我有这个数组
$array["4E-952778"][0]['fileName'] = "File 1";
$array["4E-952778"][0]['product'] = "Muse On Demand";
$array["4E-952778"][1]['fileName'] = "File 2";
$array["4E-952778"][1]['product'] = "Muse On Demand";
$array["15210"][0]['fileName'] = "File 3";
$array["15210"][0]['product'] = "4Manager";
$array["15210"][1]['fileName'] = "File 4";
$array["15210"][1]['product'] = "4Manager";
我试着用uasort()这样排序：
uasort($array, function ($a, $b) {
return strcmp($a['product'], $b['product']);
});
但我得到了一个错误：未定义的索引产品
试试这个：-
uasort($array, function ($a, $b) {
$i=0;
return strcmp($a[$i]['product'], $b[$i]['product']);
});