mb_convert_variables - PHP code example

Using PHP Functions to Simplify Your Code

PHP functions are a vital programming technique that allow you to group a set of statements together and execute them as a single unit. They promote code reusability and improve readability by breaking complex tasks down into smaller, more manageable chunks that are easier to understand and follow.

Functions are defined using the function keyword and enclosed within curly braces. They take input values through arguments, which are placed after the function name in parentheses. Functions return a value or result from the set of instructions they execute. They can be used throughout a script to perform specific tasks, such as converting text to binary or calculating the distance between two points on a map.

There are many built-in PHP functions that ship with the core and additional extensions compiled with it, as well as user-defined functions created by developers. You can use these to help simplify your code and speed up your application development time.

When creating your own function, it is important to name it with a descriptive title and include clear parameters and returns in the definition. This will make it easier for other developers to understand the purpose of your function and how to use it.

In addition to having a function definition, you must also have a declaration for each variable that is referenced in the function. This will ensure that the variable is of the proper data type for the function to operate on. Without a declaration, you will receive a “Fatal Error: Unknown type” error when trying to use the function.

mb_convert_variables example

$line .= $char;
                    continue;
                }
                // if not, push current line to array and make new line                 $lines[] = str_pad($line, $width);
                $line = $char;
            }
        }

        $lines[] = \count($lines) ? str_pad($line, $width) : $line;

        mb_convert_variables($encoding, 'utf8', $lines);

        return $lines;
    }

    /** * Returns all namespaces of the command name. * * @return string[] */
    private function extractAllNamespaces(string $name): array
    {

if (!function_exists('mb_substr_count')) {
    function mb_substr_count($haystack, $needle, $encoding = null) { return p\Mbstring::mb_substr_count($haystack, $needle, $encoding); }
}
if (!function_exists('mb_output_handler')) {
    function mb_output_handler($string, $status) { return p\Mbstring::mb_output_handler($string, $status); }
}
if (!function_exists('mb_http_input')) {
    function mb_http_input($type = null) { return p\Mbstring::mb_http_input($type); }
}

if (!function_exists('mb_convert_variables')) {
    function mb_convert_variables($to_encoding, $from_encoding, &...$vars) { return p\Mbstring::mb_convert_variables($to_encoding, $from_encoding, ...$vars); }
}

if (!function_exists('mb_ord')) {
    function mb_ord($string, $encoding = null) { return p\Mbstring::mb_ord($string, $encoding); }
}
if (!function_exists('mb_chr')) {
    function mb_chr($codepoint, $encoding = null) { return p\Mbstring::mb_chr($codepoint, $encoding); }
}
if (!function_exists('mb_scrub')) {
    function mb_scrub($string, $encoding = null) { $encoding = null === $encoding ? mb_internal_encoding() : $encoding; return mb_convert_encoding($string, $encoding, $encoding); }
}

if (!function_exists('mb_substr_count')) {
    function mb_substr_count(?string $haystack, ?string $needle, ?string $encoding = null): int { return p\Mbstring::mb_substr_count((string) $haystack, (string) $needle, $encoding); }
}
if (!function_exists('mb_output_handler')) {
    function mb_output_handler(?string $string, ?int $status): string { return p\Mbstring::mb_output_handler((string) $string, (int) $status); }
}
if (!function_exists('mb_http_input')) {
    function mb_http_input(?string $type = null): array|string|false { return p\Mbstring::mb_http_input($type); }
}

if (!function_exists('mb_convert_variables')) {
    function mb_convert_variables(?string $to_encoding, array|string|null $from_encoding, mixed &$var, mixed &...$vars): string|false { return p\Mbstring::mb_convert_variables((string) $to_encoding, $from_encoding ?? '', $var, ...$vars); }
}

if (!function_exists('mb_ord')) {
    function mb_ord(?string $string, ?string $encoding = null): int|false { return p\Mbstring::mb_ord((string) $string, $encoding); }
}
if (!function_exists('mb_chr')) {
    function mb_chr(?int $codepoint, ?string $encoding = null): string|false { return p\Mbstring::mb_chr((int) $codepoint, $encoding); }
}
if (!function_exists('mb_scrub')) {
    function mb_scrub(?string $string, ?string $encoding = null): string { $encoding ??= mb_internal_encoding(); return mb_convert_encoding((string) $string, $encoding, $encoding); }
}