+- CodeIgniter Forums (https://forum.codeigniter.com)
+-- Forum: Archived Discussions (https://forum.codeigniter.com/forumdisplay.php?fid=20)
+--- Forum: Archived Development & Programming (https://forum.codeigniter.com/forumdisplay.php?fid=23)
+--- Thread: Be careful when using in_array (/showthread.php?tid=8487)
Be careful when using in_array - El Forum - 05-19-2008
[eluser]Lone[/eluser]
Came across the following whilst doing some code today - its an unexpected result (from my point of view) from using in_array(). Best explained using some code:
My array:
Code:
Array
(
[req] => 1
[name] => Email Address
[tag] => EMAIL
)My code:
Code:
if (in_array('testname',$array)) {
echo 'found';
}This would return the value of 'testname' being found which of course it was not!
After further investigation (and serializing the array) I came to realise the 'req' field is a Boolean set to TRUE (shown as 1 when using print_r()) and as a result in_array just returns TRUE regardless of the value/string even being in the array!
There is a way to fix this problem by using in_array() in 'strict' mode as follows:
Code:
in_array('testname',$array,TRUE);However the (major) downside, this will make any integers not match a number in a string (as it must use the === operator instead of ==).
In my opinion this function should default to be 'strict' when checking a boolean value and leaving 'loose' mode on for other values.
Looks like the 'loose' comparison of values got me again!
Be careful when using in_array - El Forum - 05-19-2008
[eluser]sikkle[/eluser]
hehehe anything to keep you awake lone
I think it's a good post, thanks for sharing it.
see ya around.
Be careful when using in_array - El Forum - 05-20-2008
[eluser]Crimp[/eluser]
Whenever I look up any of the PHP array functions, they're always searching for a needle in a haystack.
Do you know how HARD that is?
My advice is to not even bother using these useless functions.
Be careful when using in_array - El Forum - 05-20-2008
[eluser]xwero[/eluser]
[quote author="Crimp" date="1211285124"]Whenever I look up any of the PHP array functions, they're always searching for a needle in a haystack.
Do you know how HARD that is?
[/quote]
It's not that hard just go in with your hands and if the straw is sticking out your finger you found the needle