Show how to iterate over the key-value pairs of an associative array, and print each pair out.

Also show how to iterate just over the keys, or the values, if there is a separate way to do that in your language.



See also

 Array
 Associative array: Creation, Iteration
 Collections
 Compound data type
 Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
 Linked list
 Queue: Definition, Usage
 Set
 Singly-linked list: Element definition, Element insertion, List Traversal, Element Removal
 Stack


<?php
$pairs = array( "hello" => 1,
		"world" => 2,
		"!"     => 3 );
 
// iterate over key-value pairs
foreach($pairs as $k => $v) {
  echo "(k,v) = ($k, $v)\n";
}
 
// iterate over keys
foreach(array_keys($pairs) as $key) {
  echo "key = $key, value = $pairs[$key]\n";
}
 
// iterate over values
foreach($pairs as $value) {
  echo "values = $value\n";
}
?>