Creating an array in PHP

arrays.php

<?php
 
/* Adding items in an array implicitly. */
$junk[] = "hamburger";
$junk[] = "snack foods"; //This doesn't get displayed.
$junk[] = "pizza";
$junk[] = "carbonated beverage";
 
/* Adding items in an array explicitly. */
$junk[6] = "tacos";
$junk[7] = "gum";
$junk[8] = "candy";
$junk[1] = "potato chips"; //This reassigns a new value to line 5.
 
echo "<strong>An array of junk foods:</strong><br>";
print_r($junk); //A function to display information in human-readable form.
 
/* We can also create arrays using the array keyword. */
$foods = array("fruits", "vegetables", "proteins", "grains", "dairy");
 
echo "<br><br><strong>An array of food groups: </strong><br>";
print_r($foods);
 
/* PHP allows an array of key and value pairs known as associative arrays. */
$examples = array('fruit' => "coconut",
                  'vegetable' => "potato",
                  'protein' => "eggs",
                  'grains' => "rice");
 
$examples['dairy'] = "butter"; //Assignment by name.
 
/* Traversing through the array using the foreach...as. */
echo "<br><br><strong>An array of examples for each food group: </strong><br>";
foreach($examples as $group => $food)
  echo "$group:\t$food<br>";
 
echo "<br><strong>A question:</strong><br>";
echo "How do you like your "
     . $examples['protein'] . "?<br>"; // An example of referencing an item by name.
 
 
/* Here is an example of a multidimensional array.
 * We can create as many dimensions as we like. */
 
$groceries = array('fruits' => array(
                              'apple' => "red apple",
                              'banana' => "ripe banana",
                              'mango' => "green mango"),
                'vegetables' => array(
                              'eggplant' => "omelette",
                              'broccoli' => "steamed",
                              'carrot' => "raw"),
                'proteins' => array(
                              'fish' => "fillet",
                              'beef' => "roasted",
                              'chicken' => "fried"),
                'dairy' => array(
                             'milk' => "skimmed",
                             'yogurt' => "frozen",
                             'cheese' => "Parmesan"));
 
echo "<br><strong>More examples:</strong><br>";
foreach($groceries as $group => $names)
  foreach($names as $food => $description)
    echo "$group:\t$food\t- $description<br>";
 
?>