Is This Possible?

[glenelkins]

Hi

 

Im writing an app and I would like to create a class with a name that is specified either in a database or a variable. Is this possible?

 

for example, can something like this be done?

 

$class_name = "test";

class $class_name {

}

 

This code doesnt work, but I was wondering if there was a way to do this?

 

Also, Iv seen many of times variables set like this in a string  echo "Hello my name is {$name}" ... what exactly are the {} for? they are not needed so why are they there?

 

Thanks

[thebadbad]

I don't know about the variable class name, but {} are required when you wanna access an array element with a string as key, within quotes:

 

<?php
$array = array('foo' => 'bar');
echo "foo{$array['foo']}";
?>

[thebadbad]

Another use is, when you wanna use the right variable:

 

<?php
$foo = 'bar';
$foobar = 'foobar';
echo "$foobar";
//foobar
echo "{$foo}bar";
//barbar
?>

[glenelkins]

ok so another one,

 

can a function be created like this: ?

 

$function  = "test";

$function() {

}

 

thebadbad, i dont see the point in your example, you could simply use echo "$array[foo]";

 

[thebadbad]

A third use is for variable variables:

 

<?php
$a = 'foo';
$b = 'bar';
$foobar = 'foo';
echo "${$a . $b} bar";
//foo bar
echo ${$a . $b} . ' bar';
//foo bar
?>

 

And I'm sure there's more..

 

To reply, yes, you can.

[glenelkins]

yes you can to what? the function?

[thebadbad]

echo "$array[foo]"; will throw a warning (if turned on). String keys should always be enclosed in quotes.

 

Yes, the function:

 

<?php
function test() {
echo 'test';
}

$name = 'test';
$name();
//test
?>

[glenelkins]

No you have what im saying wrong.

 

I know i can call a function like this

 

function test(){

}

 

$function = "test";

 

$function();

 

 

What im saying is can a function be "created" the same way? Like so:

 

$function_name = "test";

 

// Create the function

$function_name(){

 

}

[thebadbad]

Oh, sorry, my bad. Why don't you try?