mb_strstr - PHP code example

How to Use the PHP Function mb_String()

mb_strstr() finds the first occurrence of a string in another string. If it finds the string, it returns that string and stops searching.

If mb_strstr() doesn't find the string, it returns FALSE. The function is binary-safe, and case-insensitive. It is an alternative to the strstr() function.

This function accepts three parameters: $string, $start, and $length. The start and length parameters determine which portion of the string to grab. If a negative offset is specified, the returned string will start from that point onwards.

In order to use this function, you must have the mbstring PHP extension enabled. This extension makes PHP multibyte safe. If you do not have it enabled, you will experience errors when trying to run this function. To enable it, navigate to the Exhaustive Options List in EasyApache and check the Mbstring box. Once you have done this, click Save and Build.

The mb_strstr() function is a variant of the substr() function that is used to select a specific part of a string. It has many uses in programming, and it allows you to take control over the offset and the length of the string that is pulled out.

mb_strstr example

class XmlFileWriter extends AbstractFileWriter
{
    public function append(Config $config, array $data, int $index): void
    {
        if ($index === 0) {
            fwrite($this->buffer, "<?xml version=\"1.0\"?><root>\n");
        }

        $item = new \SimpleXMLElement('<item/>');
        $this->addDataToNode($item, $data);
        /** @var string $xml */
        $xml = mb_strstr($item->asXML(), '<item>');
        fwrite($this->buffer, $xml);
    }

    public function finish(Config $config, string $targetPath): void
    {
        fwrite($this->buffer, "</root>\n");
        parent::finish($config, $targetPath);
    }

    private function addDataToNode(\SimpleXMLElement $node, array $data): void
    {

if (!function_exists('mb_strrichr')) {
    function mb_strrichr(?string $haystack, ?string $needle, ?bool $before_needle = false, ?string $encoding = null): string|false { return p\Mbstring::mb_strrichr((string) $haystack, (string) $needle, (bool) $before_needle, $encoding); }
}
if (!function_exists('mb_strripos')) {
    function mb_strripos(?string $haystack, ?string $needle, ?int $offset = 0, ?string $encoding = null): int|false { return p\Mbstring::mb_strripos((string) $haystack, (string) $needle, (int) $offset, $encoding); }
}
if (!function_exists('mb_strrpos')) {
    function mb_strrpos(?string $haystack, ?string $needle, ?int $offset = 0, ?string $encoding = null): int|false { return p\Mbstring::mb_strrpos((string) $haystack, (string) $needle, (int) $offset, $encoding); }
}
if (!function_exists('mb_strstr')) {
    function mb_strstr(?string $haystack, ?string $needle, ?bool $before_needle = false, ?string $encoding = null): string|false { return p\Mbstring::mb_strstr((string) $haystack, (string) $needle, (bool) $before_needle, $encoding); }
}
if (!function_exists('mb_get_info')) {
    function mb_get_info(?string $type = 'all'): array|string|int|false { return p\Mbstring::mb_get_info((string) $type); }
}
if (!function_exists('mb_http_output')) {
    function mb_http_output(?string $encoding = null): string|bool { return p\Mbstring::mb_http_output($encoding); }
}
if (!function_exists('mb_strwidth')) {
    function mb_strwidth(?string $string, ?string $encoding = null): int { return p\Mbstring::mb_strwidth((string) $string, $encoding); }
}
if (!function_exists('mb_substr_count')) {

        return self::grapheme_position($s, $needle, $offset, 3);
    }

    public static function grapheme_stristr($s, $needle, $beforeNeedle = false)
    {
        return mb_stristr($s, $needle, $beforeNeedle, 'UTF-8');
    }

    public static function grapheme_strstr($s, $needle, $beforeNeedle = false)
    {
        return mb_strstr($s, $needle, $beforeNeedle, 'UTF-8');
    }

    private static function grapheme_position($s, $needle, $offset, $mode)
    {
        $needle = (string) $needle;
        if (80000 > \PHP_VERSION_ID && !preg_match('/./us', $needle)) {
            return false;
        }
        $s = (string) $s;
        if (!preg_match('/./us', $s)) {
            return false;
        }

if (!function_exists('mb_strrichr')) {
    function mb_strrichr($haystack, $needle, $before_needle = false, $encoding = null) { return p\Mbstring::mb_strrichr($haystack, $needle, $before_needle, $encoding); }
}
if (!function_exists('mb_strripos')) {
    function mb_strripos($haystack, $needle, $offset = 0, $encoding = null) { return p\Mbstring::mb_strripos($haystack, $needle, $offset, $encoding); }
}
if (!function_exists('mb_strrpos')) {
    function mb_strrpos($haystack, $needle, $offset = 0, $encoding = null) { return p\Mbstring::mb_strrpos($haystack, $needle, $offset, $encoding); }
}
if (!function_exists('mb_strstr')) {
    function mb_strstr($haystack, $needle, $before_needle = false, $encoding = null) { return p\Mbstring::mb_strstr($haystack, $needle, $before_needle, $encoding); }
}
if (!function_exists('mb_get_info')) {
    function mb_get_info($type = 'all') { return p\Mbstring::mb_get_info($type); }
}
if (!function_exists('mb_http_output')) {
    function mb_http_output($encoding = null) { return p\Mbstring::mb_http_output($encoding); }
}
if (!function_exists('mb_strwidth')) {
    function mb_strwidth($string, $encoding = null) { return p\Mbstring::mb_strwidth($string, $encoding); }
}
if (!function_exists('mb_substr_count')) {