How to pipe a command output into another command

From: Date: Wed, 21 Feb 2001 14:44:54 +0000
Subject: How to pipe a command output into another command
Groups: php.general 
Request: Send a blank email to php-general+get-40956@lists.php.net to get a copy of this message
From within PHP, I'm trying to execute an external command and pipe (|) the result into another command, then capture the output. I've tried everything, exec, system, passthru, popen and backtick, and still could get it to work. Has anyone done it before? Is it possible with PHP? Running PHP 4.0.1pl2 as a Apache module. Thanks.

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