Okt 01

PHP’s missing function: is_urlencoded

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Sometimes, you might need to check whether a string has already been urlencoded with PHP or not. Sadly, PHP doesn't offer such a function but because I recently needed it, I tried this one:

/**
 * Returns true if given string is url encoded
 *
 * @param string $string
 * @return boolean
 */
function is_urlencoded($string) {
	return $string === urlencode(urldecode($string));
}

This works fine for me (as far as I have tested), so maybe it is a litte help for anyone with the same problem

3 Antworten zu “PHP’s missing function: is_urlencoded”

  1. justme sagt: 27. März 2010 um 20:10

    It does not work:
    Check out this example:
    $string = ‘/wiki/%C3%89lections_l%C3%A9gislatives_irakiennes_de_2010′;
    # I know for sure it is urlencoded
    echo is_urlencoded($string) ? urldecode($string) : $string;

    Though, the idea is great, I think it should be:
    function is_urlencoded($string) {
    return $string !== urlencode(urldecode($string));
    }

  2. justme sagt: 27. März 2010 um 21:23

    Actually it is easier than that:

    function is_urlencoded($string) {
    return urldecode($string) != $string;
    }
    should be ok.

  3. Grundi sagt: 27. März 2010 um 22:48

    Hi justme.
    At first your given string is NOT urlencoded, because it had to start with %2F otherwise, because “/” is “%2F” after urlencode(“/”)!
    Second, you can easily check which function works on which string and which does not. Here a simple phpunit testcase:

    < ?php
    require_once 'PHPUnit/Framework.php';

    class TestIsUrlEncoded extends PHPUnit_Framework_TestCase {

    public function testMyFunction() {
    $this->assertTrue(is_urlencoded(‘%2Fwiki%2F%C3%89lections_l%C3%A9gislatives_irakiennes_de_2010′));
    $this->assertFalse(is_urlencoded(‘/wiki/%C3%89lections_l%C3%A9gislatives_irakiennes_de_2010′));
    }

    public function testShortFunction() {
    $this->assertTrue(is_urlencoded_short(‘%2Fwiki%2F%C3%89lections_l%C3%A9gislatives_irakiennes_de_2010′));
    $this->assertFalse(is_urlencoded_short(‘/wiki/%C3%89lections_l%C3%A9gislatives_irakiennes_de_2010′));
    }

    public function testWrongFunction() {
    $this->assertTrue(is_urlencoded_wrong(‘%2Fwiki%2F%C3%89lections_l%C3%A9gislatives_irakiennes_de_2010′));
    $this->assertFalse(is_urlencoded_wrong(‘/wiki/%C3%89lections_l%C3%A9gislatives_irakiennes_de_2010′));
    }

    }

    function is_urlencoded($string) {
    return $string === urlencode(urldecode($string));
    }

    function is_urlencoded_short($string) {
    return urldecode($string) != $string;
    }

    function is_urlencoded_wrong($string) {
    return $string !== urlencode(urldecode($string));
    }
    ?>

    You can easily adjust the testcase to your needs. Hope that helps.

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