php函数间的参数传递(值传递/引用传递)_php技巧

php:函数间的参数传递

1.值传递

 <BR><?php <BR>function exam($var1){ <BR>$var1++； <BR>echo "In Exam:" . $var1 . "<br />"; <BR>} <br><br>$var1 = 1; <BR>echo $var1 . "<br />"; <BR>exam($var1); <BR>echo $var1 . "<br />"; <BR>?> <BR>

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输出结果：
1
In Exam: 2
1
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2.引用传递

 <BR><?php <BR>function exam( &$var1){ <BR>$var1++； <BR>echo "In Exam:" . $var1 . "<br />"; <BR>} <br><br>$var1 = 1; <BR>echo $var1 . "<br />"; <BR>exam($var1); <BR>echo $var1 . "<br />"; <BR>?> <BR>

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输出结果：
1
In Exam: 2
2
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3.可选参数

 <BR>function values($price, $tax=""){ <BR>$price += $prive * $tax; <BR>echo "Total Price:" . $price . "<br />"; <BR>} <br><br>values(100, 0.25); <BR>values(100); <BR>

输出结果：
Total Price: 125
Total Price: 100
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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。）

 <BR><?php <BR>class Obj{ <BR>public $name; <BR>public $age; <BR>public $gander; <BR>public function __construct($name, $age, $gander){ <BR>$this->name = $name; <BR>$this->age = $age; <BR>$this->gander = $gander; <BR>} <BR>public function show_info(){ <BR>echo $this->name . " " . $this->age . " " . $this->gander . "<br />"; <BR>} <BR>} <BR>function grow($obj){ <BR>$obj->age++; <BR>} <BR>function test(){ <BR>$obj = new Obj("Mr. zhan", "12", "male"); <BR>$obj->show_info(); <BR>grow($obj); <BR>$obj->show_info(); <BR>grow($obj); <BR>$obj->show_info(); <BR>} <BR>test(); <BR>?> <BR>

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输出结果：
Mr. zhan 12 male
Mr. zhan 13 male
Mr. zhan 14 male

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