why we use for each loop in php code example

Example 1: foreach loop array php

foreach (array as $value){ 
  //code to be executed; 
  print("value : $value");
} 

foreach (array as  $key => $value){ 
  //code to be executed; 
  print("key[$key] => $value");
}

Example 2: loop through php array

foreach (array_expression as $value)
    statement
foreach (array_expression as $key => $value)
    statement