CaseInsensitiveDictionary::offsetSet( $offset,  $value )

Source

public function offsetSet($offset, $value) {
	if ($offset === null) {
		throw new Exception('Object is a dictionary, not a list', 'invalidset');
	}

	if (is_string($offset)) {
		$offset = strtolower($offset);
	}

	$this->data[$offset] = $value;
}

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