php函数usort使用方法示例详解

usort(array &$array, callable $cmp_function): bool

// 自定义比较函数
function compare($a, $b) {
    // 按照字符串长度进行排序
    if (strlen($a) < strlen($b)) {
        return -1;
    } elseif (strlen($a) > strlen($b)) {
        return 1;
    } else {
        return 0;
    }
}
// 要排序的数组
$array = array("apple", "banana", "cherry", "date");
// 使用 usort 函数进行排序
usort($array, "compare");
// 打印排序后的数组
print_r($array);

$arra = ['5413_BJ063','5408_BJ062','5278_BJ061','5043_BJ059','5018_BJ058','2256_BJ004','2264_BJ012','2274_BJ022'];
$arrb =[
['name'=>'11111','sn'=>'5018_BJ058','prrice'=>30],
['name'=>'22222','sn'=>'5413_BJ063','prrice'=>40],
['name'=>'33333','sn'=>'2256_BJ004','prrice'=>20],
['name'=>'4444','sn'=>'5018_BJ058','prrice'=>10],
['name'=>'5555','sn'=>'2264_BJ012','prrice'=>5],
['name'=>'6666','sn'=>'5043_BJ059','prrice'=>25],
['name'=>'77777','sn'=>'5018_BJ058','prrice'=>12],
['name'=>'88888','sn'=>'2274_BJ022','prrice'=>60],
['name'=>'99999','sn'=>'5408_BJ062','prrice'=>70],
]
foreach(array_reverse($arra) as $itemv){
	$GLOBALS['itemv'] = $itemv;
	usort($dgtop_goods, function ($a, $b) {
		if ($b['goods_sn'] == $GLOBALS['itemv']) {
			return 1;
		};
		return $a['goods_sn'] == $GLOBALS['itemv'] ? 0 : 0;
	});
}

array_reverse
usort