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I understand that there needs to be no output beforeheader () even a space.
I have the below code to get the current URL:
$url = 'https://' . $_GET['SERVER_NAME'] . $_GET['REQUEST_URI']
If I useheader ( "Location: $url" ) on the first line of the page, I think it might cause an infinity redirecting loop?
But what if I put it in a function and call it when a form is submitted like the below?
<form><input type="submit"></form>
<?php
$url = 'https://' . $_GET['SERVER_NAME'] . $_GET['REQUEST_URI']
function send () {
header ( "Location: $url" );
}
?>
Note that the function is after the HTML butheader () is in a function. Remember there needs to be no output beforeheader (), so will this work, and does it cause an error?
Because if it's not in a function, assume it looks like this, for sure it gonna cause an error, right?
<form><input type="submit"></form>
<?php
$url = 'https://' . $_GET['SERVER_NAME'] . $_GET['REQUEST_URI']
header ( "Location: $url" );
?>
This will fail, because the header() command does not run when you submit the form, even if you place it inside a JavaScript function.
PHP always runs on the server, not in the client. Everything it does happens before the client sees the response.
Header() must come first because it is a function like echo() that adds to the response that is sent to the client. Think ofheader ( "Location: $url" ); as being similar toecho "Header: Location: $url"; that just adds on to whatever else you have already written out for the page. (It isn't really an echo since it writes headers outside of the page body)
Note that you can have php code that does not generate output before a header() command. This is fine:
<?php
$person = "Tad Person";
$address = "100 Place Lane";
if ($person == "Tad Person")
{
header('Location: tads_own_page.php');
exit;
}
// else: the page for everyone except tad
....
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
JavaScript is a multi-paradigm language that supports event-driven, functional, and mandatory (including object-oriented and prototype-based) programming types. Originally JavaScript was only used on the client side. JavaScript is now still used as a server-side programming language. To summarize, we can say that JavaScript is the language of the Internet.
https://www.javascript.com/
HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet.
Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone.
https://www.w3.org/html/
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