You are looking in the wrong place. Look in /usr/ports, not in /usr/ports/lang/php. You are looking only at scaffolding, and only a small piece of the scaffolding -- the house is elsewhere.
You will find three structures in /usr/ports consume the largest amount of disk space:
- Distribution files. This is the source code to your port and all of its dependencies.
- Package files. Those that you are building, which are exactly the same as what you will find on your nearest mirror.
- Object files. The code that is built as each dependency is compiled.
Quote:
Does compiling php5 really use up that much space when compiling?
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You haven't started building php5 yet, you are still building its vast array of dependencies.
Please read FAQ 15.4.6. Again.