arrays

[Christopher]

I am reading the php manual online and don't understand the way arrays work.
It says arrays take a key, value pair which is fine I guess, but how do I
get an old fashion c style array? Are the keys like the indices?
say I want an array that contains the numbers 0 through 10, what do I make
the keys or does it even matter?

Thanx,
Chris

[steve]

Re: arrays

"Christophe r9" wrote:[color=blue]
> I am reading the php manual online and don’t understand the way
> arrays work.
> It says arrays take a key, value pair which is fine I guess, but[/color]
how[color=blue]
> do I
> get an old fashion c style array? Are the keys like the indices?
> say I want an array that contains the numbers 0 through 10, what do[/color]
I[color=blue]
> make
> the keys or does it even matter?
>
> Thanx,
> Chris[/color]

Chris, php is easy going, and at the same time, great in managing
arrays. Compared to c, most of the hard work is done for you.

So you can say
$a = array (’x’, ’y’, 33);
then $a[0] = ’x’ and $a[1] = ’y’ and $a[2] = 33
as you see, phy is just incrementing the key as it is assigning. You
can also mix types-as php is very forgiving.

Now to add another item to the array, simply do:
$a[] = 44;
in this case $a[4] = 44

you can also set the keys to be whatever you want, e.g.
$b = array( ’key1’ => 22, ’key2’ => 55);
then $b[’key1’] = 22 ...
Also php will assign incrementing keys - in addition to the defined
keys.
So $b[0] = 22 as well.

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[Michael Fesser]

Re: arrays

.oO(steve)
[color=blue]
>you can also set the keys to be whatever you want, e.g.
>$b = array( ’key1’ => 22, ’key2’ => 55);[/color]

It's called an associative array, where the keys are strings. But in
fact there's no real difference between indexed and associative arrays,
in PHP every array is like a hashtable.
[color=blue]
>then $b[’key1’] = 22 ...
>Also php will assign incrementing keys - in addition to the defined
>keys.
>So $b[0] = 22 as well.[/color]

$b = array('key1' => 22, 'key2' => 55);
print $b[0];

--> Notice: Undefined offset: 0 ...

$b[] = 42;
print_r($b);

--> Array
(
[key1] => 22
[key2] => 55
[0] => 42
)

Micha

[steve]

Re: Re: arrays

"Michael Fesser" wrote:[color=blue]
> .oO(steve)
>[color=green]
> >you can also set the keys to be whatever you want, e.g.
> >$b = array( ’key1’ => 22, ’key2’ => 55);[/color]
>
> It’s called an associative array, where the keys are strings.
> But in
> fact there’s no real difference between indexed and associative
> arrays,
> in PHP every array is like a hashtable.
>[color=green]
> >then $b[’key1’] = 22 ...
> >Also php will assign incrementing keys - in addition to the[/color][/color]
defined[color=blue][color=green]
> >keys.
> >So $b[0] = 22 as well.[/color]
>
> $b = array(’key1’ => 22, ’key2’ => 55);
> print $b[0];
>
> --> Notice: Undefined offset: 0 ...
>
> $b[] = 42;
> print_r($b);
>
> --> Array
> (
> [key1] => 22
> [key2] => 55
> [0] => 42
> )
>
> Micha[/color]

Michael is correct, my mistake.
$b = array(’key1’ => 22, ’key2’ => 55);
print $b[0];

The keys assigned are ’key1’ and ’key2’ and there is no
auto-incremting of indecis starting with zero. So $b[0] IS undefined.

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