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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