With PHP's PEAR, how can I check whether package \[code\]foo\[/code\] in channel \[code\]bar\[/code\] is already installed? (Assuming that the channel \[code\]bar\[/code\] is available, and has already been "discovered".) Something like \[code\]pear list\[/code\] that displays installed packages in channel \[code\]bar\[/code\] only would be ideal.
List installed packages in channel
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