Add elements to an array to be used in another array - php

Question

I have the following code:
query_posts( array(
"tax_query" => array(
array(
"taxonomy" => "country",
"field" => "slug",
"terms" => array( "usa", "canada" )
)
)
) );
I also have a loop above to identify all of the "terms" like this:
$term_list = get_the_terms($post->ID,$taxonomy);
foreach($term_list as $term_single) {
echo $term_single->slug; //do something here
}
I'd like to dynamically replace "usa" and "canada" with the results from my foreach loop. How can I do that?

Answer 1

You should do something like that
function getTermsForQuery($post) {
$result = [];
$term_list = get_the_terms($post->ID,$taxonomy);
foreach($term_list as $term_single) {
$result[] = $term_single->slug; //do something here
}
return $result;
}
query_posts( array(
"tax_query" => array(
array(
"taxonomy" => "country",
"field" => "slug",
"terms" => getTermsForQuery($post)
)
)
) );

Answer 2

Without foreach Loop
$term_list = get_the_terms($post->ID,$taxonomy);
query_posts( array(
"tax_query" => array(
array(
"taxonomy" => "country",
"field" => "slug",
"terms" => $term_list
)
)
) );
With foreach loop
$term_list = get_the_terms($post->ID,$taxonomy);
foreach($term_list as $term_single) {
$cat_terms[] = $term_single;
}
query_posts( array(
"tax_query" => array(
array(
"taxonomy" => "country",
"field" => "slug",
"terms" => $cat_terms
)
)
) );

Answer 3

I have create 3 arrays then fill each one and insert to another.
//for loop, store the values that you want
$subArray2 = array();
for($row = 0;$row < 3;$row++){
$subArray2[$row] = "Value_$row";
}
$subArray1 = array("taxonomy" => "country","field" => "slug","terms" => $subArray2);
$arr = array("tax_query" => $subArray1);
//var_dump($arr);
foreach($arr as $val){
foreach($val as $val1){
if(is_array($val1)){
foreach($val1 as $val2){
echo "$val2<br>";
}
}else{
echo $val1 . "<br>";
}
}
}