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    <p>For reference, this is the <a href="https://github.com/laravel/framework/blob/v4.0.5/src/Illuminate/Container/Container.php#L126"><code>share</code> method @ v4.0.5</a>.</p> <p>So, what's happening here. I'll explain it in a couple of steps.</p> <h3>Calling The Share Method</h3> <p>As you pointed out this method is called from service providers. So, the <code>FilesystemServiceProvider</code> calls this method which looks something like this:</p> <pre class="lang-php prettyprint-override"><code>$this-&gt;app['files'] = $this-&gt;app-&gt;share(function() { return new Filesystem; }); </code></pre> <p>It's assigning the <em>return</em> value of this <code>share</code> method to a binding in the container. In a nutshell, that return value will be the new <code>Filesystem</code> instance that is returned in the closure.</p> <h3>So What Does Share Do?</h3> <p>The <code>share</code> method is just another way of defining a singleton in IoC container. All this can be a bit intimidating at first. Basically, Laravel itself is an IoC container. All the classes are bound as instances on the container. Sometimes these instances should be the <em>same</em> instance on every call.</p> <p>If you take a look at the referencing method above on GitHub, you'll notice that inside the closure a static variable is defined. It then checks if that variable is null, and if it is it resolves the closure (this is the closure that returns our new <code>Filesystem</code> instance). Then it simply returns the variable.</p> <p>Now, the next time you use <code>File::get()</code> it doesn't need to instantiate the <code>Filesystem</code> class again, because it's already been instantiated and stored in the static <code>$object</code> variable. So it simply returns the same object to you.</p> <p><strong>So!</strong> Really, you could replace the <code>$this-&gt;app['files']</code> line with this, and it would still work.</p> <pre><code>$this-&gt;app-&gt;instance('files', new Filesystem); </code></pre> <p>99% of services actually use the <code>share</code> method though because working inside a closure allows objects to be instantiated with more complex dependencies.</p> <p>Hope this helps.</p>
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    1. POLaravel 4 - Container class: share function & closure logic
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    1. USJason Lewis
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    1. COThank you for this great answer, I wonder why it is not accepted ? Anyway, Laravel made me finally grasp PHP (I am a long time JS developer) which wasn‘t a case with any other framework.
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