CODEWITHSUNDEEP
php
Biker John
Biker John

Reputation: 2711

Combining two reference variables

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];

}

Upvotes: 1

Views: 88

Answers (4)

Michael Di Prisco
Michael Di Prisco

Reputation: 406

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

Upvotes: 1

Hossam
Hossam

Reputation: 1146

You can get your required result by:

<?php

function more($first, $second){
    if(!empty($_GET['numof'])){
        if($_GET['numof']==1)
            return $first;
        elseif($_GET['numof']==2)
            return $first.':'.$second
    }
    return '';
}

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

foreach($results as $res) {
    $first = $res[0];
    $second = $res[1];
    echo more($first, $second).$res[3];
}

Upvotes: 0

Franz Gleichmann
Franz Gleichmann

Reputation: 3568

not directly, at least not that i know of. what you could do is create a class with a method that automatically combines the values. if you only want string output, you can use the magic method __tostring, so you can use the class directly:

class combiner
{
    private $a;
    private $b;
    public function __construct(&$a, &$b)
    {
        $this->a = &$a;
        $this->b = &$b;
    }
    public function __tostring() {
        return $this->a.":".$this->b;
    }
}

$ta = "A";
$tb = "B";
$combined = new combiner($ta, $tb);
echo $combined; //A:B
$ta = "C";
echo $combined; //C:B

Upvotes: 0

Gagan Prajapati
Gagan Prajapati

Reputation: 140

One thing you can do is the following : 

$ar = array(&$first, &$second);
$more = implode(":", $ar);

Upvotes: 1

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