如何组合变量和字符串以形成新变量？

Question

Is it possible to combine a variable and a string to a new variable and echo it?

I have the following string:

$string = '01001'

Trying something like:

$var = $_$string

Ultimately I want to end up with a var like $_01001 that I can print. So if I have a bunch of data like:

$_01001 = 'foo'; $_01002 = 'bar'; $_01003 = 'fooz'; $_01004 = 'barz';

So echo $_01001; would produce foo ... thanks in advance.

Answer 1

Yes you can use. have a look on below example:

$_01001 = 'foo';
$_01002 = 'bar';

$string1 = '01001';
$string2 = '01002';

echo ${"_$string1"};
echo ${"_$string2"};

Output: foobar

mode detail available at Variable of variable

Answer 2

$string = '01001';
$vals = [
    '01001' => 'foo',
    '01002' => 'bar',
    '01003' => 'fooz',
    '01004' => 'barz',
];
echo $vals[$string];   // produces "foo"

Yah, I know, boring and lacking magic. But readable maintainable code is often boring and magicless. Variable variables voodoo does exist in PHP but will just distract future readers/maintainers (including yourself 1+ weeks from now) from what you're really trying to do in your logic.