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How do I get the numeric index of an associative array in PHP?

|
Syntax:
array array_keys ($input_array, $search_value, $strict) 
Program 1:Program for getting the numeric index of an associative array using the array_keys() function.  
// Program for printing the associative array index 
// Declare an associative array $assoc_array = array ( " Geeks " = > 10, "for" = > 15, "engineer" = > 20);  
// Print the index with the corresponding key // using the array_keys() function print_r ( array_keys ( $assoc_array ));  
?>
Example 2:Below is the program uses the index to access the values ​​in the associative array.  
// Program for printing values ​​using an index
// associative array 
// Declare an associative array $assoc_array = array ( "Geeks" = > 30, "for" = > 20, "engineer" = > 10 );  
// Using the array_keys() function $key = array_keys ( $assoc_array );  
// Calculate array size $size = sizeof ( $key );  
// Using a loop to access values ​​ for ( $i = 0; $i < $size ; $i ++) { echo "${assoc_array [$key [$i]]}" ; }  
?>

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