As someone who has written PHP for years, I would say it's starting to matter. The inability for PHP to adapt in a speedy fashion to new programming trends, the continuous implementation of features in a half-assed fashion (namespaces, anonymous functions, etc), and the unwillingness to even attempt to clean up the standard library have begun to marginalize PHP.
It's now easier and faster to get up and running with JavaScript or even Ruby, and these languages have more internal consistency than PHP, meaning that long-term they will see more skilled developers using them and thus will eventually have more and better libraries than PHP.
In addition, the JVM has reached a point where languages like Scala can compete, and apart from the initial cost, C#/.NET will actually save you money in the long term.
So, in short, while PHP is just fine as a language and I use and abuse it every day, I have a feeling that we will be seeing its twilight sooner rather than later, unless something like HPHP takes center stage, breaks backwards compatibility, and shakes up the ecosystem enough to revitalize the language.
It's now easier and faster to get up and running with JavaScript or even Ruby, and these languages have more internal consistency than PHP, meaning that long-term they will see more skilled developers using them and thus will eventually have more and better libraries than PHP.
In addition, the JVM has reached a point where languages like Scala can compete, and apart from the initial cost, C#/.NET will actually save you money in the long term.
So, in short, while PHP is just fine as a language and I use and abuse it every day, I have a feeling that we will be seeing its twilight sooner rather than later, unless something like HPHP takes center stage, breaks backwards compatibility, and shakes up the ecosystem enough to revitalize the language.