Directory operations in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What PHP function is used to open a directory for reading?

The opendir() function is used to open a directory and prepare it for reading its contents.

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How do you read entries from an opened directory in PHP?

Use the readdir() function to read the next entry (file or directory name) from the directory handle.

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What is the purpose of the closedir() function in PHP?

It closes an open directory handle, freeing up system resources.

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How can you check if a directory exists in PHP?

Use the is_dir() function, which returns true if the path is a directory, otherwise false.

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Which PHP function creates a new directory?

The mkdir() function creates a new directory with specified permissions.

Which function opens a directory for reading in PHP?

A fopen()

B readfile()

C opendir()

D dir_open()

opendir() is the correct function to open a directory handle.

What does readdir() return when it reaches the end of a directory?

A false

B null

C empty string

D 0

readdir() returns false when no more entries are available.

Which function checks if a path is a directory?

A file_exists()

B is_file()

C dir_exists()

D is_dir()

is_dir() returns true if the path is a directory.

How do you close a directory handle in PHP?

A close()

B closedir()

C dir_close()

D enddir()

closedir() closes an open directory handle.

Which function creates a new directory?

A mkdir()

B newdir()

C createdir()

D dir_create()

mkdir() creates a new directory.

Explain the steps to read all files and directories inside a directory in PHP.

Think about opening, reading each entry, and then closing.

How can you safely create a directory only if it does not already exist in PHP?

Check first, then create.