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18 years ago

One interesting thing I found out: You can concatenate variables and use spaces. Concatenating constants and function calls are also possible.



<?php

define('ONE', 1);

function one() {

    return 1;

}

$one = 1;



${"foo$one"} = 'foo';

echo $foo1; // foo

${'foo' . ONE} = 'bar'; 

echo $foo1; // bar

${'foo' . one()} = 'baz';

echo $foo1; // baz

?>



This syntax doesn't work for functions:



<?php

$foo = 'info';

{"php$foo"}(); // Parse error



// You'll have to do:

$func = "php$foo";

$func();

?>



Note: Don't leave out the quotes on strings inside the curly braces, PHP won't handle that graciously.

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