Description:
------------
Switches --rf, --rc, --re and --rz always return a zero exit code whether the object exists or not. However, this is in contrast to --ri, which returns zero only if the extension exists and one if it does not.

I was not going to raise a bug until I noticed this is inconsistent, however I believe all lookups should return non-zero if the object doesn't exist since this makes them much easier to use in scripts to test if functionality is available.

Test script:
---------------
$ php --re foo; echo $?
Exception: Extension foo does not exist
0

$ php --re core; echo $?
<redacted>
0

$ php --ri foo; echo $?
Extension 'foo' not present.
1

$ php --ri core; echo $?
<redacted>
0



Expected result:
----------------
$ php --re foo; echo $?
Exception: Extension foo does not exist
1

$ php --re core; echo $?
<redacted>
0

$ php --ri foo; echo $?
Extension 'foo' not present.
1

$ php --ri core; echo $?
<redacted>
0