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php从数组中随机选择若干唯一元素
-
- /*
- * $array = the array to be filtered
- * $total = the maximum number of items to return
- * $unique = whether or not to remove duplicates before getting a random list
- */
- function unique_array($array, $total, $unique = true){
- $newArray = array();
- if((bool)$unique){
- $array = array_unique($array);
- }
- shuffle($array);
- $length = count($array);
- for($i = 0; $i < $total; $i++){
- if($i < $length){
- $newArray[] = $array[$i];
- }
- }
- return $newArray;
- }
-
- $phrases = array('Hello Sailor','Acid Test','Bear Garden','Botch A Job','Dark Horse',
- 'In The Red','Man Up','Pan Out','Quid Pro Quo','Rub It In','Turncoat',
- 'Yes Man','All Wet','Bag Lady','Bean Feast','Big Wig', 'Big Wig','Bear Garden'
- ,'All Wet','Quid Pro Quo','Rub It In');
-
- print_r(unique_array($phrases, 1)); // Returns 1 result
- print_r(unique_array($phrases, 5)); // Returns 5 unique results
- print_r(unique_array($phrases, 5, false)); // Returns 5 results, but may have duplicates if
- // there are duplicates in original array
- print_r(unique_array($phrases, 100)); // Returns 100 unique results
- print_r(unique_array($phrases, 100, false)); // Returns 100 results, but may have duplicates if
- // there are duplicates in original array
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