Array - custom foreach function - php

Question

I have an array in this form:
$data = array(
array(
'id' => '1',
'bar' => 'foo',
'page' => 'front',
),
array(
'id' => 'bar',
'bar' => 'foo',
'page' => 'front',
),
array(
'id' => 'different,
'bar' => 'bar',
'page' => 'back',
),
array(
'id' => 'another',
'title' => __("Custom CSS",'solidstyle_admin'),
'foo' => 'bar',
'page' => 'back',
),
);
And I want to list all ids grouped by pages and saved as variables, so if the above array is an input then output will look just like this one:
$front = array('1','bar');
$back = array('different','another');
//$data['page'] = array($id1, $id2, (...));
I was trying to do that using foreach and this is how it starts:
function my_output() {
foreach($data as $something) {
$id = $something['id'];
$page = $something['page'];
}
return $output;
}
I was trying multiple foreach loops, and the best result I got was:
front = 1
front = bar
back = different
back = another
But I have absolutely no idea how to achieve what I want to do, I don't want anyone to do my job, just any hints? Keep in mind I'm a bit new to PHP and I don't know too much about arrays.
Thank you!

Answer 1

Sounds like you want:
$ids = array();
foreach ($data as $page) {
$pageName = $page['page'];
// create an empty array for your IDs
if (!isset($ids[$pageName])) {
$ids[$pageName] = array();
}
// add to the array of IDs
$ids[$pageName][] = $page['id'];
}
var_dump($ids); // array('front' => array('1', 'bar'), ...

Answer 2

Stick with the loop idea and do a conditional check.
function my_output() {
$front = array();
$back = array();
foreach($data as $something) {
$id = $something['id'];
$page = $something['page'];
if ($page === 'front') {
$front[] = $id;
} else if ($page === 'back') {
$back[] = $id;
}
}
// Not sure what you want to return here, but you could return an array of pages
$output = array('front' => $front, 'back' => $back);
return $output;
}
This will return something similar to:
$output = array(
'front' => array(
0 => '1',
1 => 'bar',
),
'back' => array(
0 => 'something',
1 => 'another',
)
)
Edit: Keep in mind that my answer only accounts for the two pages you listed in your answer. If you have more pages you can also use what cbuckley's answer showed.