Shell sourced function not available to executed script

[Clint Priest <cpriest@zsh-users.rxv.me>]

I could be wrong, but I swear that a function declared in my shell 
environment was available to another script executed from the CLI.

In my case, I have a function:

pv() {
     echo "\$$1='${(P)1}'";
}

Which is `source`ed into my environment.  I could type pv PATH and it 
would echo:
$PATH='...'

However when I run another script with executability set, shebang is 
#!/bin/zsh it tells me pv is not available.

Any ideas?

-- 

-Clint