The PPM does not download and install the package's dependencies by default. You may choose to install each dependency separately, or you may add the a option to download and install all required and optional dependencies or the o option to download and install required dependencies only.
As seen in the preceding listing, not only is HTTP_Request downloaded as a required dependency of Cache, but Net_URL is downloaded as a dependency of HTTP_Request. When the install is a success, the PPM will note it with an appropriate message:
install ok: Cache 1.5.4
Similar to the install command is upgrade. PEAR packages are in a state of constant development, so there are often upgrades to packages. To check for package upgrades, type pear list-upgrades. If an upgrade exists, the PPM will show both the local version of the package and the current (upgrade) version in the repository.
Available Upgrades (stable):
============================ Package Local Remote Size
Archive_Tar 1.1 (stable) 1.2 (stable) 14.5kB
The preceding listing shows that an upgrade exists for Archive_Tar. To download and install this upgrade, type pear upgrade Archive_Tar. The process for downloading and checking dependencies is similar to that of the pear install command:
