Dynamic generation of "if" statements

[Arizpe]

Hi all,

I'm struggling with the creation of what I believe should be called
"dynamic if statement" in php. I don't know if such thing is possible.

I have a query string that might have several variables, say from one to
five, not always the same variables, and not always the same number of
variables.

I've managed to put the variable names and values in an array, and I'm
able to generate the conditions depending on the variables I have.

However I cannot modify the if statment depending on the variables I have.

For example if my query string has two variables I want to perform an if
statment similar to this:

if ( condition1 AND condition2)

but if the query string has three variables, then the if statement should
look like this:

if ( condition1 AND conditio2 AND condition3)

I've tried using switch(), case, but it doesn't work

Eval() Doesn't work either

This is an example of what I've triek

1. This is an example if statement that works:

if ($data[$var0] == $some_array[0] AND $data[$var1] == $some_array[1])

This doesn't work, I'd like to generate it through a variable:

$testString = "if (\$data[\$var0] == \$some_array[0] AND \$data[\$var1] == \$some_array[1])";

eval ($testString);

Any ideas or suggestions?

Thanks

Gustavo

[philipolson]

How about something like:

if (count($_GET) > 0) {
    foreach ($_GET as $name => $value) {
        if (empty($value)) {
            $empty[$name] = $value;
        } else {
            $full[$name] = $value;
        }
    }

} else {
    print "No get variables to check";
}

Seems odd but sounds similar to what you're trying to do. If $empty exists, you have some empty GET variables... Modify according to need.

[Arizpe]

Thanks, according to your answer now I have the name-value pairs in the array
$full[$name]=_$value;

But then, how can I generate an if statement based on the name value pairs?

For example, if I have two name-value pairs (count($_GET) equal to 2), the if statement I need generated should look similar to this:

if ($full[$var0] == some condition AND $full[$var1] == another condition])

But if I have three name-value pairs, then my if statement should be:

if ($full[$var0] == some condition AND $full[$var1] == another condition AND $full[$var3] == yet another condition)

The point is that, depending on the query string, the if statement should vary both in variables and number of conditions...

Any ideas?

Thanks again for your kind help.

Gustavo

[philipolson]

I wrote my example so you wouldn't need 'dynamic if statements'. If you want to check other conditions, do it inside that loop and base the conditions on the variable name. I don't think 'dynamic if statements' is the way to go, no need.

[xadmin]

Take a look at this thread. I think it sounds similar to what you want to do.

http://www.phpbuilder.com/board/showthread.php?s=&threadid=10214938

Hope that helps,

xadmin

[Arizpe]

Well, I know this isn't elegant programming, but I really depend on the code executed after the if statement it's a lot of code executed if the condition is true, hence I temporarily solved this with the following

//CODE TO GENERATE MY VARIABLES ...
...
...

//MORE CODE

...
...

$query_string_field_no = count($_GET);

if ($query_string_field_no == 1) {

	   if ($data[$var0] == $arreglo_variables_existentes[0])		{

	   include("despliegue_tabular.inc");

	   }
}

if ($query_string_field_no == 2) {

  if ($data[$var0] == $arreglo_variables_existentes[0] AND $data[$var1] == $arreglo_variables_existentes[1])			{

	  		include("despliegue_tabular.inc");

		   }
}

if ($query_string_field_no == 3) {

  if ($data[$var0] == $arreglo_variables_existentes[0] AND $data[$var1] == $arreglo_variables_existentes[1] AND $data[$var2] == $arreglo_variables_existentes[2])			{

	  		include("despliegue_tabular.inc");

		   }
}

...
...
...
// GO ON UNTIL $query_string_field_no = 10
...

if ($query_string_field_no == 10) {
..
}

---

despliegue_tabular.inc is a very long snippet of code.

It looks silly even to me that I'm not an experience programmer...

This would do the job, however. I would probably have to rewrite the code if I'd rather use something more elegant.

Maybe I'm just not getting how the $empty array would help me.

Thanks for your patience and time,

Gustavo