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Bug #15468 problem with array_key_exists
Submitted: 2002-02-09 13:20 UTC Modified: 2002-02-09 14:36 UTC
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: paja at onride dot com Assigned:
Status: Not a bug Package: Arrays related
PHP Version: 4.1.1 OS: Linux d2 2.2.20-ow1-procmax-smp
Private report: No CVE-ID: None
 [2002-02-09 13:20 UTC] paja at onride dot com

I'm trying function array_key_exists in this sample script, but doesn't work:

$pole = array(1 => "ap", "aa", "dd");
if (array_key_exists($a, $pole)):
    echo "The element is in the array";

but when using:

$pole = array("ap" => 1, "aa" => 2, "dd" => 3);

it's working. Can somebody look at this problem?

Pavel Hrabal


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 [2002-02-09 13:39 UTC]
Simple because 'ap' is NOT a key in the first case. See yourself with var_dump($pole); how the array looks like.
 [2002-02-09 13:55 UTC] paja at onride dot com
first case:

array(3) { [1]=> string(2) "ap" [2]=> string(2) "aa" [3]=> string(2) "dd" } 

second case:

array(3) { ["ap"]=> int(1) ["aa"]=> int(2) ["dd"]=> int(3) } 

Why is this different? Shouldn't this be the same?

as Array() definition says: 

Syntax "index => values", separated by commas, define index and values. index may be of type string or numeric. When index is omitted, a integer index is automatically generated, starting at 0. If index is an integer, next generated index will be the biggest integer index + 1. Note that when two identical index are defined, the last overwrite the first.

So I have used in first case the Example 3. 1-based index with array():

$firstquarter  = array(1 => 'January', 'February', 'March');

I thing, that the second case definition is wrong and should return error, but as I see, the function array_key_exists works with this... I'm I mad or what???
 [2002-02-09 14:14 UTC] paja at onride dot com
for Can you explain me your words:

Simple because 'ap' is NOT a key in the first case.


Just don't know, what you mean...
 [2002-02-09 14:31 UTC]
$pole = array(1 => "ap", "aa", "dd");

$pole = array("ap" => 1, "aa" => 2, "dd" => 3);
               |          |          |
               |          |          |
              Key        Key        Key

This is what he means, ap is NOT a KEY in the first array it is a VALUE.

The function you want is in_array() -


 [2002-02-09 14:36 UTC] paja at onride dot com
Got it, thanks a lot. One hint - maybe someone should add to manual, what is key and what is it not....
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