如何访问多维数组？

Question

I am new to php. I am able to fetch the records from database and storing them into an array. Array contains more than one values for each array index. Now I want to fetch only one value. Here is my array:

Array ( [0] => Array ( [center_id] => 103 [center_strength] => 800 ) 
        [1] => Array ( [center_id] => 102 [center_strength] => 400 ) 
        [2] => Array ( [center_id] => 101 [center_strength] => 200 ) 
      )

From this array I want to get the value of [center_strength] only ie only 800 . Please Help me :)

Answer 1

Suppose your array variable name is the $array. So you can access center_strength just like $array[0]['center_strength'] and if you want iterate over all elements:

foreach($array as $single_arr) {
   //Now $single_arr contain the inner array
   foreach($single_arr as $key => $value) {
     //for first item: $key= center_id , $value=103
   }
}

Answer 2

// Printing all the keys and values one by one
    $keys = array_keys($array);
    for($i = 0; $i < count($array); $i++) {
     echo $keys[$i] . "{<br>";
     foreach($array[$keys[$i]] as $key => $value) {
       echo $key . " : " . $value . "<br>";
        }
     echo "}<br>";
    }