PHP通配符问题

1,
$str = 'Good morning @@name@@ .';
$str = str_replace("@@name@@", $name, $str);

2,
$str = 'What is @@a@@ , @@b@@';
$paramsData = [
	'a' => '1',
	'b' => '2',
];
$resultStr = preg_replace_callback(
            "|@@([^@]+)@@|",
            function($matches) use ($paramsData) {
                if (!isset($paramsData[$matches[1]])) {
                    //return $matches[0];
                    return '';
                }
                return $paramsData[$matches[1]];
            },
            $str);

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