Clarification on set, unset, empty...

Can someone clarify on the functions like unset() set() empty() is_empty().

Basically I am needing to know which functions to use to do the following on CONSTANTS, variables and arrays:

1. Check to see if it is empty.

2. Empty(unset) the data type.

This is all covered in the manual, I just don't see how were going to give you any clearer explination.

I looked in the "manual" and didn't understand how to utilize the functions with the provided explanation. Maybe I wasn't looking at the correct function and am at a loss for further ideas because I have never used the needed functions. Maybe I am struck by a case of functional fixedness. Whatever the case may be, I spent the time looking in the "manual" because I wanted to avoid useless posts advising on how I should read to find it rather than post something stupid. I am sure it would have taken 10 seconds less to type:

Check for set = function()

Unset = function()

strlen() = 45

rather than:

This is all covered in the manual, I just don't see how were going to give you any clearer explination.

strlen() = 103

By the way unkwntech, your link is pointless.

http://www.php.net/functionName

I hate to be rude thorpe. But this is more than one instance where I have looked, couldn't find the answer, and received the same useless response from a moderator. The answer to 95% of everything can be found on the web. If people should always check the web, then what is the use of community forums?

isset() checks if a variable exists.

empty() checks to see if an existing variable contains a value.

The other two functions you mention do not exist.

Thank you very much I think that solves my entire predicament.

unset()

And yes is_empty is totally non-existent. I don't know what I was thinking.