_exists('my_function')) {
    my_function();
}

// Check if a class exists before using it
if (class_exists('MyClass')) {
    $obj = new MyClass();
}

Keywords

function_exists class_exists PHP code error types libraries

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