php:函數間的參數傳遞
1.值傳遞
復制代碼 代碼如下:
<?php
function exam($var1){
$var1++；
echo "In Exam:" . $var1 . "<br />";
}
$var1 = 1;
echo $var1 . "<br />";
exam($var1);
echo $var1 . "<br />";
?>
-------------------------------------------------------------------------------
輸出結果：
1
In Exam: 2
1
-------------------------------------------------------------------------------
2.引用傳遞
復制代碼 代碼如下:
<?php
function exam( &$var1){
$var1++；
echo "In Exam:" . $var1 . "<br />";
}
$var1 = 1;
echo $var1 . "<br />";
exam($var1);
echo $var1 . "<br />";
?>
-------------------------------------------------------------------------------
輸出結果：
1
In Exam: 2
2
-------------------------------------------------------------------------------
3.可選參數
復制代碼 代碼如下:
function values($price, $tax=""){
$price += $prive * $tax;
echo "Total Price:" . $price . "<br />";
}
values(100, 0.25);
values(100);
輸出結果：
Total Price: 125
Total Price: 100
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4.如果傳入的是一個對象，可以更改該對象的值
（實際上變量$obj記錄的是這個對象的句柄，將$obj作為參數傳入，完全可以對原對象進行操作。）
復制代碼 代碼如下:
<?php
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 . " " . $this->gander . "<br />";
}
}
function grow($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();
?>
-------------------------------------------------------------------------------
輸出結果：
Mr. zhan 12 male
Mr. zhan 13 male
Mr. zhan 14 male
