PHP Array inicializace PHP

$country[0] = "cz"                                 
$country[1] = "sk"                                 
$country[2] = "de"                                 
$country[3] = "uk"                                 
$country[4] = "fr"                                 

// this do same 
$country[] =  "cz" 
$country[] =  "sk" 
$country[] =  "de" 
$country[] =  "uk" 
$country[] =  "fr" 

// or
$country = array('cz','sk','de','uk','fr');

// get array items count                         
$length = count($country); 

for($i=0;$i<$length;$i++){
  print $country[$i].'<br>';// cz sk de uk fr
}  

                                                 
// or like this                                  
$country[50] = 'ca';                             
$country[10] = 'fr';                             
$country[20] = 'us'                              
                                                 
// now country will index 51                     
$country[] = 'ru';  

// or 
$country = array('5'=>'cz','sk','de','uk','fr'); 
/*
Array
(
    [5] => cz
    [6] => sk
    [7] => de
    [8] => uk
    [9] => fr
)
*/                            
                                                 
// you can do this                               
$country["cz"] = 1571;                           
$country["sk"] = 1572;                           
$country["de"] = 1573;                           
$country["uk"] = 1574;                           
$country["fr"] = 1575;                           
                                                 
print $country["uk"]; // 1574                           
                                                 
                                                 
// print all items key and value                         
foreach ($country as $key => $value){            
	print $key; // cz, sk, de, uk, fr              
	print $value; // 1571, 1572,  1573, 1574, 1575 
}