"function_exists" Returns Nothing

[Deane]

Has anyone had experience with "function_exist s" not finding a function
that you KNOW you've defined? I have defined a function we'll call
"foo":

1. I know that function has been parsed, because code lower down the
script executes a function in the same include file.

2. The function name appears in the "get_defined_fu nctions" array.

3. If I just call the function (without bothering to check if it
exists), I get a return value, so the function is there.

4. if(function_exi sts('foo')) evaluates as false (so does
if(function_exi sts('foo') == true), for that matter)

5. print_r(functio n_exists('foo') ) prints nothing to the screen.

I've experimented with case to no success. function_exists is supposed
to be case-insensitive, but it doesn't seem to matter. The function
name is in lower case in get_defined_fun ctions, but looking for it with
any type of case doesn't matter -- it's just not found.

I have to be doing something wrong, but I can't figure out what.

Deane

[Philip Olson]

Re: "function_ exists" Returns Nothing

Try this code:

ini_set('displa y_errors', 1);
error_reporting (E_ALL);
if (function_exist s('foo')) {
echo "This function exists";
} else {
var_dump(functi on_exists('foo' ));
foo();
}

[Philip Olson]

Re: "function_ exists" Returns Nothing

Try this code:

ini_set('displa y_errors', 1);
error_reporting (E_ALL);
if (function_exist s('foo')) {
echo "This function exists";
} else {
var_dump(functi on_exists('foo' ));
foo();
}

[Deane]

Re: "function_ exists" Returns Nothing

It returns nothing. I tried your code and go nothing. So I set the
error reporting to the strictest level I possible could, and just did
this:

var_dump(functi on_exists('foo' ));

Nothing. I even had to a put a die() right after it to make sure
var_dump executed. It seems that function_exists is
returning...not hing. Not even a false.

Deane

[Philip Olson]

Re: "function_ exists" Returns Nothing

Then it's something else as var_dump() will always print something
here. Always.

My gut tells me that the display_errors directive is off in php.ini and
a fatal error exists. In this case, display_errors cannot be set at
runtime and you'll get a blank page.

[Deane]

Re: "function_ exists" Returns Nothing

Well, I upgraded the PHP version to 4.3.11 and var_dump is now
returning something from function_exists -- but it's false.

I'm at a roadblock here. function_exists refuses to accept that the
function is there, even though every other indicator comes back true.

I think I'm just going to hack up a user function that does an
array_search on get_defined_fun ctions, ugly as that sounds.