php:函数间的参数传递
1.值传递
复制代码 代码如下:
function exam($var1){
$var1++；
echo "In Exam:" . $var1 . "
";
}
$var1 = 1;
echo $var1 . "
";
exam($var1);
echo $var1 . "
";
?>
-------------------------------------------------------------------------------
输出结果：
1
In Exam: 2
1
-------------------------------------------------------------------------------
2.引用传递
复制代码 代码如下:
function exam( &$var1){
$var1++；
echo "In Exam:" . $var1 . "
";
}
$var1 = 1;
echo $var1 . "
";
exam($var1);
echo $var1 . "
";
?>
-------------------------------------------------------------------------------
输出结果：
1
In Exam: 2
2
-------------------------------------------------------------------------------
3.可选参数
复制代码 代码如下:
function values($price, $tax=""){
$price += $prive * $tax;
echo "Total Price:" . $price . "
";
}
values(100, 0.25);
values(100);
输出结果：
Total Price: 125
Total Price: 100
-------------------------------------------------------------------------------
4.如果传入的是一个对象，可以更改该对象的值 （实际上变量$obj记录的是这个对象的句柄，将$obj作为参数传入，完全可以对原对象进行操作。）
复制代码 代码如下:
class Obj{
public $name;
public $age;
public $gander;
public function __construct($name, $age, $gander){
$this->name = $name;
$this->age = $age;
$this->gander = $gander;
}
public function show_info(){
echo $this->name . " " . $this->age . " " . $this->gander . "
";
}
}
function grow($obj){
$obj->age++;
}
function test(){
$obj = new Obj("Mr. zhan", "12", "male");
$obj->show_info();
grow($obj);
$obj->show_info();
grow($obj);
$obj->show_info();
}
test();
?>
-------------------------------------------------------------------------------
输出结果：
Mr. zhan 12 male
Mr. zhan 13 male
Mr. zhan 14 male
http://www.bkjia.com/PHPjc/313595.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/313595.htmlTechArticlephp:函数间的参数传递 1.值传递 复制代码 代码如下: ?php function exam($var1){ $var1++； echo "In Exam:" . $var1 . "br /"; } $var1 = 1; echo $var1 . "br /"; exam($v...
Was ist Funktion?
So öffnen Sie eine PHP-Datei
Verwendung der js-Funktionsfunktion
So entfernen Sie die ersten paar Elemente eines Arrays in PHP
Was tun, wenn die PHP-Deserialisierung fehlschlägt?
So verbinden Sie PHP mit der MSSQL-Datenbank
So verbinden Sie PHP mit der MSSQL-Datenbank
So laden Sie HTML hoch
![[Web-Frontend] Node.js-Schnellstart](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
