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seems_utf8()

Description

Looks for particular patterns to attempt to determine if the provided string is in UTF8 format

Parameters

ColumnTypeDefaultDescription
$str string

Return

boolean True if it's possibly UTF8

Location

include/language_functions.php lines 519 to 549

Definition

 
function seems_utf8($str)
{
    $length = strlen($str);

    for ($i = 0; $i < $length; $i++) {
        $c = ord($str[$i]);

        if ($c < 0x80) {
            $n = 0; # 0bbbbbbb
        } elseif (($c & 0xE0) == 0xC0) {
            $n = 1; # 110bbbbb
        } elseif (($c & 0xF0) == 0xE0) {
            $n = 2; # 1110bbbb
        } elseif (($c & 0xF8) == 0xF0) {
            $n = 3; # 11110bbb
        } elseif (($c & 0xFC) == 0xF8) {
            $n = 4; # 111110bb
        } elseif (($c & 0xFE) == 0xFC) {
            $n = 5; # 1111110b
        } else {
            return false; # Does not match any model
        }

        for ($j = 0; $j < $n; $j++) { # n bytes matching 10bbbbbb follow ?
            if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80)) {
                return false;
            }
        }
    }
    return true;
}

This article was last updated 4th December 2024 08:35 Europe/London time based on the source file dated 27th November 2024 15:30 Europe/London time.