¿Cómo obtener parámetros de una cadena URL en PHP?

How to get parameters from an URL string in PHP?

parse_url () Function: The parse_url () function is used to return the components of a URL by parsing it. It parse an URL and return an associative array which contains its various components. parse_str () Function: The parse_str () function is used to parse a query string into variables.

Optional parameters are useful because they allow us to control how a function is executed if a certain parameter has been omitted from the function call. Example of a PHP function that has default arguments. Let’s take a look at the following example: The function above has one parameter called $sort.

But please, for the love of all kittens, don’t abuse this. What your script does is entirely up to you. URLs cannot magically cause Apache, PHP, or any other server component to take a certain behavior, but if you write your program such that a particular function can be executed, it’s certainly possible.

You cannot do this without adding special code to the PHP file itself to grab the name of the function from the URL and invoking it. There are several ways. One way would be to pass the function name as a GET Parameter, and depending on it’s existence you could call the function. You could also for security, check the HTTP Referrer.

– Basic HTML knowledge. – Basic PHP knowledge. A common and simple way of gathering data is through HTML Forms. Forms are containers for user input and can contain any number of different input types. action: this should point to the page that is meant to process the collected data.

PHP Write to File-fwrite() The fwrite() function is used to write to a file. The first parameter of fwrite() contains the name of the file to write to and the second parameter is the string to be written.

Using the POST the parameters are sent in the body of the request. Accordingly PHP has two separate ways to access these parameters. Via the $_GET and $_POST variables. In this example we have a small HTML snippet that makes the browser display an entry box and a button.

If the component parameter is specified, parse_url () returns a string (or an int, in the case of PHP_URL_PORT ) instead of an array. If the requested component doesn’t exist within the given URL, null will be returned.

Let’s take a look at a PHP script that retrieves GET data and displays the results as HTML. ‘Get’ data appears in your PHP script in an associative array called $GET. The following script shows how you can retrieve particular parameters using $ GET; we also iterate through the $_GET array and show all parameter values.

This function parses a URL and returns an associative array containing any of the various components of the URL that are present. The values of the array elements are not URL decoded.

How to get parameters from a URL string in PHP? To get parameters from a URL string in PHP, the code is as follows−

But it can come really handy when you want to pass a url with query string to a funtion that copies/downloads the file using basename as local filename, by attaching an extra query to the end of the url: Note: you can use the filename from the HTTP header (if present) to get the file with it’s original filename.

//Show filename, but cut off file extension for “.php” files echo basename($path,”.php”); The output of the code above will be: home.php home Definition and Usage The basename() function returns the filename from a path.

Although the PHP code will work, it does make the assumption that the GET parameters in question will always exist. As a result, there is always the possibility that our script will throw an ugly undefined index notice if a user manually or mistakenly removes one of our parameters from the URL.

The output produced is… Note that the 0th argument is the name of the PHP script that is run. The rest of the array are the values passed in on the command line. The values are accessed via the $argv array.

$_GET is not a function or language construct—it’s just a variable (an array). Try: In particular, it’s a superglobal: a built-in variable that’s populated by PHP and is available in all scopes (you can use it from inside a function without the global keyword).

What this does is, if someone visits http://example.com/search/test the URI that is really processed is http://www.example.com/search.php?q=test. Now, if I try to pass an extra random GET parameter to my rewritten URL, the parameter is ignored.

It uses PHP output buffer capture support to automatically process the URLs of the links and forms of the current page. An optional filter may be specified to restrict the URLs that are altered by the class. When the current page using the class is loaded, it decrypts the parameter variables and updates the respective global variables.

PHP command line FAQ: How do I read command line arguments in PHP? Answer: You just need to access the PHP argv array, as shown in this example: #!/usr/bin/php “; } ?>.

Create an URL object from the String. When first you have an URL object there are methods to easily pull out just about any snippet of information you need. I can strongly recommend the Javaalmanac web site which has tons of examples, but which has since moved. You might find http://exampledepot.8waytrips.com/egs/java.io/File2Uri.html interesting:

Replace baseURL with the form’s URL, variable1 with the variable associated with the field to be filled in and value with the appropriate field value. To fill in multiple fields, insert the ampersand symbol (&) before any additional variables:

UriBuilder buildURI = UriBuilder.fromUri (strUrl); URI uri = buildURI.build (); String fileName = Paths.get (uri.getPath ()).getFileName (); Here is the simplest way to do it in Android. I know it will not work in Java but It may help Android application developer.

The parse_url() function is an inbuilt functionin PHP which is used to return the components of a URL by parsing it. It parse an URL and return an associative array which contains its various components. Syntax: Parameters: This function accepts two parameters as mentioned above and described below:

The data passed through the URL can be retrieved in the destination page using the $_GET superglobal and by using the variable name as key Below is an example link joined with the query string ?name=Jim. If you click on it, the query string ?name=Jim will be found at the end of the URL.

When you work with PHP, you often need to pass variables from one page to another. This lesson is about passing variables in a URL. How does it work? Maybe you have wondered why some URLs look something like this:

This URL contains two variables: name and age. In the same way as above, you can get the variables like this: Let’s add the extra variable to the example: Now you have learned one way to pass values between pages by using the URL. In the next lesson, we’ll look at another method: forms.

If you want to get the $url dynamically with PHP, take a look at this question: All the parameters after ? can be accessed using $_GET array. So, will extract the emails from urls. This isn’t the answer to the question, but this is the answer I was looking for when I asked the Googles for the question, so +1 for answering Google correctly.

On seriously malformed URLs, parse_url () may return false . If the component parameter is omitted, an associative array is returned. At least one element will be present within the array.

Just need to know in PHP how to say, if the url param exists grab it and do the if function, if it doesn’t exist do nothing. EDIT : This is added for the completeness sake. $_GET in php is a reserved variable that is an associative array. Hence, you could also make use of ‘array_key_exists (mixed $key, array $array)’.

Definition and Usage. The empty () function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true. The following values evaluates to empty: 0. 0.0. “0”. “”. NULL.

Remember that header () must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP. It is a very common error to read code with include (), or require (), functions, or another file access function, and have spaces or empty lines that are output before header () is called.

You should also check all input, especially if it is sent using GET. ie. make sure that $_GET [‘id’] is not NULL or == “”, is a number that is positive, not 0 (generally, I know this doesn’t apply to some table types, but it applies to the default) and is within the valid range for that field. Just don’t trust ANY data that is sent to your script.

difference is that variable can be passed to file via url or via POST method. if variable is passed through url, then you can get it with $_GET [‘variable_name’] or $_REQUEST [‘variable_name’] but if variable is posted, then you need to you $_POST [‘variable_name’] or $_REQUST [‘variable_name’]

If the URL that you are trying to remove the query string from is the current URL of the PHP script, you can use one of the previously mentioned methods. If you just have a string variable with a URL in it and you want to strip off everything past the ‘?’ you can do:

All variables in querystrings need to be urlencoded to ensure proper transmission. You should never pass a user’s personal information in a url because urls are very leaky. Urls end up in log files, browsing histories, referal headers, etc.

There are few steps to get the complete URL of the currently running page which are given below: Create a PHP variable which will store the URL in string format. Check whether the HTTPS is enabled by the server .If it is, append “https” to the URL string. Append the regular symbol, i.e. “://” to the URL.

PHP_EOL; echo ‘ ‘ . PHP_EOL; You can pass a variable number of arguments to a function whilst keeping references intact by using an array. The disadvantage of course, is that the called function needs to be aware that it’s arguments are in an array.

In the example above, we use PHP’s isset function to check whether or not the parameter in question actually exists. If it does, we assign it to one of our variables. If it doesn’t, then our variables retain their default FALSE values. Never trust GET parameters as they are. Always validate them.

Generates a warning if called from outside of a user-defined function. Output previous to PHP 5.3: Output in PHP 5.3 and later: Because this function depends on the current scope to determine parameter details, it cannot be used as a function parameter in versions prior to 5.3.0.

The URL is in my case generated from a CMS so I don’t need any information about server variables. $url = strtok ($url, ‘?’); See about strtok here. Its the fastest (see below), and handles urls without a ‘?’ properly.

If the URL that you are trying to remove the query string from is the current URL of the PHP script, you can use one of the previously mentioned methods. If you just have a string variable with a URL in it and you want to strip off everything past the ‘?’ you can do: $pos = strpos ($url, “?”); $url = substr ($url, 0, $pos);

To get the current page URL, PHP provides a superglobal variable $_SERVER. The $_SERVER is a built-in variable of PHP, which is used to get the current page URL. It is a superglobal variable, means it is always available in all scope. If we want the full URL of the page, then we’ll need to check the protocol (or scheme name),

The PHP way to do it is using the function parse_url, which parses a URL and return its components. Including the query string. This is actually the best answer based on the question. The other answers only get the current URI whereas the question only specifies “from URL”. – Chris Harrison Aug 29 ’13 at 5:38