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If-statement: how to pull 2nd GET variable

Answer 1

A:

First of all, a HTML element can only have one id. So if you want to create a hybrid (e.g. page-section) you can do something like this:

<body id="<?php echo isset($_GET['page']) ? $_GET['page'] : "home"; echo isset($_GET['section']) ? ("-".$_GET['section']) : ''; ?>">

For more information on Ternary Operators in PHP (the ? and : I used in the echo statement) see http://php.net/manual/en/language.operators.comparison.php

Voltin 2010-02-13 05:24:11

Answer 2

A:

Move the PHP code outside the body's id attribute for readability, and use else if. Make sure your code isn't vulnerable to injection by sanitizing or validating input from $_GET. For example:

<?php
    function isValidID($x) {
        return preg_match('/^[A-Z][-_.A-Za-z0-9]$/i', $x);
    }

    if (isset($_GET['section']) && isValidID($_GET['section'])) {
        $bodyID = $_GET['section'];
    } else if (isset($_GET['page']) && isValidID($_GET['page'])) {
        $bodyID = $_GET['page'];
    } else {
        $bodyID = 'home';
    }
?>
...
<body id="<?php echo $bodyID; ?>">

Alternatively,

<?php
    function isValidID($x) {
        return preg_match('/^[A-Z][-_.A-Za-z0-9]$/i', $x);
    }
    $bodyID='home';
    foreach (array('section', 'home') as $key) {
        if (isset($_GET[$key]) && isValidID($_GET[$key])) {
            $bodyID = $_GET[$key];
            break;
        }
    }
?>
...
<body id="<?php echo $bodyID; ?>">

In this case, I'd use the first, unrolled version. If you had to check more input keys, use the loop-based approach.

If you decide you want both page & section in the ID, you can try something like:

<?php
    function isValidID($x) {
        return preg_match('/^[A-Z][-_.A-Za-z0-9]$/i', $x);
    }

    if (isset($_GET['page']) && isValidID($_GET['page'])) {
        $bodyID = $_GET['page'];
    } else {
        $bodyID = 'home';
    }
    if (isset($_GET['section']) && isValidID($_GET['section'])) {
        $bodyID .= '_' . $_GET['section'];
    }
?>
...
<body id="<?php echo $bodyID; ?>">

outis 2010-02-13 05:24:51

Answer 3

A:

I am not entirely sure I understand your question, but where you're doing:

$_GET['page']; echo $page;

What do you think is happening? You're echoing a variable that has no definition. If you want to echo the value passed in the url, just do:

echo $_GET['page'];

GET doesnt mean your getting the varible, its the method by which the variable was passed to he page. The possible methods are get (in the url) or post (not).

Erik 2010-02-13 05:25:39

Answer 4

A:

Wouldn't that be an if to find out it if the section was defined? i.e.

if(isset($_GET['section'])){
     //create div
} elseif(isset($_GET['page']){
    //create fallback div
}

Cryophallion 2010-02-13 05:27:45

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If-statement: how to pull 2nd GET variable

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