Php put and post

# Reading Request Data

Usually data sent in a POST request is structured key/value pairs with a MIME type of application/x-www-form-urlencoded . However many applications such as web services require raw data, often in XML or JSON format, to be sent instead. This data can be read using one of two methods.

php://input is a stream that provides access to the raw request body.

$rawdata = file_get_contents("php://input"); // Let's say we got JSON $decoded = json_decode($rawdata); 

$HTTP_RAW_POST_DATA is a global variable that contains the raw POST data. It is only available if the always_populate_raw_post_data directive in php.ini is enabled.

$rawdata = $HTTP_RAW_POST_DATA; // Or maybe we get XML $decoded = simplexml_load_string($rawdata); 

This variable has been deprecated since PHP version 5.6, and was removed in PHP 7.0.

Note that neither of these methods are available when the content type is set to multipart/form-data , which is used for file uploads.

# Reading POST data

Data from a POST request is stored in the superglobal

(opens new window) $_POST in the form of an associative array.

Note that accessing a non-existent array item generates a notice, so existence should always be checked with the isset() or empty() functions, or the null coalesce operator.

$from = isset($_POST["name"]) ? $_POST["name"] : "NO NAME"; $message = isset($_POST["message"]) ? $_POST["message"] : "NO MESSAGE"; echo "Message from $from: $message"; 
$from = $_POST["name"] ?? "NO NAME"; $message = $_POST["message"] ?? "NO MESSAGE"; echo "Message from $from: $message"; 

# Reading GET data

Data from a GET request is stored in the superglobal

(opens new window) $_GET in the form of an associative array.

Note that accessing a non-existent array item generates a notice, so existence should always be checked with the isset() or empty() functions, or the null coalesce operator.

Example: (for URL /topics.php?author=alice&topic=php )

$author = isset($_GET["author"]) ? $_GET["author"] : "NO AUTHOR"; $topic = isset($_GET["topic"]) ? $_GET["topic"] : "NO TOPIC"; echo "Showing posts from $author about $topic"; 
$author = $_GET["author"] ?? "NO AUTHOR"; $topic = $_GET["topic"] ?? "NO TOPIC"; echo "Showing posts from $author about $topic"; 

# Handling file upload errors

The $_FILES[«FILE_NAME»][‘error’] (where «FILE_NAME» is the value of the name attribute of the file input, present in your form) might contain one of the following values:

  1. UPLOAD_ERR_OK — There is no error, the file uploaded with success.
  2. UPLOAD_ERR_INI_SIZE — The uploaded file exceeds the upload_max_filesize directive in php.ini .
  3. UPLOAD_ERR_PARTIAL — The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.
  4. UPLOAD_ERR_NO_FILE — No file was uploaded.
  5. UPLOAD_ERR_NO_TMP_DIR — Missing a temporary folder. (From PHP 5.0.3).
  6. UPLOAD_ERR_CANT_WRITE — Failed to write file to disk. (From PHP 5.1.0).
  7. UPLOAD_ERR_EXTENSION — A PHP extension stopped the file upload. (From PHP 5.2.0).
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An basic way to check for the errors, is as follows:

 $fileError = $_FILES["FILE_NAME"]["error"]; // where FILE_NAME is the name attribute of the file input in your form switch($fileError)  case UPLOAD_ERR_INI_SIZE: // Exceeds max size in php.ini break; case UPLOAD_ERR_PARTIAL: // Exceeds max size in html form break; case UPLOAD_ERR_NO_FILE: // No file was uploaded break; case UPLOAD_ERR_NO_TMP_DIR: // No /tmp dir to write to break; case UPLOAD_ERR_CANT_WRITE: // Error writing to disk break; default: // No error was faced! Phew! break; > 

# Uploading files with HTTP PUT

(opens new window) for the HTTP PUT method used by some clients to store files on a server. PUT requests are much simpler than a file upload using POST requests and they look something like this:

PUT /path/filename.html HTTP/1.1 

Into your PHP code you would then do something like this:

 /* PUT data comes in on the stdin stream */ $putdata = fopen("php://input", "r"); /* Open a file for writing */ $fp = fopen("putfile.ext", "w"); /* Read the data 1 KB at a time and write to the file */ while ($data = fread($putdata, 1024)) fwrite($fp, $data); /* Close the streams */ fclose($fp); fclose($putdata); ?> 

(opens new window) you can read interesting SO question/answers about receiving file via HTTP PUT.

# Passing arrays by POST

Usually, an HTML form element submitted to PHP results in a single value. For example:

pre>  print_r($_POST);?> pre> form method="post"> input type="hidden" name="foo" value="bar"/> button type="submit">Submitbutton> form> 

This results in the following output:

However, there may be cases where you want to pass an array of values. This can be done by adding a PHP-like suffix to the name of the HTML elements:

pre>  print_r($_POST);?> pre> form method="post"> input type="hidden" name="foo[]" value="bar"/> input type="hidden" name="foo[]" value="baz"/> button type="submit">Submitbutton> form> 

This results in the following output:

Array ( [foo] => Array ( [0] => bar [1] => baz ) ) 

You can also specify the array indices, as either numbers or strings:

pre>  print_r($_POST);?> pre> form method="post"> input type="hidden" name="foo[42]" value="bar"/> input type="hidden" name="foo[foo]" value="baz"/> button type="submit">Submitbutton> form> 

Which returns this output:

Array ( [foo] => Array ( [42] => bar [foo] => baz ) ) 

This technique can be used to avoid post-processing loops over the $_POST array, making your code leaner and more concise.

# Remarks

# Choosing between GET and POST

GET requests, are best for providing data that’s needed to render the page and may be used multiple times (search queries, data filters. ). They are a part of the URL, meaning that they can be bookmarked and are often reused.

POST requests on the other hand, are meant for submitting data to the server just once (contact forms, login forms. ). Unlike GET, which only accepts ASCII, POST requests also allow binary data, including file uploads

You can find a more detailed explanation of their differences here

# Request Data Vulnerabilities

Retrieving data from the $_GET and $_POST superglobals without any validation is considered bad practice, and opens up methods for users to potentially access or compromise data through code

(opens new window) . Invalid data should be checked for and rejected as to prevent such attacks.

Request data should be escaped depending on how it is being used in code, as noted here

(opens new window) . A few different escape functions for common data use cases can be found in this answer

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Php difference in post and put

In CouchDB, you use GET to fetch data, POST to update data, PUT to insert data, and DELETE to delete data. The method is something from REST services, and this method is associated with editing content, as opposed to method that is for insert new content.

Basic difference between GET and PUT in PHP?

Apart from $_GET & $_POST in PHP, I have come across this for very first time. Somebody also told me just like GET & POST, there’s also a PUT and DELETE.

I just want a basic difference between these four, I already know about the some basic differences between GET & POST. Any external links will also be helpful.

GET — Requests a representation of the specified resource. Requests using GET should only retrieve data and should have no other effect. (This is also true of some other HTTP methods.)[1] The W3C has published guidance principles on this distinction, saying, «Web application design should be informed by the above principles, but also by the relevant limitations.»[11] See safe methods below.

POST — Submits data to be processed (e.g., from an HTML form) to the identified resource. The data is included in the body of the request. This may result in the creation of a new resource or the updates of existing resources or both.

PUT — Uploads a representation of the specified resource.

DELETE — Deletes the specified resource.

This, however, doesn’t really give you a feel for when to use PUT and DELETE. I found that one of the best ways to get my head round what they do was to tinker with CouchDB. If you’re not familiar with it, it’s a non-relational database that you access via HTTP.

In CouchDB, you use GET to fetch data, POST to update data, PUT to insert data, and DELETE to delete data. If you’d like to explore it, there’s a very good book about it at http://guide.couchdb.org/draft/. Going through http://guide.couchdb.org/draft/tour.html and http://guide.couchdb.org/draft/api.html may give you a good idea of how it works.

Difference between $POST and $_POST in PHP, One is a mistake and the other isn’t. $_POST is a superglobal whereas $POST appears to be somebody forgetting the underscore. It could also be

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