Question 236508 in PHP Question posted in
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PHP make variable value part of another variable name

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) ???

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3

Answers


  1. 0

    You could use extract ( https://www.php.net/manual/en/function.extract.php ) for those kind of things.

    extract(['limit_' . $id => 'foo']);

echo $limit_0; // foo
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  2. 0

    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;
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  3. 0

    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.

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