Static variable string parsing in PHP

Question

Pretty straightforward; I've read through the docs but perhaps I'm just a tad confused by the explanation.

class Test{
    public static $var = 'world';
}

echo "hello {Test::$var}"; // only parses $var in current scope, which is empty

Is there any way to achieve the desired functionality here? I'm starting to guess no, as I've tried a number of permutations with no success.

Clarification: I'm trying to achieve this with PHP's variable parsing, not concatenation. Obviously I'll resort to concatenation if the desired method is not possible, though I'm hoping it is.

mario · Accepted Answer · 2011-05-08 20:44:42Z

9

Variable parsing in PHPs double quoted strings only works for "variable expressions". And these must always start with the byte sequence {$. Your reference to a static identifier however starts with {T hencewhy PHP parses towards the next $ in your double quotes and ignores Test::

You need to utilize some cheat codes there. Either use a NOP wrapper function:

$html = "htmlentities";
print "Hello {$html(Test::$var)}";

Or pre-define the class name as variable:

$Test = "Test";
print "Hello {$Test::$var}";

I'm afraid there's no native way to accomplish this otherwise.

answered May 8, 2011 at 20:44

mario

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1 Comment

Dan Lugg Over a year ago

Thanks mario; I was afraid of that; the lack of native support for my desired functionality. I'll have to hack around to get something close.

Community · Accepted Answer · 2017-05-23 12:32:56Z

1

This works with the string concatenation operator ( . )

echo "hello ".Test::$var;

EDIT

Note: Functions, method calls, static class variables, and class constants inside {$} work since PHP 5. However, the value accessed will be interpreted as the name of a variable in the scope in which the string is defined. Using single curly braces ({}) will not work for accessing the return values of functions or methods or the values of class constants or static class variables.

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edited May 23, 2017 at 12:32

CommunityBot

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answered May 8, 2011 at 20:23

Gazler

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2 Comments

Dan Lugg Over a year ago

Thanks Gazler; I don't want concatenation though, trying to take advantage of variable parsing.

Gazler Over a year ago

I do not believe that is possible. Please see this question: stackoverflow.com/questions/1267093/… Especially the link posted as the top answer, which I have quoted in my edits.

judda · Accepted Answer · 2011-05-08 20:22:53Z

0

You can always break the echo up into the smaller pieces.

class Test{
    public static $var = 'world';
}

echo "hello ", Test::$var;

answered May 8, 2011 at 20:22

judda

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