结合两个参考变量

Question

Is it somehow possible to "glue" two reference variables?

For example

$more = &$first.':'.&$second;

Using this, i receive a syntax error, an unexpected &.

Full code

$numOf = isset($_GET['numof']) ? $_GET['numof'] : 'x';

if($numOf == 1) {

$more = &$first;

} else if($numOf == 2) {

$more = &$first.':'.&$second;

} else {

$more = '';

}

$results = array(); // array with results from database

foreach($results as $res) {

$first = $res[0];
$second = $res[1];

echo $more.$res[3];

}

Answer 1

You should use a Closure to achieve what you want. Indeed, you need PHP 7(Maybe 5.6, can't tell as I can't test) in order to achieve desired result. Here's an example:

<?php
$first = "a";
$second = "b";
$more = function(){ global $first,$second; return $first.$second; };

echo $more()."<br>"; // This will output ab
$first = "b";
echo $more(); // This will output bb