Definition and Usage
定义和用法

The join() function returns a string from the elements of an array.
join()函数的作用是：以一个字符串的形式返回数组元素。

The join() function is an alias of the implode() function.
join()函数和implode()函数的功能类似。

Syntax
语法

join(separator,array)

Tips and Notes
注意点

Note: The join() function accept its parameters in either order. However, for consistency with explode(), you should use the documented order of arguments.
注意：join()函数中的参数可以以任何顺序排列。然而，如果你将它和explode()函数一起使用，你需要遵循自变量的文档顺序。

Note: The separator parameter of join() is optional. However, it is recommended to always use two parameters for backwards compatibility.
注意：implode()函数的分隔符[separator]参数是可选的。我们推荐使用两个参数以保证其向后兼容。

Example
案例

<?php
$arr = array('Hello','World!','Beautiful','Day!');
echo join(" ",$arr);
?> 

The output of the code above will be:
上述代码将输出下面的结果：

Hello World! Beautiful Day!

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