What are the potential issues with using include or require in class definitions in PHP?

Using include or require in class definitions in PHP can lead to unexpected behavior or errors if the included file is not found or loaded correctly. To solve this issue, it is recommended to use autoloading mechanisms, such as spl_autoload_register, to dynamically load classes when they are needed. 

spl_autoload_register(function($class) {
    include $class . '.php';
});

Keywords

include require class definitions PHP errors

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