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Re: empty - not empty() [message #176292 is a reply to message #176291]

Mon, 19 December 2011 17:48

J.O. Aho
Messages: 194
Registered: September 2010

Karma:

Senior Member

bill wrote:
> searching the manual gives lots of hits, none of which appear relevant (at
> least by the title).
>
> I had the following code in a scheduling class:
>
> if ($ptNum == "empty") {
> $ptNum = 0;
> $status= "e";
> }
>
> I pass the string "empty" to the function as a patient number if we are
> creating an empty appointment slot.
>
> now, this fails because with a patient number of 0 the if returns true.
>
> I am aware of the function empty() that would work like that, but do not
> understand why the compare fails with the constant, "empty."

I assume you are comparing 0 and not the string "0", this makes you are
comparing integer with string, there ain't any type conversion done.
The zero is always equal to a string, there is a slightly more information at

http://php.net/manual/en/language.operators.comparison.php

> I fixed the function by making it a strict compare, but would like to know why
> the regular compare is true with the numeric value of zero.

I would say it's not the right way to compare, use strcmp, is_numeric and so
on, to make a proper compare instead of using the comparison operator.

--

//Aho

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[Message index]

		empty - not empty() By: bill on Mon, 19 December 2011 15:09
		Re: empty - not empty() By: J.O. Aho on Mon, 19 December 2011 17:48
		Re: empty - not empty() By: Chuck Anderson on Tue, 20 December 2011 01:14
		Re: empty - not empty() By: bill on Tue, 20 December 2011 13:14
		Re: empty - not empty() By: M. Strobel on Tue, 20 December 2011 16:40
		Re: empty - not empty() By: bill on Tue, 20 December 2011 23:44

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