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
--
http://stut.net/
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