Search in a multidimensional assoc array - php

Question

I have an array, looking like this:
[lund] => Array
(
[69] => foo
)
[berlin] => Array
(
[138] => foox2
)
[tokyo] => Array
(
[180] => foox2
[109] => Big entrance
[73] => foo
)
The thing is that there were duplicate keys, so I re-arranged them so I can search more specifically, I thought.
Previously I could just
$key = array_search('foo', $array);
to get the key but now I don't know how.
Question: I need key for value foo, from tokyo. How do I do that?

Answer 1

You can get all keys and value of foo by using this:
foreach ($array as $key => $value) {
$newArr[$key] = array_search('foo', $value);
}
print_r(array_filter($newArr));
Result is:
Array
(
[lund] => 69
[tokyo] => 109
)
If you don't mind about the hard code than you can use this:
array_search('foo', $array['tokyo']);
It just a simple example, you can modify it as per your requirement.

Answer 2

Try this
$a = array(
"land"=> array("69"=>"foo"),
"land1"=> array("138"=>"foo1"),
"land2"=> array('180' => 'foox2',
'109' => 'Big entrance',
'73' => 'foo'),
);
//print_r($a);
$reply = search_in_array($a, "foo");
print_r($reply);
function search_in_array($a, $search)
{
$result = array();
foreach($a as $key1 => $array ) {
foreach($array as $k => $value) {
if($value == "$search") {
array_push($result,"{$key1}=>{$k}");
breck;
}
}
}
return $result;
}

Answer 3

This function will return the key or null if the search value is not found.
function search($searchKey, $searchValue, $searchArr)
{
foreach ($searchArr as $key => $value) {
if ($key == $searchKey && in_array($searchValue, $value)) {
$results = array_search($searchValue, $value);
}
}
return isset($results) ? $results : null;
}
// var_dump(search('tokyo', 'foo', $array));

Answer 4

Since Question: I need key for value foo, from tokyo. How do i do that?
$key = array_search('foo', $array['tokyo']);
As a function:
function getKey($keyword, $city, $array) {
return array_search($keyword, $array[$city]);
}
// PS. Might be a good idea to wrap this array in an object and make getKey an object method.
If you want to get all cities (for example to loop through them):
$cities = array_keys($array);

Answer 5

I created solution using array iterator. Have a look on below solution:
$array = array(
'lund' => array
(
'69' => 'foo'
),
'berlin' => array
(
'138' => 'foox2'
),
'tokyo' => array
(
'180' => 'foox2',
'109' => 'Big entrance',
'73' => 'foo'
)
);
$main_key = 'tokyo'; //key of array
$search_value = 'foo'; //value which need to be search
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
foreach ($iterator as $key => $value) {
$keys = array();
if ($value == $search_value) {
$keys[] = $key;
for ($i = $iterator->getDepth() - 1; $i >= 0; $i--) {
$keys[] = $iterator->getSubIterator($i)->key();
}
$key_paths = array_reverse($keys);
if(in_array($main_key, $key_paths) !== false) {
echo "'{$key}' have '{$value}' value which traverse path is: " . implode(' -> ', $key_paths) . '<br>';
}
}
}
you can change value of $main_key and $serch_value according to your parameter. hope this will help you.

Answer 6

<?php
$lund = [
'69' => 'foo'
];
$berlin = [
'138' => 'foox2'
];
$tokyo = [
'180' => 'foox2',
'109' => 'Big entrance',
'73' => 'foo'
];
$array = [
$lund,
$berlin,
$tokyo
];
echo $array[2]['180']; // outputs 'foox2' from $tokyo array
?>

Answer 7

If you want to get key by specific key and value then your code should be:
function search_array($array, $key, $value)
{
if(is_array($array[$key])) {
return array_search($value, $array[$key]);
}
}
echo search_array($arr, 'tokyo', 'foo');

Answer 8

try this:
<?php
error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', 'On');
$array=array("lund" => array
(
69 => "foo"
),
"berlin" => array
(
138 => "foox2"
),
"tokyo" => array
(
180 => "foox2",
109 => "Big entrance",
73 => "foo"
));
function search($array, $arrkey1, $arrvalue2){
foreach($array as $arrkey=>$arrvalue){
if($arrkey == $arrkey1){
foreach($arrvalue as $arrkey=>$arrvalue){
if(preg_match("/$arrvalue/i",$arrvalue2))
return $arrkey;
}
}
}
}
$result=search($array, "tokyo", "foo"); //$array=array; tokyo="inside array to check"; foo="value" to check
echo $result;

Answer 9

You need to loop through array, since its 2 dimensional in this case. And then find corresponding value.
foreach($arr as $key1 => $key2 ) {
foreach($key2 as $k => $value) {
if($value == "foo") {
echo "{$k} => {$value}";
}
}
}
This example match key with $value, but you can do match with $k also, which in this case is $key2.