PHP Associative Arrays

An array with strings as index. This stores element values in association with key values rather than in a strict linear index order.

There are two ways to define associative array:

1st way :

$salary=array("Rahul"=>"50000","Amit"=>"40000","Sourav"=>"60000");

2nd way:

$salary["sumit"]="40000";  
$salary["ravi"]="50000";  
$salary["sourav"]="60000";

Example -1 :

<?php    
$salary=array("Rahul"=>"50000","Amit"=>"40000","Sourav"=>"60000"); 
echo "Rahul salary: ".$salary["Rahul"]."<br/>";  
echo "Amit salary: ".$salary["Amit"]."<br/>";  
echo "Sourav salary: ".$salary["Sourav"]."<br/>";  
?>

Output:
-------------------
Rahul salary: 50000
Amit salary: 40000
Sourav salary: 60000

Example -2 :

<?php    
$salary["sumit"]="40000";  
$salary["ravi"]="50000";  
$salary["sourav"]="60000";
echo "sumit salary: ".$salary["sumit"]."<br/>";  
echo "ravi salary: ".$salary["ravi"]."<br/>";  
echo "sourav salary: ".$salary["sourav"]."<br/>";  
?>

Output :
------------------
sumit salary: 40000
ravi salary: 50000
sourav salary: 60000

Example - 3 : (Traverse PHP Associative Array)
Lets see the below example we are using for each loop to traverse each element of associate array.

<?php    
$salary=array("Rahul"=>"50000","Amit"=>"40000","Sourav"=>"60000");  
foreach($salary as $key => $value) {  
echo "Key: ".$key." Value: ".$value."<br/>";  
}  
?>

Output:
--------------------
Key: Rahul Value: 50000
Key: Amit Value: 40000
Key: Sourav Value: 60000

Example -4 : (Count the number of elements in associate array)
Let see the below example we are using count function to get the number of elements in array.

<?php    
$salary=array("Rahul"=>"50000","Amit"=>"40000","Sourav"=>"60000");  
echo count($salary);  
?>

Output:
-------------------------
3