18. How do you check if a file is readable in PHP?

What is the purpose of the 'r' mode when opening a file in PHP?

A). Read data from a file

B). Write data to a file

C). Append data to a file

D). Truncate a file

Which function is used to open a file in PHP?

A). fopen()

B). readfile()

C). file_get_contents()

D). file_put_contents()

Which function is used to check if a file exists in PHP?

A). file_exists()

B). is_file()

C). file_check()

D). check_file()

What does the 'a' mode do when opening a file in PHP?

A). Appends data to the end of the file

B). Reads data from the file

C). Truncates the file to zero length

D). Creates a new file if it doesn't exist

What is the purpose of the 'b' mode when opening a file in PHP?

A). Binary mode for reading and writing data

B). Read mode for large files

C). Backup mode for file operations

D). Buffer mode for file handling

Which mode should be used to open a file for both reading and writing in PHP?

A). r+

B). w+

C). a+

D). rb+

Which function is used to write data to a file in PHP?

A). fwrite()

B). fput()

C). file_write()

D). put_file()

What happens if you try to open a non-existent file in 'r' mode?

A). fopen() returns false

B). A new file is created

C). The script throws an error

D). The file is opened in read mode

Which function is used to delete a file in PHP?

A). unlink()

B). delete_file()

C). remove_file()

D). erase()

Which function is used to write data to a file if the file doesn't exist in PHP?

A). file_put_contents()

B). fwrite()

C). fput()

D). put_file()