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If you`re familiar with C, require() is much like a `preprocessor directive`, more or less like C`s #include. That means that the file will be opened/parsed regardless of whether or not it`ll actually get executed. It`ll also be opened/parsed just once, so one require() statement may not be used to get more than one file. E.g. <? $files = array("foo","bar"); while (list(,$file)=each($files)) { require($file); } ?> will only open the file "foo". To be most accurate, the first time the require() statement is seen, it`s replaced with the contents of the file (in the above case, the file "foo") - and erased completely from the script. The next time PHP will run the loop, it won`t see a require() statement in there, but the contents of the file "foo". Another example: <? if (false) { require "foo"; } ?> This example will *also* open the file "foo", even though its contents will not be executed, much like if (0) { #include "foo" } in C. include(), on the other hand, is affected by the PHP control structures, and may be used to selectively include files or include multiple files. For example, in the above example, replacing require() with include() will yield the desired result: <? $files = array("foo","bar"); while (list(,$file)=each($files)) { include($file); } ?> Also, <? if (false) { include "foo"; } ?> will not even try to open the file "foo". Pros and cons - require() is faster and consumes a bit less memory. Whenever applicable - use it. However, if you actually want to selectively include files, or include multiple files within a loop - you`ll prefer include(). | |||||
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