Today I stumbled on a bug report for the
package in PEAR:
Bug #20222: 1.8.8 not compatible with PHP4
So in March 2014, someone noticed that a minor version upgrade of a package
broke it on PHP4.
But PEAR takes backwards
so this bug was fixed.
The PEAR version naming standard looks similar to
Just remember that PEAR already decided on
to follow this rules.