return join('', $result);
} else {
$matchIndex = strpos($str, $search);
if ($matchIndex === false) {
return $str;
}
$before = substr($str, 0, $matchIndex);
$after = substr($str, $matchIndex + strlen($search));
//mb_strlen used to calculate multi-byte character index
$args = array($search, mb_strlen($before), $str);
return $before . to_string($replace->apply(null, $args)) . $after;
}
}
$replace = to_string($replace);
if ($isRegEx) {
$replace = RegExp::toReplacementString($replace);
return preg_replace($search, $replace, $str, $limit);
} else {
$parts = explode($search, $str);
$first = array_shift($parts);
return $first . $replace . implode($search, $parts);
}
}, 'toLowerCase' => function () {
$self = Func::getContext();
return mb_strtolower($self->value);
}, 'toLocaleLowerCase' => function () {
$self = Func::getContext();
return mb_strtolower($self->value);
}, 'toUpperCase' => function () {
$self = Func::getContext();
return mb_strtoupper($self->value);
