function UnicodeString::indexOf

Overrides AbstractString::indexOf

File

vendor/symfony/string/UnicodeString.php, line 134

Class

UnicodeString

Represents a string of Unicode grapheme clusters encoded as UTF-8.

Namespace

Symfony\Component\String

Code

public function indexOf(string|iterable|AbstractString $needle, int $offset = 0) : ?int {
    if ($needle instanceof AbstractString) {
        $needle = $needle->string;
    }
    elseif (!\is_string($needle)) {
        return parent::indexOf($needle, $offset);
    }
    $form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
    normalizer_is_normalized($needle, $form) ?: ($needle = normalizer_normalize($needle, $form));
    if ('' === $needle || false === $needle) {
        return null;
    }
    try {
        $i = $this->ignoreCase ? grapheme_stripos($this->string, $needle, $offset) : grapheme_strpos($this->string, $needle, $offset);
    } catch (\ValueError) {
        return null;
    }
    return false === $i ? null : $i;
}