File existence and info checks in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What PHP function checks if a file exists?

The file_exists() function checks if a file or directory exists at the specified path.

beginner

How do you check if a path is a directory in PHP?

Use the is_dir() function to check if the given path is a directory.

beginner

What function returns the size of a file in bytes?

The filesize() function returns the size of a file in bytes.

beginner

How can you check if a file is readable in PHP?

Use the is_readable() function to check if the file can be read.

beginner

What does is_file() check in PHP?

It checks if the given path exists and is a regular file (not a directory).

Which PHP function checks if a file or directory exists?

A file_exists()

B is_file()

C is_dir()

D filesize()

file_exists() returns true if the file or directory exists.

What does is_dir() return if the path is a file?

A false

B true

C null

D throws error

is_dir() returns false if the path is not a directory.

Which function gives the size of a file in bytes?

A file_exists()

B filesize()

C is_readable()

D is_file()

filesize() returns the size of the file in bytes.

How to check if a file can be read by PHP?

A file_exists()

B is_writable()

C is_file()

D is_readable()

is_readable() returns true if the file is readable.

What does is_file() check?

A If file is readable

B If path is a directory

C If path is a regular file

D If file exists

is_file() returns true only if the path is a regular file.

Explain how to check if a file exists and is readable in PHP.

Think about first confirming the file is there, then if you can read it.

Describe the difference between is_file() and is_dir().

One checks files, the other checks folders.