API16:JString/compliant

Description

Tests whether a string complies as UTF-8. This will be much faster than utf8_is_valid but will pass five and six octet UTF-8 sequences, which are not supported by Unicode and so cannot be displayed correctly in a browser. In other words it is not as strict as utf8_is_valid but it's faster. If you use is to validate user input, you place yourself at the risk that attackers will be able to inject 5 and 6 byte sequences (which may or may not be a significant risk, depending on what you are are doing) valid http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php#54805

Syntax

static compliant($str)

Parameter Name	Default Value	Description
$str		UTF-8 string to check

Returns

boolean TRUE if string is valid UTF-8

Defined in

libraries/joomla/utilities/string.php

Importing

jimport( 'joomla.utilities.string' );

Source Body

public static function compliant($str)
{
        if (strlen($str) == 0) {
                return TRUE;
        }
        // If even just the first character can be matched, when the /u
        // modifier is used, then it's valid UTF-8. If the UTF-8 is somehow
        // invalid, nothing at all will match, even if the string contains
        // some valid sequences
        return (preg_match('/^.{1}/us',$str,$ar) == 1);
}