Re: Re: Header files in PHP

Jeffry Killen wrote: > On Aug 21, 2014, at 6:39 PM, Paul M Foster wrote: > >> In PHP, the mechanism used to include code from another file in the >> current one involves one of four calls: >> >> include() >> include_once() >> require() >> require_once() >> >> But over the years, I've read many comments about how each of these >> calls slows down PHP, some more than others. So my question was whether >> anyone had ever tested this mechanism against the way it's done in C (as >> above) to determine if one is faster than the others. > > As a commentary on this issue, it seems to me that one would have to look > at the source code that is compiled into the interpreter and see exactly > what the various include/require statements/functions actually do. With > out looking at that myself I am guess that the include/require functions > just establish a hard link to the included script files. > Just a guess. FWIW: the relevant source code is in Zend/zend_vm_execute.h line 2670ff[1]. [1] <http://lxr.php.net/xref/PHP_5_5/Zend/zend_vm_execute.h#2670> -- Christoph M. Becker