How to get numeric index of associative array in PHP?

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In PHP we can associate name/label with each array elements using => symbol. This is very helpful as it is easy to remember the element because each element is represented by the label rather than the index value.
Using array_keys() function: The array_keys() function is an inbuilt function in PHP which is used to return either all the keys of an array or the subset of the keys.

Syntax:

array array_keys( $input_array, $search_value, $strict )

Program 1: Program to get numeric index of associative array using array_keys() function.

<?php 
  
// Program to print index of an associative array 
  
// Declare an associative array 
$assoc_array=array("Geeks"=>10, "for"=>15, "zambiatek"=>20);  
  
// Print index with corresponding key 
// using array_keys() function 
print_r(array_keys($assoc_array)); 
  
?> 

Example 2: Below program uses index to access the values in associative array.

<?php 
  
// Program to print values using index 
// of associative array 
  
// Declare an associative array 
$assoc_array = array( 
    "Geeks" => 30, 
    "for" => 20, 
    "zambiatek" => 10 
);  
  
// Using array_keys() function 
$key = array_keys($assoc_array); 
  
// Calculate size of array 
$size = sizeof($key); 
  
// Using loop to access values 
for( $i = 0; $i < $size; $i++) { 
    echo "${assoc_array[$key[$i]]}\n"; 
} 
  
?> 