Description:
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From manual page: http://www.php.net/function.popen
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"Opens a pipe to a process executed by forking the command given by command."

The last word "command" (name of a parameter) should be in bold font, as per the manual pages of other functions (e.g. http://www.php.net/function.exec.php). I'm talking about the manual as it's rendered on the web, not the source document.