Use a one-element array to add a single user name.
可以使用一个元素的数组来添加单个用户名。
The preg_replace function can operate on a single string or an array of strings.
preg_replace函数可以对单个字符串或字符串数组进行操作。
The outer array contains a single key/value pair, with the key Now.
最外层数组只包含一个键/值对，键名是 Now。
If one of the arguments is an array, it is added as a single element.
如果参数之一是一个数组，则该数组将作为单个元素添加到数组中。
If one of the arguments is an array, it is added as a single element.
如果参数之一是一个数组，则该数组将作为单个元素添加到数组中。
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