Why are more than two commands not processed sequentially?

Question

Task Schedulers

crontab does not process php file execution sequences. Between them is a command to delete a file, it is the second one, followed by a php script that is not being processed. The feeling that crontab works with just two commands.
PS: The sequence is separated by &&.

Answer 1

cron executes binaries and knows nothing about `&&`.
It is possible to run a command shell which already pass a mini-script with `&&`, for example:/bin/sh -c "command1 && command2"

Answer 2

The answer is found: the matter is in absolute paths. It was necessary to specify the full path from php and it all worked. Thanks to all!!!