push element to 2D array in PHP

Question

$peter=array('cs204'=>array(10,10,10));
$peter=array('cs366'=>array(7,8,9));

echo '<pre>';
print_r($peter);
echo '</pre>';

I am trying to insert values into an array $peter with course number(cs204,cs366) as keys. Instead of adding to second element to the array it is rewriting the data. This is the current output(Actual):

Array
(
    [cs366] => Array
        (
            [0] => 7
            [1] => 8
            [2] => 9
        )

)

But I need this one as output(Expected):

Array
(
    [cs204] => Array
        (
            [0] => 10
            [1] => 10
            [2] => 10
        )

    [cs366] => Array
        (
            [0] => 7
            [1] => 8
            [2] => 9
        )

)

Please help me. I want to insert second element as: $peter=array('cs366'=>array(7,8,9)); but not like this: $peter['cs366']=array(7,8,9);

How are you getting these arrays? Also, why this $peter['cs366']=array(7,8,9); is not suitable for your purpose? — Rajdeep Paul
– Rajdeep Paul, Commented Jun 16, 2016 at 20:51
I mean, from where you getting these arrays i.e. array('cs204'=>array(10,10,10)) and array('cs366'=>array(7,8,9))? Without any proper explanation, it will be all guesswork. — Rajdeep Paul
– Rajdeep Paul, Commented Jun 16, 2016 at 21:00
I have initialized an array named $peter with index(key) cs204 and value array(10,10,10). And now I am trying to push another element to the array with key cs366 and value array(7,8,9) — user3423927
– user3423927, Commented Jun 16, 2016 at 21:05
So $peter['cs366']=array(7,8,9); suits well with your code, isn't it? Why you don't want to use it? — Rajdeep Paul
– Rajdeep Paul, Commented Jun 16, 2016 at 21:09

Oli · Accepted Answer · 2016-06-16 20:52:25Z

1

Try this:

$peter=array('cs204'=>array(10,10,10));
$peter=array_merge($peter, array('cs366'=>array(7,8,9)));

answered Jun 16, 2016 at 20:52

Oli

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4 Comments

Jonnix Over a year ago

While this would do it, it's over-thought / engineered when you can just have $peter['cs366'] = ....

Oli Over a year ago

Depends on context, if you absolutely know the key will be cs366 sure, but if not, you would be in trouble. Besides, I don't think merging two arrays with array_merge is over-thought at all, quite the contrary :-)

user3423927 Over a year ago

@oli Thank you. you gave me a satisfactory answer. If you don't mind, could you please tell me why its not working with $peter=array_push($peter, array('cs366'=>array(7,8,9))); ?

Oli Over a year ago

just remove $peter=, as array_push will add to $peter

Jason K · Accepted Answer · 2016-06-16 20:52:57Z

0

Try

 $peter['cs204']=array(10,10,10);
 $peter['cs366']=array(7,8,9);

 echo '<pre>';
 print_r($peter);
 echo '</pre>';

answered Jun 16, 2016 at 20:52

Jason K

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Comments

Chin Leung · Accepted Answer · 2016-06-16 20:55:23Z

0

Why are you not just declaring both sub-arrays at the same time?

$peter = array('cs204' => array(10, 10, 10), 'cs366' => array(7, 8, 9));

Or if you prefer multi-line:

$peter = array(
    'cs204' => array(10, 10, 10),
    'cs366' => array(7, 8, 9)
);

If you must achieve the result in two statements:

$peter = array('cs204' => array(10, 10, 10));
$peter['cs366'] => array(7, 8, 9);

answered Jun 16, 2016 at 20:55

Chin Leung

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Comments

Hozeis · Accepted Answer · 2016-06-16 20:59:28Z

0

Think this is what your going for:

$peter = array();
$peter['cs204']=array(10,10,10);
$peter['cs366']=array(7,8,9);

edited Jun 16, 2016 at 20:59

answered Jun 16, 2016 at 20:51

Hozeis

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3 Comments

Jonnix Over a year ago

Nope, consider what that would give an compare to what op is after.

user3423927 Over a year ago

That would give an array index staring from 0, which is a three dimensional array.

Hozeis Over a year ago

I edited it. if this is not what your looking for ill just delete my awnser.

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