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67 lines
2.6 KiB
Markdown
67 lines
2.6 KiB
Markdown
+++
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title = "PHP HTTP Server"
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description = "Handling HTTP Requests in PHP"
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tags = ["php", "http", "server"]
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slug = "http-server"
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previous = "web/http-post.html"
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next ="web/php-html.html"
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In PHP, you usually use a separate web server program that accepts HTTP requests and passes them to PHP to create a response. Common examples of separate web server programs are Apache and Nginx. However, PHP has a built in web server we can use during development.
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To use the development web server, open a terminal and a new folder for holding your code. Create a file called `index.php` and put this PHP code in it:
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```php
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<?php
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echo 'Hello World!';
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```
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Go back to your terminal and start a PHP web server using this command:
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```bash
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php -S localhost:8080
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```
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Now, you can open `localhost:8080` in your web browser and you will see 'Hello World!' in the content of the page.
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Next, we can use PHP to analyze all the information about the HTTP request sent from the browser to your PHP script. Change your `index.php` to have this code:
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```php
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<?php
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$method = $_SERVER['REQUEST_METHOD'];
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$uri = $_SERVER['REQUEST_URI'];
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$protocol = $_SERVER['SERVER_PROTOCOL'];
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$headers = getallheaders();
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echo "$method $uri $protocol <br/>";
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foreach ($headers as $key => $header) {
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echo "$key: $header <br/>";
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}
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```
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Reload `localhost:8080` and you will see the main request line and all of the headers printed on the web page. The `<br/>` tag is HTML for a new line. Since we are outputting to a web browser, we can no longer use `"\n"` to create a new line.
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By default, PHP will generate the necessary response line and headers. If you open your browser console and open the network tab, you can see the response code and headers.
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```http
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HTTP/1.1 200 OK
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Host: localhost:8080
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Date: Sun, 28 Apr 2019 10:19:25 -0500
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Connection: close
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X-Powered-By: PHP/7.2.17
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Content-type: text/html; charset=UTF-8
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```
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PHP set the response code to `200 OK` and the content type to `text/html`. Even though PHP will output good defaults, we can change them in our code if we want. Update your `index.php` file with this code:
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```php
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<?php
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http_response_code(404);
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header('Content-Type: text/plain');
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echo "Not Found!";
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```
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We are changing the status code to `404 Not Found` and the content type to plain text. If you open `localhost:8080` in your browser, you will now see this HTTP response in your console:
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```http
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HTTP/1.1 404 Not Found
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Host: localhost:8080
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Date: Sun, 28 Apr 2019 10:26:40 -0500
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Connection: close
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X-Powered-By: PHP/7.2.17
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Content-type: text/plain;charset=UTF-8
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```
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PHP added the other necessary headers for the response, but this time used `404` in the main response line and set the `Content-type` header to `text/plain`.
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