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How to iterate over an associative array and get the key in PHP?

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Method 1:In this method, loop through the entire associative array using a foreach loop and display the key elements. 
Program:Program for traversing an associative array and print keys.
// We iterate over the associative array and get
// the key of the associative array 
// Associative array $person_weight = array ( "Rajnish" = > 58, "Sanjeev" = > 55, "Ravi" = > 60, "Yash" = > 60, "Suraj" = > 48 );  
// Use a for-each loop and render
// associative array key foreach ( $person_weight as $key = > $value ) { echo " Key: " . $key . "" ; }  
?>
Exit:
Key: Rajnish Key: Sanjeev Key: Ravi Key: Yash Key: Suraj 
Method 2: Using the function array_keys(): array_keys() - is a built-in PHP function that is used to return either all keys in an array or a subset of keys.Syntax:
array_keys ($input_array, $search_value , $strict) 
Program:The program below illustrates the use of the array_keys() function to access the keys of an associative array.
// Use array_keys() to display
// associative array key 
// 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 keys for ( $i = 0; $i < $size ; $i ++) { echo "key: ${key [$i]}" ; }  
?>
Exit:
key: Geeks key: for key: engineer 

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