How to set the relevant configuration of the php path

Methods to set the configuration related to the PHP path path: 1. [get_include_path()] to obtain the current environment variable; 2. [dirname (_FILE_)] The path of the current script file; 3. [dirname(dirname(_FILE_ ))】The directory of the previous level.

Methods to set php path path related configuration:

1. get_include_path() to obtain the current environment variable, That is, the include_path set in php.ini;

set_include_path() is the path to set the include. After this setting, you can use include("conn.php") directly in other pages;

2. __FILE__: global variable, the full path of the file;

dirname (_FILE_): the path of the current script file;

dirname(dirname(_FILE_)): the upper-level directory.

PATH_SEPARATOR: path separator windows(;),Linux(:);

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