I stuck on this and really don’t know how to solve it. I have two multi-dimensional arrays and need to match every “entry_id” from second array with first one. Then need to check if every “file_no” from second array is in database (first array) and “status” are matched with 1st array . If “status” is different, update second array with string (e.g. updated value) like this:
...
[status] => Array
(
[0] => abc
[1] => defghijk - "updated value"
)
So I have first array from database:
Array
(
[0] => Array
(
[entry_id] => 1
[file_no] => KSBR 40 INS 3674 / 2014
[status] => abc
)
[1] => Array
(
[entry_id] => 9
[file_no] => KSUL 77 INS 18898 / 2013
[status] => abc
)
[2] => Array
(
[entry_id] => 9
[file_no] => KSUL 77 INS 21218 / 2013
[status] => defg
)
)
And second array generated from script:
Array
(
[0] => Array
(
[entry_id] => 1
[id] => 500910/098
[fullname] => Milan Vrtal
[type] => person
[file_no] => Array
(
[0] => KSBR 26 INS 37146 / 2013
[1] => KSBR 40 INS 3674 / 2014
)
[status] => Array
(
[0] => status1
[1] => status2
)
)
[1] => Array
(
[entry_id] => 2
[id] => 46900217
[fullname] => ENTEC a.s.
[type] => company
[file_no] => Array
(
[0] => KSBR 28 INS 1232 / 2013
)
[status] => Array
(
[0] => qwer
)
)
[2] => Array
(
[entry_id] => 9
[fullname] => Blanka Kořínková
[type] => person
[file_no] => Array
(
[0] => KSUL 77 INS 18898 / 2013
[1] => KSUL 77 INS 21218 / 2013
)
[status] => Array
(
[0] => abc
[1] => defghijk
)
)
)
Thanks for every comment and sorry for english 🙂
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Answer
This is by creating a temporary array to search in. This will use quite some memory when the arrays are big, but will result in faster execution time…
$tmparr = array();
foreach($arr1 as $arr1_val)
{
//put an new element in $temparr with key 'entry_id' and an array as value
if (!isset($tmparr[$arr1_val['entry_id']]))
$tmparr[$arr1_val['entry_id']] = array();
//add the status to the array
$tmparr[$arr1_val['entry_id']][] = $arr1_val['status'];
}
/*
$tmparr = Array
(
[1] => Array
(
[0] => abc
)
[9] => Array
(
[0] => abc
[1] => defg
)
)
*/
//arr2_val by reference so that we can change it
foreach($arr2 as &$arr2_val)
{
//get the current entry_id
$entry_id = $arr2_val['entry_id'];
//see if this entry_id was in the first array, and if so...
if (isset($tmparr[$entry_id]))
{
//change the status to both the original status and the status of the first array
$arr2_val['status'] = array_merge($arr2_val['status'],$tmparr[$entry_id]);
}
}
print_r($arr2);
Output:
Array
(
[0] => Array
(
[entry_id] => 1
[id] => 500910/098
[fullname] => Milan Vrtal
[type] => person
[file_no] => Array
(
[0] => KSBR 26 INS 37146 / 2013
[1] => KSBR 40 INS 3674 / 2014
)
[status] => Array
(
[0] => status1
[1] => status2
[2] => abc
)
)
[1] => Array
(
[entry_id] => 2
[id] => 46900217
[fullname] => ENTEC a.s.
[type] => company
[file_no] => Array
(
[0] => KSBR 28 INS 1232 / 2013
)
[status] => Array
(
[0] => qwer
)
)
[2] => Array
(
[entry_id] => 9
[fullname] => Blanka Kořínková
[type] => person
[file_no] => Array
(
[0] => KSUL 77 INS 18898 / 2013
[1] => KSUL 77 INS 21218 / 2013
)
[status] => Array
(
[0] => abc
[1] => defghijk
[2] => abc
[3] => defg
)
)
)
edit: This is possible too, whitout the temp array, but with a loop in a loop. This will be slower than the first one, but will consume less memory:
//arr2_val by reference so that we can change it
foreach($arr2 as &$arr2_val)
{
//get the current entry_id
$entry_id = $arr2_val['entry_id'];
//search for the correct row in the first array
foreach($arr1 as $arr1_val)
{
if ($arr1_val['entry_id'] == $arr2_val['entry_id'])
{
$arr2_val['status'][] = $arr1_val['status'];
//a continue should be added here to make it faster...
}
}
}
print_r($arr2);