function CodePointString::prepend

Overrides AbstractString::prepend

File

vendor/symfony/string/CodePointString.php, line 156

Class

CodePointString

Represents a string of Unicode code points encoded as UTF-8.

Namespace

Symfony\Component\String

Code

public function prepend(string ...$prefix) : static {
    $str = clone $this;
    $str->string = (1 >= \count($prefix) ? $prefix[0] ?? '' : implode('', $prefix)) . $this->string;
    if (!preg_match('//u', $str->string)) {
        throw new InvalidArgumentException('Invalid UTF-8 string.');
    }
    return $str;
}