PHP包含/ require内部函数

Question

Having functions that are quite big and they are loading every time the page is loaded, would be better to write function foo(){ include(.../file_with_function's_code); return; } to minimize the size of the functions script? Or it doesn't matter because when a function is loaded (but not executed) also is loaded the content even if it is into an include? Thank you.

(Edit: my question is not about if it's possible or not)

Answer 1

While @Luceos answer is technically correct (the best kind of correct), it does not answer the question you asked, namely is doing this better, or do includes happen regardless of function calls?

I tested this in the most basic way (OP, why didn't you?):

<?php
echo "Testing...";

function doThing() {
    include nonExistantFile.php;
}
//doThing();
echo "Done testing.";

Results:

if I call doThing(); I get a file not found warning.

If I comment out doThing();... there is no error! So you can save file load time by doing this.