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Do you know what php uses to collect form data?

醉折花枝作酒筹Original: 2021-08-02 15:13:142213browse

In the previous article, we learned about $_SERVER. If you need it, please read "Teach you how to play with $_SERVER". This time we will introduce to you the method of collecting form data in PHP. You can refer to it if necessary.

In PHP, "$_POST", "$_GET" and "$_REQUEST" are used to collect form information. But this time we will introduce "$_POST" and "$_GET" first. First, let's take a look at "$_POST".

Let’s look at a small case first.

<!DOCTYPE html>
<html>
<body>

<form method="post" action="<?php echo $_SERVER[&#39;PHP_SELF&#39;];?>">
Name: <input type="text" name="fname">
<input type="submit">
</form>

<?php 
$name = htmlspecialchars($_POST[&#39;fname&#39;]); 
echo $name; 
?>

</body>
</html>

The result is

Do you know what php uses to collect form data?

As you can see in this example, when we enter information in the input box and click submit , the information we just entered will appear on the page. Let's look at the code again and find that the method attribute value of the form tag is post, and "##" appears between "<?php " and "?>" #$_POST['fname']", presumably this is the reason why the form information appears on the page.

When the user submits form data by clicking the "Submit" button, the form data will be sent to the script file specified in the action attribute in the

tag. In this example, we specify a file to process form data. If you want another PHP file to handle this data, you can modify the specified script file name. Then, we can use the super global variable $_POST to collect the input field data in the form

Just like this, our guess is correct, $_POST is widely used to collect form data, in the HTML form tag Specify this attribute:

method="post".

$_POST has been introduced, let’s take a look at $_GET.

Let’s take a look at a small example. For example, we want to transmit this:

https://www.php.cn/php-ask-480717.html?id=10

The data we obtain is as follows

<?php
echo $_GET["id "];
//输出 10
?>

In this example, when we click on the a label When linked, it will automatically obtain the specified data. The message with id=10 is passed to the specified page through the address get method. In the specified page, data can be obtained through $_GET["id "]. Its actual function may be to read the article with ID 10 from the database.

Next let’s take a look at $_GET in detail.

PHP $_GET is also widely used to collect form data. Specify this attribute in the HTML form tag:

method="get". Data sent in the URL can also be collected.

That’s all. If you want to know anything else, you can click here. → →

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