Online PHP editor | output for Wju5q

@ 2014-10-09T16:58:03Z

<?php

class Foo
{
    private $bar = 'baz';

    public function getBar()
    {
        return $this->bar;
    }
}

// http://3v4l.org/pc6lo#v540
class ClassicLazyFoo extends Foo
{
    private $initialized = false;

    public function getBar()
    {
        $this->init();

        return parent::getBar();
    }

    private function init()
    {
        if ($this->initialized) { return; }

        \Closure::bind(function() {
            $this->bar = 'Loaded from DB!';
        }, $this, get_parent_class($this))->__invoke();
    }
}

// look ma: no method overrides!
class LazyPropertyLazyFoo extends Foo
{
    public function __construct()
    {
        \Closure::bind(function() {
            unset($this->bar);
        }, $this, get_parent_class($this))->__invoke();
    }

    // note that other magic accessors also need to be created for full functional completeness
    public function __get()
    {
        \Closure::bind(function() {
            $this->bar = 'Loaded from DB!';
        }, $this, get_parent_class($this))->__invoke();
    }
}


var_dump((new ClassicLazyFoo())->getBar());
var_dump((new LazyPropertyLazyFoo())->getBar());

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.32: Fatal error: Method LazyPropertyLazyFoo::__get() must take exactly 1 argument in /in/Wju5q on line 51
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Wju5q on line 29 Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/Wju5q on line 29
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/Wju5q on line 29 Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/Wju5q on line 29
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/Wju5q on line 5
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 T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/Wju5q on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/Wju5q on line 5
Process exited with code 255.

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