Trace/src/V2/AttributeValue.php
public function setStringValue($var)
    {
        GPBUtil::checkMessage($var, \Google\Cloud\Trace\V2\TruncatableString::class);
        $this->writeOneof(1, $var);

        return $this;
    }
public function setStringValue($var)
    {
        GPBUtil::checkMessage($var, \Google\Cloud\Trace\V2\TruncatableString::class);
        $this->writeOneof(1, $var);

        return $this;
    }
public function setStringValue ( $ var ) { GPBUtil :: checkMessage ( $ var , \ Google \ Cloud \ Trace \ V2 \ TruncatableString :: class ) ; $ this -> writeOneof ( 1 , $ var ) ; return $ this ; }
A string up to 256 bytes long.

Generated from protobuf field <code>.google.devtools.cloudtrace.v2.TruncatableString string_value = 1;</code>
@param \Google\Cloud\Trace\V2\TruncatableString $var
@return $this
A string up to 256 bytes long .