<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Variable scope</title>
</head>
<body>
<?php
function doubleIt($number)
{
$number *= 2;
echo '$number is ' . $number . '<br>';
}
$number = 4;
doubleIt($number);
echo '$number is ' . $number;
?>
</body>
</html>
<!DOCTYPE HTML>
<html><head><meta charset="utf-8">
<title>Pass a variable by reference</title></head>
<body>
<?php
function doubleIt(&$number)
{
$number *= 2;
}
$num = 4;
echo '$num is ' . $num . '<br>';
doubleIt($num);
echo '$num is now: ' . $num;
?>
</body></html>
<?php
$number = 2;
// pass by value
// function doubleIt($number) {
// return $number *= 2;
// }
// pass by reference
function doubleIt(&$num)
{
$num *= 2;
}
$doubled = doubleIt($number);
echo '$doubled is ' . $doubled . '<br/>';
echo '$number is ' . $number . '<br/>';
var_dump($doubled);
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Return value</title>
</head>
<body>
<?php
function doubleIt($number)
{
return $number *= 2;
}
$num = 4;
$doubled = doubleIt($num);
echo '$num is: ' . $num . '<br>';
echo '$doubled is: ' . $doubled;
?>
</body>
</html>
<?php
$number = 2;
// Pass by value
/*function doubleIt($number) {
return $number *= 2;
}*/
// Pass by reference
function doubleIt(&$num)
{
$num *= 2;
}
$doubled = doubleIt(8);
echo '$doubled is ' . $doubled . '<br>';
echo '$number is ' . $number . '<br>';
var_dump($doubled);
<?php
require_once './namespace.php';
require_once './namespace2.php';
require_once './namespace3.php';
use Oreilly\Php7\UpToSpeed\{Nouns\Language, Nouns\Operator, Verbs\Possess};
use Oreilly\Php7\UpToSpeed\Common\{DoSomething, const PIE, const LOCATION, function doubleIt, function cube};
$number = 4;
echo '<p>' . LOCATION . ' is a great place to live.</p>';
echo "<p>Twice {$number} is " . doubleIt($number) . ", but cubed, it's " . cube($number) . '.</p>';
$obj = new DoSomething();
echo '<p>Yum, ' . PIE . '!</p>';
