Using $_GET in PHP with strings

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$_get not working

Passing the value of 'false' into the $_GET Parameter. However, PHP does not seem to recognize this as a string since the following does not work:

$SINGLE = $_GET['SINGLE'];

if ($SINGLE == 'false'){
    echo 'HELLO';
}

I am guessing that I have to do some converting or casting, but I have not been successful.


So issue number one is you will return an undefined index error that looks like this.

Notice: Undefined index: SINGLE in E:\XAMPP\htdocs\test\test.php on line 2

To resolve this you need to do the following block:

if(isset($_GET['SINGLE'])) {
    $SINGLE = $_GET['SINGLE'];
}

Reason for this is that PHP needs to verify that the $_GET essentially exists and well... is set. If there is no check code block, you will return undefined every single time.

Secondly, as people stated in the comments, you would not be putting false in quotes true/false are BOOLEANS. When you wrap them in quotes, it makes it a string. It's the same thing with numbers:

1 is different from '1'. Once you wrap it in quotes, it is a string. So if your $_GETvalue is truly a BOOLEAN you would check it like this:

if(isset($_GET['SINGLE']) && $_GET['SINGLE'] == false) {
    $SINGLE = $_GET['SINGLE'];
} else {
    // other code here to execute if needed
}

Now if $_GET IS NOT a boolean and a string, you can check it like above and add an extra check as such:

if(isset($_GET['SINGLE']) && !empty($_GET['SINGLE'])) {
    $SINGLE = $_GET['SINGLE'];
} else {
    // other code here to execute if needed
}

I hope this helps you with what you are trying to achieve!

Get URL query string parameters, echo 'You can also have embedded newlines in strings this Example of string spanning multiple lines using nowdoc syntax. Backslashes $_expr = '_expr'; PHP automatically populates the $_GET superglobal by parsing the query string of the HTTP request, and every scalar value in $_GET will be a string. It's possible for it to have some array structure with complex query strings, but inside the arrays everything will be a string.


tis better to make sure $_GET['SINGLE'] is exist or not at first:

if(isset($_GET['SINGLE'])) {
   $SINGLE = $_GET['SINGLE'];
    if ($SINGLE == 'false'){ // IF AS STRING
      echo 'HELLO STRING';
    }
    if ($SINGLE == false){ // IF AS BOOLEAN
      echo 'HELLO BOOLEAN';
    }
} else {
   // if not exist 
}

PHP tutorial: Query string, $_SERVER['QUERY_STRING'] contains the data that you are looking for. The PHP way to do it is using the function parse_url, which parses a URL and return its components. Including the query string. The function parse_str() automatically reads all query parameters into an array. Description. An associative array of variables passed to the current script via the URL parameters (aka. query string). Note that the array is not only populated for GET requests, but rather for all requests with a query string.


If your php file contains just the code example in your question, like this:

yourfile.php

<?php

$SINGLE = $_GET['SINGLE'];

if ($SINGLE == 'false'){
    echo 'HELLO';
}

You can get it to echo HELLO by accessing the file with this URL:

http://yourhost/pathto/yourfile.php?SINGLE=false

Keep in mind this is case sensitive. The case of the url parameter must match the case of the key in $_GET.

You don't need to do any type conversion for this to work.

PHP automatically populates the $_GET superglobal by parsing the query string of the HTTP request, and every scalar value in $_GET will be a string. It's possible for it to have some array structure with complex query strings, but inside the arrays everything will be a string. There seems to be some confusion because you used the string 'false', but there will never be a boolean in $_GET unless you explicitly put it there in your PHP code with $_GET['SINGLE'] = false;.

PHP does not do any automatic conversion of strings to booleans if they happen to contain 'true' or 'false', and if you try to explicitly cast them they will both evaluate to true.

$example = (bool) 'false';
var_dump($example);   // bool(true)

How get value from URL, 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. PHP: Get the full query string. This is a tutorial on how to get the FULL query string as a string using PHP. Most people are aware of how to retrieve URL parameters using the $_GET array .


", the parameters "subject" and "web" are sent to "test_get. An alternative, and perhaps more useful, way is to use HTML forms. The main thing to remember with forms is that you need to use the GET method to send information via the query string, for example: <form method= "GET" action=


While using this site, you agree to have read and accepted our terms of use, cookie and privacy policy. Copyright 1999-2020 by Refsnes Data. All Rights Reserved  PHP/SQL - Issue with using two $_GET statements? Tag: php , sql I am trying to use two different $_GET statements (within the first two chunks of code) and then pass their values into a SQL statement (in the third chunk of code), however it is incorrectly working out for me.


Approach: Parse the URL string using parse_url() function which will return an associative array that contains its (passed URL) various components. The query of  Teams. Q&A for Work. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.