Checks if the class has been defined
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    class_exists

    (PHP 4, PHP 5, PHP 7, PHP 8)

    class_exists — Checks if the class has been defined

    Description

    class_exists(string $class, bool $autoload = true): bool

    This function checks whether or not the given class has been defined.

    Parameters

    class

    The class name. The name is matched in a case-insensitive manner.

    autoload

    Whether to autoload if not already loaded.

    Return Values

    Returns true if class is a defined class, false otherwise.

    Examples

    Example #1 class_exists() example

    <?php// Check that the class exists before trying to use itif (class_exists('MyClass')) {    $myclass = new MyClass();}?>

    Example #2 autoload parameter example

    <?phpspl_autoload_register(function ($class_name) {    include $class_name . '.php';    // Check to see whether the include declared the class    if (!class_exists($class_name, false)) {        throw new LogicException("Unable to load class: $class_name");    }});if (class_exists(MyClass::class)) {    $myclass = new MyClass();}?>

    See Also