foreach doesnt do loops for my search [duplicate] - php

Question

This question already has answers here:
How can I check if an array contains a specific value in php? [duplicate]
(8 answers)
Closed 7 years ago.
i have a foreach where i want to compare some strings from two arrays
output of variable $count_land
Array
(
["US"] => 186
["DE"] => 44
["BR"] => 15
["FR"] => 3
["other"] => 7
)
Other array:
$all_lands_array = ["CN", "DE", "US", "EU", "RU", "BR", "GB", "NL", "LU", "other", "IT"];
what i need is every key in the $all_lands_array that have the same letters from the $count_land array and save them in another variable
that means i need to get US, DE, BR, FR, other and save them in a new variable
i hope you understand what i need :)
this is my loop but it doesnt find any match.. but why?
foreach($all_lands_array as $lands){
if($lands == $count_land)
return "match";
else
return "no match!";
}

Answer 1

Because you just loop through one array and then check the value against the whole other array.
Checking for country codes:
$count_land = array
(
"US" => 186,
"DE" => 44,
"BR" => 15,
"FR" => 3,
"other" => 7
);
$all_lands_array = array("CN", "DE", "US", "EU", "RU", "BR", "GB", "NL", "LU", "other", "IT");
$matches = array();
foreach($count_land as $key => $val){
if(in_array($key, $all_lands_array)){
$matches[$key] = $val; // add matches to array;
}else{
// do nothing
}
}
print_r($matches);die;
returns:
Array ( [US] => 186 [DE] => 44 [BR] => 15 [other] => 7 )

Answer 2

You have to save the countries in a variable as an array and use in_array to check if an element is in that array:
$found = array();
$countries = array_keys($count_land); //stores: US,DE..etc
foreach($all_lands_array as $country){
if(in_array($country, $countries)){ //if a country name is found in $countries array,
//OPTIONALLY: exclude 'other'
//if(in_array($country, $countries) && $country !='other')
$found[] = $country; //store them in the $found variable
}
}
Test
$count_land = array('US'=>1,'DE'=>1,'BR'=>1,'FR'=>1,'other'=>1);
$all_lands_array = ["CN", "DE", "US", "EU", "RU", "BR", "GB", "NL", "LU", "other", "IT"];
var_dump($found);
array(4) {
[0]=>
string(2) "DE"
[1]=>
string(2) "US"
[2]=>
string(2) "BR"
[3]=>
string(5) "other"
}