Two variable variables in one variable

Question

I have a for-loop ($x++) within another for-loop ($i++) , and I want both $x AND $i to be part of a variable variable:

${'name'.$x.'place'.$i.''} = ...;

Such that I get:

$name1place1
$name1place2
$name1place3
$name2place1
$name2place2
$name3place1 etc. etc.

However, setting variables in the way quoted above does NOT work for me (i.e. with single quotations and two variable variables). I get the error "Notice: Undefined variable [...]".

The following works:

${"name$x"} = ...;

(using double quotations and just one variable variable.)

How can I set variable variables with both $x and $i within the variable name? Thank you!

Which PHP version? The code you provided does work on PhpFiddle. — Bart Friederichs, Dec 06 '18 at 21:27
`${"name".$x."place".$i} = "test";` - _BUT_ just don't do that. Use an array. — Jeff, Dec 06 '18 at 21:40

score 2 · Accepted Answer · answered Dec 07 '18 at 04:27

You can do this by using curly braces within your variable name assignment to separate $x from the place:

$x = 4;
$i = 5;
${"name{$x}place{$i}"} = "test";
echo $name4place5;

Output:

test

However it would really make a lot more sense to just use an array:

$name[$x][$i] = "test2";
echo $name[$x][$i];

Demo on 3v4l.org

Two variable variables in one variable

1 Answers1