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Re: A little tip [message #177468 is a reply to message #177467]

Sat, 31 March 2012 15:27

Shelly[1]
Messages: 16
Registered: March 2012

Karma:

Junior Member

On 3/31/2012 10:05 AM, Jerry Stuckle wrote:
> On 3/30/2012 4:55 PM, Shelly wrote:
>> On 3/30/2012 4:30 PM, Thomas Mlynarczyk wrote:
>>> Shelly schrieb:
>>>
>>>> $val = TRUE;
>>>
>>>> $val &= TRUE;
>>>>
>>>> which is identical to
>>>>
>>>> $val = $val && TRUE;
>>>
>>> No. &= is a bitwise operator while && means the logical AND operator. So
>>> when you do $val &= TRUE, PHP is trying to do TRUE & TRUE, but since
>>> bitwise operators only work with integers, TRUE is first coerced into
>>> the integer 1. So the operation ends up as 1 & 1 yielding the integer 1.
>>> Thus, $val = 1. The === operator checks the type of the operands which
>>> are int and bool and thus not the same, while == tries to convert the
>>> operands into something "comparable" and since they are both "truish"
>>> the result is TRUE here.
>>>
>>> Greetings,
>>> Thomas
>>>
>>
>> Thank you. That makes a lot of sense. So, what I have to do if I want to
>> use === is to use the expanded form
>>
>> $val = $val && TRUE;
>>
>> Right?
>>
>>
>
> I should also add that you need to be careful and use the correct
> operator. For instance, 2 & TRUE is false, while 2 && TRUE is true.
>

Thanks. All my validation routines return either TRUE or FALSe. I have
a flag that repetitively goes something like this after initializing
$theFlag to TRUE:

$theFlag = $theFlag && validation_routine_call(arguments);

for each of the many validation routines.

At the end I do something if $theFlag === TRUE, and don't if not.

What I had been doing, incorrectly, (which led me to start this thread) was:

$theFlag &= validation_routine_call(arguments);

--
Shelly

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[Message index]

		A little tip By: Shelly[1] on Fri, 30 March 2012 17:02
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 17:20
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 18:18
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 20:19
		Re: A little tip By: Thomas Mlynarczyk on Fri, 30 March 2012 20:30
		Re: A little tip By: Doug Miller on Fri, 30 March 2012 20:55
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 20:55
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 21:07
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 14:05
		Re: A little tip By: Shelly[1] on Sat, 31 March 2012 15:27
		Re: A little tip By: Thomas 'PointedEars' on Tue, 03 April 2012 13:52
		Re: A little tip By: Shelly[1] on Tue, 03 April 2012 14:20
		Re: A little tip By: Doug Miller on Fri, 30 March 2012 19:36
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 20:21
		Re: A little tip By: Doug Miller on Fri, 30 March 2012 20:52
		Re: A little tip By: Jerry Stuckle on Fri, 30 March 2012 21:08
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 21:22
		Re: A little tip By: Mr. B-o-B on Fri, 30 March 2012 23:00
		Re: A little tip By: Scott Johnson on Sat, 31 March 2012 03:33
		Re: A little tip By: Shelly[1] on Fri, 30 March 2012 21:20
		Re: A little tip By: Thomas 'PointedEars' on Tue, 03 April 2012 13:56
		Re: A little tip By: Shelly[1] on Tue, 03 April 2012 14:20
		Re: A little tip By: Michael Fesser on Sat, 31 March 2012 03:04
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 03:31
		Re: A little tip By: Scott Johnson on Sat, 31 March 2012 03:35
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 03:53
		Re: A little tip By: Doug Miller on Sat, 31 March 2012 11:58
		Re: A little tip By: Jerry Stuckle on Sat, 31 March 2012 13:05
		Re: A little tip By: alvaro.NOSPAMTHANX on Mon, 02 April 2012 07:42
		Re: A little tip By: M. Strobel on Mon, 02 April 2012 08:22
		Re: A little tip By: Shelly[1] on Mon, 02 April 2012 12:15
		Re: A little tip By: M. Strobel on Mon, 02 April 2012 12:27
		Re: A little tip By: Shelly[1] on Mon, 02 April 2012 13:40
		Re: A little tip By: M. Strobel on Mon, 02 April 2012 21:43

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