php从数组随机选择若干不重复元素的解决办法

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/**
 * php从数组中随机选择若干不重复元素
 *
 * @param 
 * @arrange 512-笔记网： www.idcnote.com
 * $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
/***   来自php教程（www.idcnote.com）   ***/

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