PHP having multiple "child" arrays within "parent" array and how to access them

Question

i am trying to create an array which stores various photo albums,

so far i have the following code

$photos = array(
            array("karate","1","2"),
            array("judo","1","2"),
            array("kickboxing","1","2"),
            array("womenselfdefense","1","2")
            );

$sections = array("karate","judo","kickboxing","womenselfdefense");
foreach($sections as $keys => $section)
{
    echo count($photos[$section]);
}

but i dont think i have set up my arrays properly, ideally i'd like the main array $photos to have 4 separate arrays $karate,$judo,$kickboxing,$womenselfdefense within it.

i want to start of by counting the number of items in each array and then choose a random item within each array, however i believe at the moment i have 4 unnamed arrays within the photos array and therefor my code returns several Undefined index: errors

can anyone help me with this please

We don't understand what's the purpose of this?

u_mulder
– u_mulder

2016-12-23 17:33:33 +00:00
Commented Dec 23, 2016 at 17:33 — u_mulder
– u_mulder, Commented Dec 23, 2016 at 17:33
Do a print_r($photos) that should show you your mistake

RiggsFolly
– RiggsFolly

2016-12-23 17:35:31 +00:00
Commented Dec 23, 2016 at 17:35 — RiggsFolly
– RiggsFolly, Commented Dec 23, 2016 at 17:35

Hicaro · Accepted Answer · 2018-03-07 13:34:58Z

2

You could use the name of the photo album as the key for the photos array.

$photos = array(
    "karate" => array("1","2"),
    "judo" => array("1","2"),
    "kickboxing" => array("1","2"),
    "womenselfdefense" => array("1","2")
);
$sections = array("karate","judo","kickboxing","womenselfdefense");
foreach($sections as $keys => $section)
{
    echo count($photos[$section]).'<br>';
}

edited Mar 7, 2018 at 13:34

user8280225

answered Dec 23, 2016 at 17:35

Hicaro

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3 Comments

RiggsFolly Over a year ago

But you have changed the array to suite YOUR purposes. Thats not answering the OP's question

BBLJ84 Over a year ago

this looks promising, will try it out later when i get home, many thanks!!!

Hicaro Over a year ago

@RiggsFolly I did not suit my purposes. He still has 4 separate array, however they are identified by the keyword.

miken32 · Accepted Answer · 2017-09-13 19:37:33Z

2

I think you're looking for an associative array, which uses a label instead of a number as a key:

$photos = array(
    "karate" => array("1","2"),
    "judo" => array("1","2"),
    "kickboxing" => array("1","2"),
    "womenselfdefense" => array("1","2")
);

foreach ($photos as $section=>$values) {
    //now $values is your array of numbers
    echo count($values);
}

Or, in modern syntax:

$photos = [
    "karate" => [1, 2],
    "judo" => [1, 2],
    "kickboxing" => [1, 2],
    "womenselfdefense" => [1, 2],
];

edited Sep 13, 2017 at 19:37

answered Dec 23, 2016 at 17:37

miken32

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Comments

stubben · Accepted Answer · 2016-12-23 17:37:54Z

1

You are trying to access the arrays without assigning the higher level arrays any keys.

Try something like this:

$photos = array(
    'karate' => array("karate","1","2"),
    'judo' => array("judo","1","2"),
    'kickboxing' => array("kickboxing","1","2"),
    'womenselfdefense' => array("womenselfdefense","1","2")
);

answered Dec 23, 2016 at 17:37

stubben

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Comments

Colin Schoen · Accepted Answer · 2016-12-23 17:33:29Z

0

I think you mean to use

 echo count($photos[$keys]);

answered Dec 23, 2016 at 17:33

Colin Schoen

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