PHP glob Function: File Pattern Matching

The glob() function is used to search for all files or directories that meet a specified rule in a specified directory, and return an array containing the names of these files or directories.

Here is how it is used:

array glob ( string $pattern [, int $flags = 0 ] )

The $pattern parameter specifies the pattern of the file or directory name to search for, and can include wildcards such as * or ?. The $flags parameter specifies the flags for the search, such as GLOB_BRACE, GLOB_ONLYDIR, and so on.

For example, the following code will search for all files ending with the .txt extension in the specified directory:

$files = glob('/path/to/directory/*.txt');

The glob() function has high flexibility as it supports relative paths, absolute paths, wildcards, directories, recursive searching, and more.