PHP数组操作函数

 1, 'name'=> '网易', 'sex'=> 1),
array('id'=> 2, 'name'=> '新浪', 'sex'=> 1),
array('id'=> 3, 'name'=> '腾讯', 'sex'=> 1),
array('id'=> 4, 'name'=> '阿里巴巴', 'sex'=> 1),
array('id'=> 5, 'name'=> '搜狐', 'sex'=> 1));

var_dump(array_rands($array, 0));

/*
	数组分段筛选 [可用于数组分页]
	return (array)
*/
function array_key_search($array, $limit = 5, $page = 0) {
	$page = empty($_GET['page']) || !empty($_GET['page']) && (intval($_GET['page']) < 0 || $_GET['page'] == '1') ? 0 : $_GET['page']-1; //可自己行改写
	sort($array);
	foreach($array as $key=> $val) {
		if($key < $page*$limit || $key > ($page*$limit)+$limit-1) unset($array[$key]); 
	}
	return $array;
}

/*
	数组乘积
	return (int)
*/
function array_multip($array) {
	$multip = 1;
	if(!is_array($array)) return (bool)false;
	if(empty($array)) return (int)0;
	foreach($array as $v) if(!is_numeric($v)) return false; $multip *= $v;
	return (int)$multip;
}

/*
	数组取平均值
	return (int)
*/
function array_mean($array) {
	if(!is_array($array)) return (bool)false;
	if(empty($array)) return (int)0;
	foreach($array as $v) if(!is_numeric($v)) return false;
	return array_sum($array)/count($array);
}

/*
	随机取出数组
	return (array)
*/

function array_rands($array, $rand = 0) {
	if(!is_array($array)) return (bool)false;	
	if(empty($array) || !is_numeric($rand) || is_numeric($rand) && intval($rand) === 0) return (int)0;
	if(intval($rand) >= count($array)) return (array)$array;
	$rands = array();
	while(count($rands) > intval($rand)) {
		$rand_indexes = rand(0, (count($array)-1));
		if(array_key_exists($rand_indexes, $array))$rands[] = $array[$rand_indexes];
		unset($array[$rand_indexes]);
	}
	return (array)$rands;
}