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What is a POST request in php? how to use?

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2023-03-21 09:36:093697browse

In web development and creating dynamic websites, collecting and processing user input data is very important. Through the POST method, we can send large amounts of data to the server and receive responses from the server. In this article, we will take an in-depth look at the usage and steps of POST request in PHP.

1. What is a POST request?

POST is an HTTP method used to send data from the client to the server. Using the POST method to send data, you can send large amounts of data and the data is safe because the POST request includes the data in the HTTP request body instead of making it visible in the URL. Additionally, POST requests are suitable for interacting with the server and updating, deleting, or adding data.

2. POST request in PHP

In PHP, use the POST method to process data by accessing the $_POST super global variable. The $_POST array contains all data sent to the server with the POST method. Here are the simple steps to use POST request:

1. Create HTML form: We need to create an HTML form to collect user input data.

2. Set the "method" attribute of the form to "POST": the method attribute is used to specify the HTTP method for sending form data. Requires the use of "POST".

3. Specify the value of the "action" attribute on the form: The action attribute is used to specify the URL for form data submission. In this example, we specify the path where the php file is located.

4. Access form data using PHP code: We can access the data submitted with POST method and then save it into variables for further processing.

The following is a simple example: 

<!DOCTYPE html>
<html>
   <head>
      <title>PHP POST Example</title>
   </head>
   <body>
      <form method="post" action="process.php">
         Name: <input type="text" name="name"><br>
         Email: <input type="text" name="email"><br>
         <input type="submit" value="Submit">
      </form>
   </body>
</html>

In this example, we have created an HTML form that will be used to collect data and send the data to the process.php file . The form contains two text input fields: name and email. Now we need to create a process file (process.php) to process the form data. 

<!DOCTYPE html>
<html>
   <head>
      <title>PHP POST Example</title>
   </head>
   <body>
      <?php 
         if(isset($_POST[&#39;name&#39;]) && isset($_POST[&#39;email&#39;])) {
            $name = $_POST[&#39;name&#39;];
            $email = $_POST[&#39;email&#39;];
            echo "<h2>Hello $name</h2>";
            echo "<h3>Your email is $email</h3>";
         }
      ?>
   </body>
</html>

In this example, we check if the 'name' and 'email' keys in the $_POST array exist, if they exist, we use the $_POST variable to assign the values ​​to the variables $name and $email. We then insert the variables into the output statement so that it is displayed on the browser.

Please note that in order to display the output in the browser, we need to run the PHP code on the server. We can use local server tools like XAMPP or WAMP, or upload the code to a hosted web server.

Summary

In this article, we discussed in depth the concepts and basic usage of POST requests in PHP. Using the POST method, we can send data to the server through the client, and then process the data on the server side. By using the $_POST array we can easily access the data sent from the client to the server.

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