[PHP] Arrays misbehaving!
Can anyone explain why the following code operates the way it does in my
comments?
?php
$test = array ( 'a' = 'A', 'b' = 'B', 'c' = 'C');
if (array_key_exists(2, $test)) echo It works by key number!; // Does not
work.
if (array_key_exists('c', $test)) echo It works by key name!; // Works.
print_r(array_keys($test));// outputs Array ( [0] = a [1] = b [2] =
c )
?
Any ideas? According to the documentation, it seems like I should be able
to access any key in the array by either name or number (which is what I
want to do).
-- Cameron
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Re: [PHP] Arrays misbehaving!
On Fri, 30 Aug 2002, Cameron Thorne wrote:
Can anyone explain why the following code operates the way it does in my
comments?
Sure.
?php
$test = array ( 'a' = 'A', 'b' = 'B', 'c' = 'C');
An associative array, $test.
if (array_key_exists(2, $test)) echo It works by key number!; // Does not
work.
... for subjective definitions of work. It works alright. Nothing
prints because there isn't an array key '2' in $test.
if (array_key_exists('c', $test)) echo It works by key name!; // Works.
Of course.
print_r(array_keys($test));// outputs Array ( [0] = a [1] = b [2] =
c )
You've done two things with this statement. (1) Got all the keys from
$test, then (2) printed out the keys in human readable format.
print_r() is printing information about the array which was returned from
the call to array_keys().
Examine the output from print_r($test) and check the documentation for
print_r() array_keys() to get a glimpse into what might be the source
of what's got you a bit confused.
?
Any ideas? According to the documentation, it seems like I should be able
to access any key in the array by either name or number (which is what I
want to do).
You can access array indicies by number for non-associative arrays:
$test = array( A, B, C, D );
OR associative arrays that use numbers for keys:
$test = array( 0 = A, 1 = B, 3 = C, 4 = D );
echo( $test[2] ); ... will work for either of those,
but the indicies of your original $test:
$test = array ( 'a' = 'A', 'b' = 'B', 'c' = 'C');
have to accessed with the appropriate key.
hth,
~Chris
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Re: [PHP] Arrays misbehaving!
That does help, yes. So basically there is no way to access associative arrays using numerical indices? I was hoping I could access by either name OR number, but apparently not. Thanks! -- Cameron -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Arrays misbehaving!
On Fri, 30 Aug 2002, Cameron Thorne wrote: I was hoping I could access by either name OR number, but apparently not. Just for kicks ... here's something pretty ugly (I'd never use it), but neat if you're interested (or somehow really have your heart set on using integers). There are probably a handful of other ways to do this: $test = array ( 'a' = 'A', 'b' = 'B', 'c' = 'C'); $test_keys = array_keys( $test ); print $test[$test_keys[2]]; // Prints C - Same as print $test['c']; ~Chris -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
