Path problems in php and introduction to the use of set_include_path_PHP tutorial

first:

Path commonly used in php

Current file path: D:phpwebphp_exampleinclude_path.php

second:

set_include_path in php

In php, when including a file, when the include path is neither relative nor absolute (such as: include( "example.php")), will first search the directory set by include_path, and then search in the current directory. This is why many materials mention that include("./example.php") is better than include("example.php" ) reasons for high efficiency.

Method:

1.ini_set("include_path", "/usr/lib/pear"); //All versions
2.set_include_path("/usr/lib/pear" "); //version>=4.3.0
You can use the following method to add a directory to the original directory