csharp，var fields = new[] { "Field1", "Field2" };，var query = from item in dataSource select new { Field1 = item.Field1, Field2 = item.Field2 };，``csharp，var fields = new[] { "Field1", "Field2" };，var query = from item in dataSource select new { Field1 = item.Field1, Field2 = item.Field2 };，``array_filter函数结合自定义回调函数来实现多条件查询数组。，，``php，$data = [， ['name' => 'Alice', 'age' => 25, 'city' => 'New York'],， ['name' => 'Bob', 'age' => 30, 'city' => 'Los Angeles'],， ['name' => 'Charlie', 'age' => 35, 'city' => 'Chicago']，];，，$result = array_filter($data, function($item) {， return $item['age'] > 25 && $item['city'] === 'Chicago';，});，，print_r($result);，``，，这段代码会筛选出年龄大于25且城市为芝加哥的记录。json_decode 函数将 JSON 字符串转换为 PHP 数组或对象。，，``php，$json = '{"name": "John", "age": 30}';，$data = json_decode($json, true); // 第二个参数为 true 时返回数组，echo $data['name']; // 输出 John，``Powered By Z-BlogPHP 1.7.3
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