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Request #70087 Better string interpolation
Submitted: 2015-07-16 11:52 UTC Modified: 2015-07-16 15:04 UTC
Votes:4
Avg. Score:3.0 ± 2.0
Reproduced:1 of 2 (50.0%)
Same Version:0 (0.0%)
Same OS:1 (100.0%)
From: mario dot dweller at seznam dot cz Assigned:
Status: Open Package: Strings related
PHP Version: 7.0.0beta1 OS:
Private report: No CVE-ID: None
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From: mario dot dweller at seznam dot cz
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 [2015-07-16 11:52 UTC] mario dot dweller at seznam dot cz
Description:
------------
There is a support for variable interpolation in strings like
`$string = "$a/$b $c";`
or
`$string = "{$a}/{$b} {$c}";`

But it is not usable for functions.
`$string = "Length: {strlen($a)}";`

I guess that's why many programmers prefer using sprintf instead because it is more readable than concatenation using dots. I personally use sprintf almost everywhere because the code looks more consistent then.

Since there are many cool new features in PHP7, why not to add this basic one?
I guess it would need a special syntax because of BC, or not?
But there are currently two ways to achieve the same thing:

`$string = "Hello {$a}";`
`$string = "Hello ${a}";`

The second one looks unnaturally, most prefer the first way. For example it could be forbidden in favor of this:

`$string = "Length is ${strlen(a)}";`



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 [2015-07-16 15:04 UTC] cmb@php.net
-Package: PHP Language Specification +Package: Strings related
 [2015-07-17 16:51 UTC] chrisdmiddleton at gmail dot com
I would also really like this feature, thanks Mario for bringing it up. In Mario's proposal, we would have to have a BC break, but here's a way that we could do it without a BC break. The following currently gives a parse error:

    echo "{$(time())}";

(Parse error: syntax error, unexpected '(', expecting variable ...)

So it could be implemented that arbitrary expressions would be allowed inside parentheses like that.

On a side note, I've found some very odd behavior in PHP 5.6.10, where I can use a function call inside variable interpolation, at least in a somewhat limited way. Is this documented behavior??

<?php
function foo () {
  echo "really";
}

echo "${foo()}"; // prints "really"
 [2015-07-17 16:58 UTC] chrisdmiddleton at gmail dot com
Never mind my previous question about function calls in variable interpolation. To answer my own question, I see that it is documented in the manual.
 
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