Description:
------------
array_search will return the value of the first improperly declared 0 value in the array rather than the correct result. This could be difficult for a programmer to track down; as it appears that the array_search is returning a result. Might there be a way for array_search to test the value first to prevent this from happening?

Reproduce code:
---------------
<?php
$findthis = "Assignments";
$arcat1[] = 0; //comment out this line to test
//$arcat1[] = '0'; //uncomment this line to test
$arcat1[] = "Tests";
//$arcat1[] = 0; //if this is uncommented it will falsely return a value of 2 (the key for the first non-quoted 0 value). 
// thus array_search seems to return the value of the first 0 found in the array regardless of what it is searching for I suspect the function is finding this and interpreting it as false causing the unusual behavior.
$arcat1[] = "Quizzes";
$arcat1[] = $findthis;
$arcat1[] = "Participation";
// the following search will not return the key if $arcat[] = 0;
// it will return the key if $arcat[] = '0'; interestingly enough it will also work if $arcat = 1;
$keyresult = array_search ($findthis, $arcat1);
print_r($arcat1); //the print_r result appears to be the same for $arcat[] = 0; and $arcat[] = '0';
echo "Arcat1 Key:".$keyresult;


Expected result:
----------------
I would expect array_search to return the key where the value it is searching for resides. I would not expect array_search to return the value of the first improperly declared 0 value. I have seen previously that this is not considered a bug; however, it is returning an unexpected result. If it is not corrected in the code, I would like to see a specific mention of it in the documentation.

Actual result:
--------------
Array_search returns the value of the first improperly declared 0 value. If the 0 is declared with single or double quotes the problem is avoided.