On Fri, 2008-11-21 at 09:11 +0000, Stut wrote:
> On 20 Nov 2008, at 23:09, Ashley Sheridan wrote:
> > On Thu, 2008-11-20 at 09:25 +0000, Stut wrote:
> >> On 20 Nov 2008, at 06:55, Yashesh Bhatia wrote:
> >>> I wanted to use in_array to verify the results of a form submission
> >>> for a checkbox and found an interesting
> >>> behaviour.
> >>>
> >>> $ php -v
> >>> PHP 5.2.5 (cli) (built: Jan 12 2008 14:54:37)
> >>> $
> >>>
> >>> $ cat in_array2.php
> >>> <?php
> >>> $node_review_types = array(
> >>> 'page' => 'page',
> >>> 'story' => 'story',
> >>> 'nodereview' => 'abc',
> >>> );
> >>>
> >>> if (in_array('page', $node_review_types)) {
> >>> print "page found in node_review_types\n";
> >>> }
> >>> if (in_array('nodereview', $node_review_types)) {
> >>> print "nodereview found in node_review_types\n";
> >>> }
> >>>
> >>> ?>
> >>> $ php in_array2.php
> >>> page found in node_review_types
> >>> $
> >>>
> >>> This works fine. but if i change the value of the key
> >>> 'nodereview' to
> >>> 0 it breaks down.
> >>>
> >>> $ diff in_array2.php in_array3.php
> >>> 6c6
> >>> < 'nodereview' => 'abc',
> >>> ---
> >>>> 'nodereview' => 0,
> >>> $
> >>>
> >>> $ php in_array3.php
> >>> page found in node_review_types
> >>> nodereview found in node_review_types
> >>> $
> >>>
> >>> Any reason why in_array is returning TRUE when one has a 0 value on
> >>> the array ?
> >>
> >> That's weird, 5.2.6 does the same thing. There's actually a comment
> >> about this on the in_array manual page from james dot ellis at gmail
> >> dot com...
> >>
> >> <quote>
> >>
> >> Be aware of oddities when dealing with 0 (zero) values in an array...
> >>
> >> This script:
> >> <?php
> >> $array = array('testing',0,'name');
> >> var_dump($array);
> >> //this will return true
> >> var_dump(in_array('foo', $array));
> >> //this will return false
> >> var_dump(in_array('foo', $array, TRUE));
> >> ?>
> >>
> >> It seems in non strict mode, the 0 value in the array is evaluating
> >> to
> >> boolean FALSE and in_array returns TRUE. Use strict mode to work
> >> around this peculiarity.
> >> This only seems to occur when there is an integer 0 in the array. A
> >> string '0' will return FALSE for the first test above (at least in
> >> 5.2.6).
> >>
> >> </quote>
> >>
> >> So use strict mode and this problem will go away. Oh, and please read
> >> the manual before asking a question in future.
> >>
> >> -Stut
> >>
> >> --
> >> http://stut.net/
> >>
> > What about using the === and !== comparisons to compare and make sure
> > that 0 is not giving a false false.
>
> That's effectively what using strict mode does. RTFM please.
>
> -Stut
>
Hey, chill. If you offer advice, don't be so offensive to everyone.
Ash
www.ashleysheridan.co.uk
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