Associative array - types of array in PHP

Associative array is an second type of array.
You can define associative array in following two ways:

$variable_name = array(key1 => value1, key2 => value2, key3 => value3...key n => value n);

1	$variable_name = array(key1 => value1, key2 => value2, key3 => value3...key n => value n);

$variable_name["key1"] = "value1";
$variable_name["key2"] = "value2";
$variable_name["key3"] = "value3";

$variable_name["key1"] = "value1";

$variable_name["key2"] = "value2";

$variable_name["key3"] = "value3";

Example

<?php

$Marks = array("Maths" => "60", "Science" => "45", "English" => "35");
echo "A student got marks in maths is ". $Marks["Maths"]."<br>";  
echo "A student got marks in science is ". $Marks["Science"]."<br>";  
echo "A student got marks in english is ". $Marks["English"]."<br>";  

?>

<?php

$Marks = array("Maths" => "60", "Science" => "45", "English" => "35");

echo "A student got marks in maths is ". $Marks["Maths"]." ";

echo "A student got marks in science is ". $Marks["Science"]." ";

echo "A student got marks in english is ". $Marks["English"]." ";

Output:

A student got marks in maths is 60
A student got marks in science is 45
A student got marks in english is 35

A student got marks in maths is 60

A student got marks in science is 45

A student got marks in english is 35

<?php
$Marks["Maths"] = "60";
$Marks["Science"] = "45";
$Marks["English"] = "35";
echo "A student got marks in maths is ". $Marks["Maths"]."<br>";  
echo "A student got marks in science is ". $Marks["Science"]."<br>";  
echo "A student got marks in english is ". $Marks["English"]."<br>";  
?>

<?php

$Marks["Maths"] = "60";

$Marks["Science"] = "45";

$Marks["English"] = "35";