Search multidimensional arrays for specific keys and output their data

Question

I have following array construction: $array[$certain_key][some_text_value]

And in a while loop, I want to print the data from the array, where $certain_key is a specific value.

I know how to loop through multidimensional arrays, which is not the complete solution to this problem:

foreach ($a as $v1) {
    foreach ($v1 as $v2) {
        echo "$v2\n";
    }
}

I do not want to loop the whole array each time, but only when $certain_key is matched.

EDIT: to be more exact, this is what I'm trying to do:

$array[$array_key][some_text];

while reading from db {

  //print array where a value returned from the db = $array_key

}

Answer 1

while ($row = fetch()) {
   if (isset($array[$row['db_id']])) {
      foreach ($array[$row['db_id']] as $some_text_value => $some_text_values_value) {
         echo ...
      }
   }
}

Answer 2

foreach ($array as $certain_key => $value) {
    if($certain_key == $row['db_id']) {
        foreach ($value as $some_text_value) {
            echo "$v2\n";
        }
    }
}

Answer 3

You mean like

foreach($array[$certain_key] as $k => $v)
{
     do_stuff();
}

?

Answer 4

Maybe you're looking for array_key_exists? It works like this:

if(array_key_exists($certain_key, $array)) {
   // do something
}

Answer 5

<?php

foreach ($a as $idx => $value) {
    // replace [search_value] with whatever key you are looking for
    if ('[search_value]' == $idx) {
        // the key you are looking for is stored as $idx
        // the row you are looking for is stored as $value
    }
}