PHP Array: Indexed,Associative, Multidimensional e.g.

Arrays in PHP, In this tutorial, we will discuss PHP Array: Indexed, Associative, Multidimensional.

What is Array In PHP?

Basically PHP array is a special type of variable in which is used to collect multiple data in it.

In other words, An array is a special types of variable, which can hold more than one value at a time.

Create a New Array in PHP

You can use the below syntax for creating a new array in PHP:

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

PHP Indexed Arrays

Here, we will create indexed arrays in PHP:

$lang = array("PHP", "PYTHON", "JAVASCRIPT");

Example of Indexed Arrays:

In the below example, we will create an indexed array named $lang. The $lang is contained three values.

<!DOCTYPE html>
<html>
<title>Indexed Arrays In PHP</title>
<head></head>
<body>
<?php
$lang = array("PHP", "PYTHON", "JAVASCRIPT");
echo "I like " . $lang[0] . ", " . $lang[1] . " and " . $lang[2] . ".";
?>
</body>
</html>

PHP Array Length:

PHP Count() function is used to calculate the length of the array. It will return the length of the array

<?php
$lang = array("PHP", "PYTHON", "JAVASCRIPT");
echo count($lang);
?>

Loop with Indexed Arrays In PHP

Here, you will learn, how you can use the for loop with an indexed array in PHP:

<!DOCTYPE html>
<html>
<title>Loop with Indexed Arrays In PHP</title>
<head></head>
<body>
<?php
$lang = array("PHP", "PYTHON", "JAVASCRIPT");
$arrlen = count($lang);

for($x = 0; $x < $arrlen; $x++) {
echo $lang[$x];
echo " ";
}
?>
</body>
</html>

PHP Associative Arrays

Associative Arrays in PHP. Associative arrays are used to store key value pairs.

$subjects = array("PHP"=>"50", "PYTHON"=>"55", "JAVASCRIPT"=>"45");

Example of Associative Arrays:

For example, to store the marks of the different subjects in an array, a numerically indexed array would not be the best choice.

<!DOCTYPE html>
<html>
<title>Associative Arrays In PHP</title>
<head></head>
<body>
<?php
$subjects = array("PHP"=>"50", "PYTHON"=>"55", "JAVASCRIPT"=>"45");
echo "PHP => " . $subjects['PHP'] . " ";
echo "PYTHON => " . $subjects['PYTHON'] . " ";
echo "JAVASCRIPT => " . $subjects['JAVASCRIPT'] . " ";
?>
</body>
</html>

For Loop with Associative Arrays In PHP

Here, you will learn, how you can use for loop with associative an array in PHP:

<!DOCTYPE html>
<html>
<title>For Loop with Associative Arrays In PHP</title>
<head></head>
<body>
<?php
$subjects = array("PHP"=>"50", "PYTHON"=>"55", "JAVASCRIPT"=>"45");

foreach($subjects as $x => $sub_value) {
echo "Key=" . $x . ", Value=" . $sub_value;
echo " ";
}
?>
</body>
</html>

Multidimensional Arrays In PHP

In PHP, A multidimensional array is an array containing one or more arrays in it.

We will create a multidimensional array:

$cars = array
   (
   array("Volvo",22,18),
   array("BMW",15,13),
   array("Saab",5,2),
   array("Land Rover",17,15)
   );

Example of Multidimensional Arrays

<!DOCTYPE html>
<html>
<title>Multidimensional Arrays In PHP</title>
<head></head>
<body>
<?php
$cars = array
(
array("Volvo",22,18),
array("BMW",15,13),
array("Saab",5,2),
array("Land Rover",17,15)
);

echo $cars[0][0].": In stock: ".$cars[0][1].", sold: ".$cars[0][2].". ";
echo $cars[1][0].": In stock: ".$cars[1][1].", sold: ".$cars[1][2].". ";
echo $cars[2][0].": In stock: ".$cars[2][1].", sold: ".$cars[2][2].". ";
echo $cars[3][0].": In stock: ".$cars[3][1].", sold: ".$cars[3][2].". ";

?>
</body>
</html>

For loop with Multidimensional Array in PHP:

<!DOCTYPE html>
<html>
<title>For Loop with Multidimensional Arrays In PHP</title>
<head></head>
<body>
<?php
$cars = array
(
array("Volvo",22,18),
array("BMW",15,13),
array("Saab",5,2),
array("Land Rover",17,15)
);
for ($row = 0; $row < 4; $row++) {
echo "Row number $row";
echo "<ul>";
for ($col = 0; $col < 3; $col++) {
echo "<li>".$cars[$row][$col]."</li>";
}
echo "</ul>";
}
?>
</body>
</html>

Foreach Loop Through an Associative Array PHP

See the below example for foreach loop with an associative array in PHP

<html>
<head>
<title>Foreach Loop Through an Associative Array</title>
</head>
<body>
<?php
$character = array (name=>"Joe",
occupation=>"Programmer",
age=>30,
"Learned language "=>"Java"
);
foreach ( $character as $key=>$val ){
print "$key = $val ";
}
?>
</body>
</html>

Foreach loop through multidimensional array in PHP

Foreach loop is mainly used for looping through array values. Here you will learn how you can use foreach loop with PHP arrays:

<!DOCTYPE html>
<html>
<title>For Loop with Multidimensional Arrays In PHP</title>
<head></head>
<body>
<?php
// Multidimensional array
$superheroes = array(
"spider-man" => array(
"name" => "Peter Parker",
"email" => "peterparker@mail.com",
),
"super-man" => array(
"name" => "Clark Kent",
"email" => "clarkkent@mail.com",
),
"iron-man" => array(
"name" => "Harry Potter",
"email" => "harrypotter@mail.com",
)
);

// Printing all the keys and values one by one
$keys = array_keys($superheroes);
for($i = 0; $i < count($superheroes); $i++) {
echo $keys[$i] . "{ ";
foreach($superheroes[$keys[$i]] as $key => $value) {
echo $key . " : " . $value . " ";
}
echo "} ";
}
?>

</body>
</html>