file handling

Question 1

fopen(“testfile.txt”, ‘w’)

Answer 1

Opens a file called testfile, the second parameter ‘w’ tells the function to open the file for writing. The function creates the file if it doesn’t already exist. Be careful when playing around with these functions: if the file already exists, the w mode parameter causes the open call to delete the old contents (even if you don’t write anything new)

Question 2

fread

Answer 2

Reads from file
fread($fh, 3); // Requests the first 3 characters of file assigned to $fh

The read function is commonly used with binary data. But if you use it on text data that spans more than one line, remember to count newline characters.

Question 3

fwrite

Answer 3

Writes to file

Question 4

fclose

Answer 4

Closes file

Question 5

copy(‘testfile.txt’, ‘testfile2.txt’)

Answer 5

Copies testfile.txt to testfile2.txt

Question 6

moving a file

Answer 6

To move a file, rename it with the rename function:

rename(‘testfile2.txt’, ‘testfile2.new’);

Question 7

deleting a file

Answer 7

To delete a file, use the unlink function:

unlink(‘testfile2.new’);

Question 8

file_exists

Answer 8

Returns TRUE if the file exists or FALSE if it doesn’t:

file_exists(‘testfile2.new’);

Question 9

fseek

Answer 9

Moves the file pointer