class_exists
Checks if the class has been defined
Description
bool class_exists(string $class, bool $autoload = true)
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 it
if (class_exists('MyClass')) {
$myclass = new MyClass();
}
?>
Example #2 autoload parameter example
<?php
spl_autoload_register(function ($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
- function_exists
- enum_exists
- interface_exists
- get_declared_classes