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]

"Christopher9" wrote:

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

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]

.oO(steve)

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

$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]

"Michael Fesser" wrote:

.oO(steve)

you can also set the keys to be whatever you want, e.g.
$b = array( ’key1’ => 22, ’key2’ => 55);

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.

then $b[’key1’] = 22 ...
Also php will assign incrementing keys - in addition to the definedkeys.
So $b[0] = 22 as well.

$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

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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