Re: [PHP] Re: Watch out for automatic type casting

[tamouse mailing lists]

On Sat, Apr 7, 2012 at 1:55 PM, Maciek Sokolewicz
maciek.sokolew...@gmail.com wrote:
 On 07-04-2012 16:37, Bogdan Ribic wrote:
[snip]

 Bogdan,
 you are reviving a thread over a week old, and repeating what 4 other people
 have already stated. Please don't do that, it just results in
 mailinglist-noise.

 - Tul

plus, you top-posted /piling-on

-- 
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php

[PHP] Re: Watch out for automatic type casting

[Bogdan Ribic]

This is *not* typecasting at all, this is assignment of a result of 
boolean operator, and it boils down to operator precedence.


It's equivalent to this code:

$b = $x == 11;

in the part that right side of equation sign is calculated first, then 
assigned to lvalue. In effect, you wrote this:


$pos = (strpos($sText, test) !== FALSE);

You would often use something like this in code:

$isSame = $x == $y;

which would put a boolean into $isSame, not put value of $x and then 
compare it.




On 3/29/2012 18:57, Arno Kuhl wrote:

I found automatic typecasting can be a bit of a gotcha.



$sText = this.is.a.test.text;

if ( $pos = strpos($sText, test) !== FALSE) {

 echo  substr($sText, 0, $pos)..substr($sText, $pos,
strlen(test))..substr($sText, $pos+strlen(test));

}



The code seems logical enough, and the expected result would be:

this.is.a.test.text



In fact it ends up being:

this.is.a.test.text



The reason is $pos is typecast as TRUE, not int 10, presumably because it's
in the same scope as the boolean test.



--

--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php

[PHP] Re: Watch out for automatic type casting

[Maciek Sokolewicz]

On 07-04-2012 16:37, Bogdan Ribic wrote:

This is *not* typecasting at all, this is assignment of a result of
boolean operator, and it boils down to operator precedence.

It's equivalent to this code:

$b = $x == 11;

in the part that right side of equation sign is calculated first, then
assigned to lvalue. In effect, you wrote this:

$pos = (strpos($sText, test) !== FALSE);

You would often use something like this in code:

$isSame = $x == $y;

which would put a boolean into $isSame, not put value of $x and then
compare it.


Bogdan,
you are reviving a thread over a week old, and repeating what 4 other 
people have already stated. Please don't do that, it just results in 
mailinglist-noise.


- Tul


--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php