Multidimensional array looping (PHP) - a better way? - php

Question

Is there a better/more efficient way to loop through this data?
I need to loop through the array data with the 'Name' first and the 'ListID' second but the external API request generates the array as per the code below (the other way round).
// Array Data
$csList = array(
array(
'ListID' => 'BGERFwQTrHoseE4sweebqwyAxuJ9YU',
'Name' => 'Monthly Newsletter Subscribers'
),
array(
'ListID' => 'kHdUQMbELgMyojuATz9Dsbxz3WViVo',
'Name' => 'Special Mailout'
)
);
// Generate Array Varaibles
foreach($csList as $array => $values) {
foreach($values as $k => $v) {
for($i = 1; $i < count($csList); $i++) {
$csListData[$k][] = $v;
}
}
}
// Loop Data
for($i = 0; $i < count($csList); $i++) {
echo $csListData['Name'][$i].'<br>';
echo $csListData['ListID'][$i].'<br>';
}

Answer 1

It's not at all clear why you're rearranging the data. Loop over the array and access whatever keys you want in whatever order you want.
$csList = array(
array(
'ListID' => 'BGERFwQTrHoseE4sweebqwyAxuJ9YU',
'Name' => 'Monthly Newsletter Subscribers'
),
array(
'ListID' => 'kHdUQMbELgMyojuATz9Dsbxz3WViVo',
'Name' => 'Special Mailout'
)
);
foreach ($csList as $item) {
echo $item['Name'].'<br>';
echo $item['ListID'].'<br>';
}

Answer 2

Your inner for loop is useless. You can use the $array key to get your array as wanted :
foreach($csList as $array => $values) {
foreach($values as $k => $v) {
$csListData[$k][$array] = $v;
}
}
// Loop Data
for($i = 0, $c = count($csList); $i <$c; $i++) {
echo '<br>';
echo $csListData['Name'][$i].'<br>';
echo $csListData['ListID'][$i].'<br>';
}
Also, moving the count() out of the check will avoid to count at every iteration of the loop.

Answer 3

// Array Data
$csList = array(
array(
'ListID' => 'BGERFwQTrHoseE4sweebqwyAxuJ9YU',
'Name' => 'Monthly Newsletter Subscribers'
),
array(
'ListID' => 'kHdUQMbELgMyojuATz9Dsbxz3WViVo',
'Name' => 'Special Mailout'
)
);
You can do as follow:
$newCsList = array();
$newCsList = array_map(function ($val){
return array_reverse($val,true);
},$csList);
The result is like:
**Array (
[0] => Array (
[Name] => Monthly Newsletter Subscribers
[ListID] => BGERFwQTrHoseE4sweebqwyAxuJ9YU
)
[1] => Array (
[Name] => Special Mailout
[ListID] => kHdUQMbELgMyojuATz9Dsbxz3WViVo
)
)**
But for taking each element you can do:
$newCsList = array();
$newCsList = array_map(function ($val){
$my_test_ary = array_reverse($val);
echo $my_test_ary['Name'].'<br/>'.$my_test_ary['ListId'];
},$csList);