Php variables/arrays

meghatronic · 15 Jul 2007 at 19:17

Is it possible to name an array based on two other variable names?

E.g.

$str1 . $str2 = = array();

So if strr1 = choc, str=cy, the array would be called "choccy"?

furnace · 15 Jul 2007 at 19:34

Nope, can't do that, unless there's some way to parse a string as code that I don't know of... but I doubt it. I'll feel silly if someone says you can, now... lol.

Why do you want to do that, anyway? (might be an alternative solution

)

meghatronic · 15 Jul 2007 at 19:41

furnace said:
Why do you want to do that, anyway? (might be an alternative solution )

As this isn't working:

Code:

$count = 0;
foreach ($arr_im_iname as &$id){
//blah blah blah
	foreach ($arr_im_iseq[$count] as &$id){
	echo $arr_im_iseq[$count][0];
	}
$count = $count +1;
}

Off out, will explain more late unless my flaw is obvious.

psyr33n · 15 Jul 2007 at 19:43

What context is this in? It shouldn't really be needed; if you are uncertain about the contents of $str1/2 it could prove hazardous and you may lose your bearings, and on the other hand if their contents are known or hard-coded in, you should know their names anyway.

furnace · 15 Jul 2007 at 19:58

Code:

$count = 0;
foreach ($arr_im_iname as &$id){
//blah blah blah
	foreach ($arr_im_iseq[$count] as &$id){
	echo $arr_im_iseq[$count][0];
	}
$count = $count +1;
}

Hrm, still a bit confused so might have to wait until you're back..!

This one will;
- Set i to 0
- For each item in $arr_im_name:
--- For each item in the array $arr_im_iseq[$i], put the items key (e.g. the "0" from "arr_im_iseq[$i][0]") in $key, and its value (eg the "7" in "arr_im_iseq[$i]=7") in $value
------ Echo the key and the value of this item
--- Add 1 to i

Code:

$i=0;

foreach ($arr_im_iname as $id){

	foreach($arr_im_iseq[$i] as $key=>$value){

		echo $key.": ".$value."<br>";

	}

	$i++;

}

Don't know if that helps! Will try later when you've explained more

psyr33n · 15 Jul 2007 at 20:02

Posting the array structure and your aim would be good.

Dj_Jestar · 15 Jul 2007 at 22:16

http://www.php.net/manual/en/language.variables.variable.php

Code:

$foo = 'bar';
$bar = 'Hello World';
echo $$foo;

output:

Code:

Hello World

Other examples:

Code:

echo ${$foo . $bar};
echo ${'foo' . 'bar'};

meghatronic · 16 Jul 2007 at 00:16

Dj_Jestar said:
http://www.php.net/manual/en/language.variables.variable.php

Code:

$foo = 'bar'; $bar = 'Hello World'; echo $$foo;

output:

Code:

Hello World

Other examples:

Code:

echo ${$foo . $bar}; echo ${'foo' . 'bar'};

Doh! I rewrote it now... cheers though!

Inquisitor · 16 Jul 2007 at 00:49

Why exactly would you want to dynamically name a variable?

meghatronic · 16 Jul 2007 at 01:07

Inquisitor said:
Why exactly would you want to dynamically name a variable?

I didn't really.. it was a lazy shortcut.

Settled it with simple multi-dimensional array.

Jaffa_Cake · 16 Jul 2007 at 02:06

Inquisitor said:
Why exactly would you want to dynamically name a variable?

I do this

Backend CMS system I am creating using the __construct function in a class and I only define one of the many classes.

$com_name = 'com_' . $this->comName;
${$com_name} = new $com_name;

It can come in use sometimes and is worth knowing

meghatronic · 16 Jul 2007 at 02:25

Jaffa_Cake said:
I do this

Backend CMS system I am creating using the __construct function in a class and I only define one of the many classes.

$com_name = 'com_' . $this->comName;
${$com_name} = new $com_name;

It can come in use sometimes and is worth knowing

Que?

Dj_Jestar · 16 Jul 2007 at 11:36

Polymorphism can make good use of variable variables. I prefer to keep it simple and just use a switch or similar. Readability is far more important to me.