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Sami Samhuri a52beb54f8 recover a few more stragglers
2011-12-11 02:23:55 -08:00

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<h2>Late static binding</h2>
<p class="auth"><!-- Posted by <a href="mailto:sjs@uvic.ca">Sami Jensen Samhuri</a> -->
<span class="typo_date" title="Wed, 19 Jul 2006 17:23:00 GMT">Wed, 19 Jul 2006 17:23:00 GMT</span></p>
<p><em>Update: This has <a href="http://web.archive.org/web/20061018215014/http://www.php.net/~derick/meeting-notes.html#late-static-binding-using-this-without-or-perhaps-with-a-different-name">been discussed</a> and will be uh, sort of fixed, in <span class="caps">PHP6</span>. You&#8217;ll be able to use static::my_method() to get the real reference to self in class methods. Not optimal, but still a solution I guess.</em></p>
<p>As colder on ##php (freenode) told me today, class methods in <span class="caps">PHP</span> don&#8217;t have what they call late static binding. What&#8217;s that? It means that this code:</p>
<pre>
<code>
class Foo
{
public static function my_method()
{
echo "I'm a " . get_class() . "!\n";
}
}
class Bar extends Foo
{}
Bar::my_method();
</code>
</pre>
<p>outputs &#8220;I&#8217;m a Foo!&#8221;, instead of &#8220;I&#8217;m a Bar!&#8221;. That&#8217;s not fun.</p><p>Using <code>__CLASS__</code> in place of <code>get_class()</code> makes zero difference. You end up with proxy methods in each subclass of Foo that pass in the real name of the calling class, which sucks.</p>
<pre>
<code>
class Bar extends Foo
{
public static function my_method()
{
return parent::my_method( get_class() );
}
}
</code>
</pre>
<p>I was told that they had a discussion about this on the internal <span class="caps">PHP</span> list, so at least they&#8217;re thinking about this stuff. Too bad <span class="caps">PHP5</span> doesn&#8217;t have it. I guess I should just be glad I won&#8217;t be maintaining this code.</p>
<p>The resident <span class="caps">PHP</span> coder said &#8220;just make your code simpler&#8221;, which is what I was trying to do by removing duplication. Too bad that plan sort of backfired. I guess odd things like this are where <span class="caps">PHP</span> starts to show that OO was tacked on as an after-thought.</p>
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<cite><strong>Jim Roepcke</strong> </cite> said 25 days later:<br />
<p>That&#8217;s the worst of both worlds.</p>
<p>In Objective-C, that would work properly. In Java, it wouldn&#8217;t work at all because static methods (Java doesn&#8217;t have class methods) aren&#8217;t inherited by subclasses, so at least if you called the method on the superclass the result would be consistent&#8230;. but this, this crap (as <span class='caps'>PHP</span> always is), well, it isn&#8217;t consistent with anything. Doesn&#8217;t get any worse. But, I&#8217;m hardly surprised.</p>
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<cite><strong>Sami</strong> </cite> said 34 days later:<br />
<p>Interesting about Java, I didn&#8217;t know static methods weren&#8217;t inherited.</p>
<p>I have to say that I don&#8217;t know if I can work another job using <span class='caps'>PHP</span> and keep my sanity. :)</p>
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<h3>All about...</h3>
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<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/pages/about">a bit about me</a></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/pages/thunder">workstation</a></li>
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<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/amusement">amusement</a> <em>(5)</em></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/gentoo">gentoo</a> <em>(1)</em></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/hacking">coding</a> <em>(16)</em></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/life">life</a> <em>(5)</em></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/linux">linux</a> <em>(2)</em></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/mac-os-x">mac os x</a> <em>(6)</em></li>
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<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/textmate">textmate</a> <em>(10)</em></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/apple">apple</a> <em>(6)</em></li>
<li><a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/category/php">php</a> <em>(4)</em></li>
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<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/09">September 2006</a>
<em>(2)</em>
</li>
<li>
<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/08">August 2006</a>
<em>(1)</em>
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<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/07">July 2006</a>
<em>(5)</em>
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<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/06">June 2006</a>
<em>(4)</em>
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<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/05">May 2006</a>
<em>(2)</em>
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<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/04">April 2006</a>
<em>(1)</em>
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<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/03">March 2006</a>
<em>(4)</em>
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<li>
<a href="http://web.archive.org/web/20061018215014/http://sami.samhuri.net/articles/2006/02">February 2006</a>
<em>(15)</em>
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<h3>Links</h3>
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<li><a href="http://web.archive.org/web/20061018215014/http://phox.ca/cswiki/Main_Page">CSWiki</a></li>
<li><a href="http://web.archive.org/web/20061018215014/http://jim.roepcke.com/">Have Browser, Will Travel</a></li>
<li><a href="http://web.archive.org/web/20061018215014/http://blog.inquirylabs.com/">Going Up</a></li>
<li><a href="http://web.archive.org/web/20061018215014/http://www.mirage.org/">encieno</a></li>
<li><a href="http://web.archive.org/web/20061018215014/http://www.nofxwiki.net/">nofxwiki.net</a></li>
<li>sami at samhuri dot net</li>
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