PHP - Arrays

php

How can we create an numerically-indexed array?

$cars = array("Volvo", "BMW", "Toyota");

or the index can be assigned manually:

$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";

How can we determine the length of a numerically-indexed array?

Use the count() function:

$cars = array("Volvo", "BMW", "Toyota");
echo count($cars);

How can we loop through a numerically-indexed array?

$cars = array("Volvo", "BMW", "Toyota");
$arrlength = count($cars);

for($x = 0; $x < $arrlength; $x++) {
    echo $cars[$x];
    echo "<br>";
}

How can we create an associative array?

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");

or:

$age['Peter'] = "35";
$age['Ben'] = "37";
$age['Joe'] = "43";

The named keys can then be used in a script:

 <?php
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
echo "Peter is " . $age['Peter'] . " years old.";
?>

How can we loop through an associative array?

To loop through and print all the values of an associative array, you could use a foreach loop, like this:

<?php
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");

foreach($age as $x => $x_value) {
    echo "Key=" . $x . ", Value=" . $x_value;
    echo "<br>";
}
?>

How can we push an element onto an array?

$data = array();
$data[] = $row;