The problem is that each documentation has its own search function, more or less efficient, each with its own quirks. Search engines are much better at finding

The problem is that each documentation has its own search function, more or less efficient, each with its own quirks. Search engines are much better at finding information and they provide a consistent UI. You can search "php array sort", or "python array sort" and you'll get a link to the relevant page of the documentation. In comparison if I search for "array sort" in the Python doc directly, the first result is about "bisect" (vaguely related but too specific) and the second about "ctypes" (unrelated), the third is "Programming FAQ" (unrelated). Not one result is the generic "Sorting HOW TO" page, which Google links to first, and which is the most useful when you want to learn about sorting in Python.