PHP make variable value part of another variable name

Question

I am trying to create a new variable out of part of another variables value. I have gone through multiple other SO threads but I am trying to figure out how to make the new variable its own instance. Making a variable out of another variables' value in php (php basics)

I have this variable: $id = 0 ;

I want to create: $limit_$id (IE: $limit_0) that I can reference just as native variable. I believe I can do this: $${'limit_'.$id}, but is there any way to actually end up with $limit_0 so I don't have to reference it as $${'limit_'.$id) ???

This is a bit of a code smell. You're likely better off just using an array, like $limit[$id]. — Alex Howansky
– Alex Howansky, Commented Aug 23, 2023 at 22:47
@rolinger The request seems to make no sense: if you already know the final name of the variable, you don't need to compose it with other variables. — TUPKAP
– TUPKAP, Commented Aug 23, 2023 at 22:52

lombervid · Accepted Answer · 2023-08-23 22:58:42Z

2

What do you mean by "reference it as $${'limit_'.$id)"?

You can do something like:

$id = 0;

${'limit_' . $id} = 'foo';

echo $limit_0; // foo

But, as someone already pointed out in a comment: if you already know the name of the final variable, you can just define it directly with that name.

answered Aug 23, 2023 at 22:58

lombervid

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Stas Trefilov · Accepted Answer · 2023-08-23 22:49:34Z

1

You can use the form ${"limit_$id"}, but it's a variation of what you already proposed:

<?php
$id = 1;
$limit_1 = 42;
echo ${"limit_$id"}, PHP_EOL;
${"limit_$id"} = 43;
echo ${"limit_$id"}, PHP_EOL;

answered Aug 23, 2023 at 22:49

Stas Trefilov

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