Robert Cummings wrote:
On Thu, 2007-11-29 at 12:13 +0000, Stut wrote:
Not ;). There is no such thing as a compile-time definition in PHP.
There certainly is...
<?php
if( !function_exists( 'file_put_contents' ) )
{
$def = <<<_
function file_put_contents
( \$filename, \$data, \$flags=0, \$context=null )
{
// :)
}
_;
eval( $def );
}
?>
Now, I'm not necessarily advocating this style of compatibility
programming, but I remember seeing something like it in PEAR. I think it
might have been the pear SOAP classes where the classes had to be
declared dynamically.
That's a runtime definition. It has to be. The function_exists function
*cannot* be "run" at compile-time to see what the result is, so it must
happen at runtime.
I think maybe the confusion is over terminology. In my mind Zend Studio
would not let me step through a compile-time process, but it's looking
likely that that's precisely what it's doing if I'm to believe
everything I'm reading.
Here's what I see when a file is included... I can step through each
function definition line (function ...), and at the same time it
executes any inline code outside of the functions. That seems like a
runtime process to me. If there is a function definition contained
within the file, or a function defined within a function, the debugger
does not hit that definition unless the condition matches or the
function is called.
To me this indicates that PHP defines entities at run time. It's
possible that it also defines them at compile-time, but I don't know the
internals well enough to know.
-Stut
--
http://stut.net/
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