select data from array that matches condition in another array in php - php

Question

i have 2 arrays i want to display the final array as what are the array element in $displayArray only be displayed from the $firstArray
$firstArray = Array
(
[0] => Array
(
[Dis_id] => Dl-Dis1
[Dis_Desc] => Discount
[Dis_Per] => 7.500
[Dis_val] => 26.25
)
[1] => Array
(
[Dis_id] => Dl-Dis2
[Dis_Desc] => Discount
[Dis_Per] => 2.500
[Dis_val] => 8.13
)
)
$displayArray = Array
(
[0] => Array
(
[0] => Dis_id
[1] => Dis_val
)
)
i want the final output will be
$resultArray = Array
(
[0] => Array
(
[Dis_id] => Dl-Dis1
[Dis_val] => 26.25
)
[1] => Array
(
[Dis_id] => Dl-Dis2
[Dis_val] => 8.13
)
)
Both the $firstArray and the $DisplayArray are dynamic but the $displayArray should be one.
i dont know how to do give me any suggestion

Answer 1

First up, if $displayArray will never have more than one array, the answer is pretty simple. Start by popping the inner array, to get to the actual keys you will need:
$displayArray = array_pop($displayArray);//get keys
$resultArray = array();//this is the output array
foreach ($firstArray as $data)
{
$item = array();
foreach ($displayArray as $key)
$item[$key] = isset($data[$key]) ? $data[$key] : null;//make sure the key exists!
$resultArray[] = $item;
}
var_dump($resultArray);
This gives you what you need.
However, if $displayArray contains more than 1 sub-array, you'll need an additional loop
$resultArray = array();
foreach ($displayArray as $k => $keys)
{
$resultArray[$k] = array();//array for this particular sub-array
foreach ($firstArray as $data)
{
$item = array();
foreach ($keys as $key)
$item[$key] = isset($data[$key]) ? $data[$key] : null;
$resultArray[$k][] = $item;//add data-item
}
}
var_dump($resultArray);
the latter version can handle a display array like:
$displayArray = array(
array(
'Dis_id',
'Dis_val'
),
array(
'Dis_id',
'Dis_desc'
)
);
And it'll churn out a $resultArray that looks like this:
array(
array(
array(
'Dis_id' => 'foo',
'Dis_val' => 123
)
),
array(
array(
'Dis_id' => 'foo',
'Dis_desc' => 'foobar'
)
)
)
Job done