Is _($string) part of PHP4?

From: Date: Thu, 03 Feb 2000 23:21:12 +0000
Subject: Is _($string) part of PHP4?
Groups: php.version4 
Request: Send a blank email to php-version4+get-9769@lists.php.net to get a copy of this message
...and if so, can someone suggest where I go to look up that and anything else on PHP4? Do I just download sourcecode and look (if so, fine, but I was hoping ...).

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