Why doesn't the exec('php test.php > test.txt'); construct work?

Question

PHP

The file is created, but the result of any command is not written to it. For example, the result of exec('php -i > test.txt'); is again an empty file.
PHP does not output exactly the result, exec('echo "test" > test.txt'); for example writes

Answer 1

Trouble with the path? try specifying the full path to the interpreter. By the way - maybe the rights are not enough.