在PHP中调用函数后，在字符串中混合变量

Question

I want to mix a variable after call a function, but not when I set the variable.

My example code:

<?php

$greeting = "hi! {$gbye}";

function greetings() {
    global $greeting;
    $gbye = "goodbye!";
    return $greeting;
}

echo greetings();

?>

Fiddle: http://phpfiddle.org/main/code/kd5w-p7q4

I tried escaping the $ symbol: \$, but this only gives me the complete text. And replacing the escaped symbol make the same.

The $gbye variable is inside a language file, by this reason, I have to save the word ($gbye) until I call the function (to replace it as if the full string ($greeting = "hi! {$gbye}";) was inside the function). It's just an example.

So what can I do?

Answer 1

For language file usage, you may want to use your own meta keyword, instead of php variable syntax. This is ensure what you want to do is seperated from what PHP wants to do. This will save you from future bugs and maintenance effort. For example,

<?php

$greeting = "hi! #gbye#";

function greetings() {
    global $greeting;
    return str_replace("#gbye#", "goodbye!", $greeting);
}

echo greetings();

?>