Difference between tempnam and tmpfile created by php

The tempnam () function creates a temporary file with a unique file name. if the file name is successfully created, the function returns a new temporary file name. if the file name fails, false is returned.

The tempnam () function creates a temporary file with a unique file name. if the file name is successfully created, the function returns a new temporary file name. if the file name fails, false is returned.

Syntax: tempnam (dir, prefix)

1. Function dir_wriable ($ dir) // customize function extension to create a temporary file
2. {
3. $ Test = tempnam ("$ dir", "test_file"); // create a temporary file
4. If ($ fp = @ fopen ($ test, "w") // if the file is successfully opened
5. {
6. @ Fclose ($ fp); // close the file
7. @ Unlink ($ test); // delete an object
8. $ Wriable = "ture"; // The return value is true.
9. }
10. Else
11. {
12. $ Wriable = false or die ("cannot open $ test! "); // The returned value is false.
13. }
14. Return $ wriable; // returns a boolean value.
15. }
16. If (dir_wriable (str_replace ('/', '/', dirname (_ file _) // call a UDF
17. {
18. $ Dir_wriable = 'File created successfully ';
19. }
20. Else
21. {
22. $ Dir_wriable = 'File creation failed ';
23. }

If php cannot create a file in the specified dir parameter, it is returned to the default value of the system.

Note: the behavior of this function has changed in version 4.0.3. A temporary file will also be created to avoid competition, that is, there may be a file with the same name in the file system between the string generated as the file name and the script to actually create the file. Note: If the file is no longer needed, the file will not be deleted automatically.

The tmpfile () function creates a temporary file with a unique file name in read/write (w +) mode. after the file is closed, it is automatically deleted using fclose (), or after the script is completed.

1. $ Temp = tmpfile ();
2. Fwrite ($ temp, "testing, testing .");
3. // Returns the start of the file.
4. Rewind ($ temp );
5. // Read 1 k from the file
6. Echo fread ($ temp, 1024 );
7. // Delete an object
8. Fclose ($ temp );