The unlink() function is an inbuilt function in PHP which is used to delete files. It is similar to UNIX unlink() function. The $filename is sent as a parameter that needs to be deleted and the function returns True on success and false on failure.
unlink( $filename, $context )
Parameters: This function accepts two parameters as mentioned above and described below:
- $filename: It is a mandatory parameter which specifies the filename of the file which has to be deleted.
- $context: It is an optional parameter which specifies the context of the file handle which can be used to modify the nature of the stream.
Return Value: It returns True on success and False on failure.
Errors And Exception:
- The unlink() function generates an E_WARNING level error on failure.
- The web server user must have write permissions to the directory for using the unlink() function.
- The unlink() function returns Boolean False but many times it happens that it returns a non-Boolean value which evaluates to False.
Below programs illustrate the unlink() function in PHP:
Suppose there is a file named as “gfg.txt”
gfg.txt has been deleted
Warning: unlink() expects parameter 1 to be a valid path, resource given in C:\xampp\htdocs\server.php on line 12 Resource id #3 cannot be deleted due to an error