Php Array

An array stores multiple values in one single variable:

<?php
$cars = array("Volvo", "BMW", "Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>

What is an Array?

An array is a special variable, which can hold more than one value at a time.

Create an Array in PHP

In PHP, the array() function is used to create an array:

In PHP, there are three types of arrays:

• Indexed arrays - Arrays with a numeric index
• Associative arrays - Arrays with named keys
• Multidimensional arrays - Arrays containing one or more arrays

Get The Length of an Array - The count() Function

The count() function is used to return the length (the number of elements) of an array:

<?php
$cars = array("Volvo", "BMW", "Toyota");
echo count($cars);
?>

PHP Indexed Arrays

There are two ways to create indexed arrays:

The index can be assigned automatically (index always starts at 0), like this:

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

or the index can be assigned manually:

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

The following example creates an indexed array named $cars, assigns three elements to it, and then prints a text containing the array values:

<?php
$cars = array("Volvo", "BMW", "Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>

Loop Through an Indexed Array

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

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

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

Volvo
BMW
Toyota

Associative Array

Associative arrays are arrays that use named keys that you assign to them.

There are two ways to 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

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>";
}
?>

PHP - Multidimensional Arrays

A multidimensional array is an array containing one or more arrays.

PHP supports multidimensional arrays that are two, three, four, five, or more levels deep. However, arrays more than three levels deep are hard to manage for most people.

For a two-dimensional array you need two indices to select an element

For a three-dimensional array you need three indices to select an element

<?php
$students = array (
  array(1,"Aryan","Game Developer"),
  array(2,"Rankush","Full Stack web developer"),
  array(3,"Vinay","Graphic Designer"),
  array(4,"Rohan","Frontend Developer")
);
for ($row = 0; $row < 4; $row++) {
  echo "<p><b>Row number $row</b></p>";
  echo "<ul>";
  for ($col = 0; $col < 3; $col++) {
    echo "<li>".$students[$row][$col]."</li>";
  }
  echo "</ul>";
}
?>

Now that you have done arrays in Php, let's learn constants in php

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