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How to use super global variables $_POST and $_GET

王林forward: 2020-08-04 17:31:442606browse

PHP $_POST is widely used to collect form data. Specify this attribute in the HTML form tag: "method="post".

PHP $_GET is also used Widely used to collect form data, specify this attribute in the HTML form tag: "method="get".

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Example:

The following example shows an input field (input) and submit button (submit ) form. When a user submits form data by clicking the "Submit" button, the form data is sent to the script file specified in the action attribute of the

tag.

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

<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 = $_POST[&#39;fname&#39;]; 
echo $name; 
?>
</body>
</html>

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$_GET can also collect the data sent in the URL.

Suppose we have a hyperlinked HTML page containing parameters:

<html>
<body>
<a href="test_get.php?subject=PHP&web=php.com">Test $GET</a>
</body>
</html>

When the user clicks on the link "Test $GET", the parameters "subject" and "web" will be sent to "test_get.php ",You can use the $_GET variable in the "test_get.php" file to get this data.

The following example shows the code of the "test_get.php" file:

<html>
<body>
 <?php 
echo "Study " . $_GET[&#39;subject&#39;] . " @ " . $_GET[&#39;web&#39;];
?>
 </body>
</html>

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