Online PHP editor | output for 2lM4H

@ 2013-01-15T08:24:17Z

<?php

function decorate(callable $fn, array $decorators, array $arguments = array())
{
    foreach (array_reverse($decorators) as $decorator) {
        if (is_callable($decorator)) {
	        $fn = $decorator($fn);
        }
    }

    return call_user_func_array($fn, $arguments);
}

function decorator(callable $decorator)
{
    // This function replaces 'trace'
    return function($wrapped) use ($decorator) {
        // This function replaces the function which 'trace' is used on.
        return function() use ($wrapped, $decorator) {
            $arguments = func_get_args();
            return call_user_func($decorator, $wrapped, $arguments);
        };
    };
}

function _trace(callable $fn, array $arguments)
{
    printf("Calling %s with arguments %s\n", print_r($fn, true), print_r($arguments, true));
    return call_user_func_array($fn, $arguments);
}

function trace()
{
	return decorate('_trace', ['decorator'], func_get_args());
}

function _foo()
{
    echo "Foo";
}

function foo()
{
    return decorate('_foo', ['trace'], func_get_args());
}

foo();

Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Calling _foo with arguments Array ( ) Foo
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/2lM4H on line 34
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/2lM4H on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/2lM4H on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/2lM4H on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting ')' in /in/2lM4H on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/2lM4H on line 3
Process exited with code 255.

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