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php中$_GET,$_POST,$_REQUEST用法与区别分析

May 25, 2016 pm 04:50 PM
post request usage

1.$_REQUEST

默认情况下包含了 $_GET,$_POST 和 $_COOKIE 的数组,代码如下:

<?php
$_GET[&#39;foo&#39;] = &#39;a&#39;;
$_POST[&#39;bar&#39;] = &#39;b&#39;;
var_dump($_GET); // Element &#39;foo&#39; is string(1) "a"
var_dump($_POST); // Element &#39;bar&#39; is string(1) "b"
var_dump($_REQUEST); // Does not contain elements &#39;foo&#39; or &#39;bar&#39;

?>
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注:它的速度比其它的要慢一些

2.$_GET

$_GET 变量用于收集来自 method="get" 的表单中的值,从带有 GET 方法的表单发送的信息,对任何人都是可见的(会显示在浏览器的地址栏),并且对发送的信息量也有限制,最多 100 个字符。

实例代码如下:welcome.php?name=Peter&age=37

welcome.php" 文件现在可以通过 $_GET 变量来获取表单数据了,请注意,表单域的名称会自动成为 $_GET 数组中的 ID 键,代码如下:

Welcome <?php echo $_GET["name"];?> .<br /> 
You are <?php echo $_GET["age"];?>  years old!
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注:数据量不能过大最多只能100个字符或2kb

3. $_POST

$_POST 变量是一个数组,内容是由 HTTP POST 方法发送的变量名称和值。

$_POST 变量用于收集来自 method="post" 的表单中的值。从带有 POST 方法的表单发送的信息,对任何人都是不可见的(不会显示在浏览器的地址栏),并且对发送信息的量也没有限制,代码如下:

<form action="welcome.php" method="post"> 
Enter your name: <input type="text" name="name" /> 
Enter your age: <input type="text" name="age" /> 
<input type="submit" /> 
</form>
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selcome.php文件,代码如下:

Welcome <?php echo $_POST["name"];?> .<br /> 
You are <?php echo $_POST["age"];?>  years old!
Copy after login

注:比get要好很多数据处理量大同时大多用于表单,三区别在于$_REQUEST可以获取$_GET和$_post的数据,但是效率相对于前二者是要慢些,为什么慢我想大家用脚指都能想明白的,这里就留下大家思想吧。

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