PHP taking_a_ref Exemples

Exemple #1

Fichier : references.php Projet : Halfnhav4/pfff

<?php

function foo($x)
{
    $x = $x + 10;
}
$y = 5;
foo($y);
echo $y, "\n";
$y = 5;
//ERROR: bad, passing reference where was expecting regular parameter
foo(&$y);
echo $y, "\n";
function taking_a_ref(&$x)
{
    $x = $x + 10;
}
$y = 5;
taking_a_ref(&$y);
//SKIP: not indicating a "pass-by-ref" at call site is bad, but skip cos too many
taking_a_ref($y);
//ERROR: keyword argument to reference parameter is bad
taking_a_ref($x = 2);

Exemple #2

Fichier : references.php Projet : nakyau/pfff

<?php

function foo($x)
{
    $x = $x + 10;
}
$y = 5;
foo($y);
echo $y, "\n";
$y = 5;
//ERROR: bad, passing reference where was expecting regular parameter
foo(&$y);
echo $y, "\n";
function taking_a_ref(&$x)
{
    $x = $x + 10;
}
$y = 5;
taking_a_ref(&$y);
//SKIP: not indicating a "pass-by-ref" at call site is bad, but skip cos too many
taking_a_ref($y);

Exemple #3

Fichier : ref_keywordarg.php Projet : Halfnhav4/pfff

<?php

function taking_a_ref(&$x)
{
    $x = $x + 10;
}
$x = 0;
taking_a_ref($x = 2);
// output = 2 ... insane
echo $x;
$x = 0;
taking_a_ref($x);
echo $x;
function taking_an_array_ref(&$x)
{
    $x[] = 'foo';
}
taking_an_array_ref($array = array());
// output is empty array, ... insane
var_dump($array);
$array = array();
taking_an_array_ref($array);
var_dump($array);