php encontrar las diferencias entre dos matrices
<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);
?>
Array
(
[1] => blue
)
en java cómo comparar dos cadenas de caracteres
class scratch{
public static void main(String[] args) {
String str1 = "Nyello";
String str2 = "Hello";
String str3 = "Hello";
System.out.println( str1.equals(str2) ); //prints false
System.out.println( str2.equals(str3) ); //prints true
}
}