How to access a variable variable with a name containing spaces?

Question

How does PHP handle something like this:

$blah = "Testing a variable"; 
$$blah = "test";

What would I access my dynamically declared variable?

mmk k, so something like.. $blah = str_replace(" ", "_", $blah); would work sufficiently. — Dalton Conley
– Dalton Conley, Commented Dec 22, 2010 at 17:41
$$ is one of the true evils/joys of PHP. combine with () for fun-ness! $$blah()(); — DampeS8N
– DampeS8N, Commented Dec 22, 2010 at 17:42
The one where you are coding for fun on your own? It is like coding in brainfuck. Joy. — DampeS8N
– DampeS8N, Commented Dec 22, 2010 at 18:18

Rafe Kettler · Accepted Answer · 2010-12-22 17:41:59Z

9

Everything you need to know about variable variables at http://www.php.net/manual/en/language.variables.variable.php, except for one thing: don't use them.

answered Dec 22, 2010 at 17:41

Rafe Kettler

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2 Comments

Dalton Conley Over a year ago

-1 for giving me a link to the manual, +1 for giving me some useful syntax advice.

Rafe Kettler Over a year ago

@Stephen I know, right? The manual explains variable variables way better than most people here could.

webbiedave · Accepted Answer · 2010-12-22 17:44:32Z

4

echo ${'Testing a variable'};

However, you don't want to do this in practice. It makes for unmaintainable, bug-prone code.

answered Dec 22, 2010 at 17:44

webbiedave

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Comments

zsalzbank · Accepted Answer · 2010-12-22 17:42:02Z

1

The variable $blah must contain a valid variable name.

This will tell you about variables: http://www.php.net/manual/en/language.variables.basics.php

answered Dec 22, 2010 at 17:42

zsalzbank

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DampeS8N · Accepted Answer · 2010-12-22 17:53:21Z

0

Not really an answer, but...

<?php 
function I_love_you()
{
    return "haha";
}

$haha = "HoHoHo";
$tom = "I_love_you";
$blah = "tom";

echo ${$$blah()};
?>

answered Dec 22, 2010 at 17:53

DampeS8N

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