php从数组中随机选择若干不重复元素

php从数组中随机选择若干唯一元素

1. /*
2. * $array = the array to be filtered
3. * $total = the maximum number of items to return
4. * $unique = whether or not to remove duplicates before getting a random list
5. */
6. function unique_array($array, $total, $unique = true){
7. $newArray = array();
8. if((bool)$unique){
9. $array = array_unique($array);
10. }
11. shuffle($array);
12. $length = count($array);
13. for($i = 0; $i < $total; $i++){
14. if($i < $length){
15. $newArray[] = $array[$i];
16. }
17. }
18. return $newArray;
19. }
21. $phrases = array('Hello Sailor','Acid Test','Bear Garden','Botch A Job','Dark Horse',
22. 'In The Red','Man Up','Pan Out','Quid Pro Quo','Rub It In','Turncoat',
23. 'Yes Man','All Wet','Bag Lady','Bean Feast','Big Wig', 'Big Wig','Bear Garden'
24. ,'All Wet','Quid Pro Quo','Rub It In');
26. print_r(unique_array($phrases, 1)); // Returns 1 result
27. print_r(unique_array($phrases, 5)); // Returns 5 unique results
28. print_r(unique_array($phrases, 5, false)); // Returns 5 results, but may have duplicates if
29. // there are duplicates in original array
30. print_r(unique_array($phrases, 100)); // Returns 100 unique results
31. print_r(unique_array($phrases, 100, false)); // Returns 100 results, but may have duplicates if
32. // there are duplicates in original array