Returns a string containing a string representation of all the array elements in the same order, with the glue string between each element.
注: implode() can, for historical reasons, accept its parameters in either order. For consistency with explode() , however, it may be less confusing to use the documented order of arguments.
注: As of PHP 4.3.0, the glue parameter of implode() is optional and defaults to the empty string(''). This is not the preferred usage of implode() . We recommend to always use two parameters for compatibility with older versions.
注: 本函数可安全用于二进制对象。