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POPHP: object is NULL right after creation
 

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    <p>We have very strange errors occasionally popping up in our <a href="http://www.php.net/manual/en/errorfunc.configuration.php#ini.error-log" rel="nofollow">php logs</a>: <code>Trying to get property of non-object.</code></p> <p>This exact error seems to be caused by the access to the member <code>$shortName</code> in the following if statement:</p> <pre><code>class MyLocaleWrapper extends SomeOtherClass { … protected static $system = NULL; public static function getSystemLocale() { if (self::$system === NULL) { self::$system = new self(); debug(self::$system); self::$system-&gt;rfcName = SYSTEM_LOCALE_RFCNAME; self::$system-&gt;shortName = strtolower(Locale::getRegion(self::$system-&gt;rfcName)); if (self::$system-&gt;shortName == '') { self::$system-&gt;shortName = strtolower(self::$system-&gt;rfcName); } … # in another file: class SomeOtherClass { … public function __construct() { # Some documentation about features that have been # removed from the constructor, but no real code in here. return NULL; } … # in yet another file: MyLocaleWrapper::getSystemLocale(); </code></pre> <p>if I dump <code>self::$system</code> into a log file, I see that it is <code>NULL</code> - right after being constructed with the keyword <code>new</code>.</p> <p>The most interesting part is that this file is included in each and every request to our page, so it gets executed ~ 10 times per second. But occasionally it just fails without anyone touching the code (or even the server).</p> <p>Has anyone else ever experienced such behavior in PHP?</p>
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    1. COis there anything inside the code that can reset the static instance?
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    2. COHm...why are you creating a new instance of the class from within the class? I'm probably wrong, but wouldn't it make more sense to create a single instance when you initially call it, and refer to it from within with the `$this` keyword?
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    3. CO@Gordon: The code I pasted is complete, I haven't left anything out - but I have hard times believing this myself.
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