[{"dy_count":"5000","hit_num":"5000","negative_num":"0","negative_check_num":"0","risk_num":"0","gp_num":"100","beautiful_num":"500","date":"20230501","hit_rate":"1.0000","negative_check_number_rate":null,"risk_rate":"0.0000","gp_rate":"0.0200","beautiful_rate":"0.1000"},{"dy_count":"999","hit_num":"999","negative_num":"0","negative_check_num":"0","risk_num":"0","gp_num":"0","beautiful_num":"0","date":"20230503","hit_rate":"1.0000","negative_check_number_rate":null,"risk_rate":"0.0000","gp_rate":"0.0000","beautiful_rate":"0.0000"}]将dycount 单独放入一个数组用php实现

可以使用 PHP 的 `array_column` 函数，将 "dy_count" 这个键对应的值提取出来，组成一个新的数组。示例代码如下：

$json_data = '[{"dy_count":"5000","hit_num":"5000","negative_num":"0","negative_check_num":"0","risk_num":"0","gp_num":"100","beautiful_num":"500","date":"20230501","hit_rate":"1.0000","negative_check_number_rate":null,"risk_rate":"0.0000","gp_rate":"0.0200","beautiful_rate":"0.1000"},{"dy_count":"999","hit_num":"999","negative_num":"0","negative_check_num":"0","risk_num":"0","gp_num":"0","beautiful_num":"0","date":"20230503","hit_rate":"1.0000","negative_check_number_rate":null,"risk_rate":"0.0000","gp_rate":"0.0000","beautiful_rate":"0.0000"}]';

$data = json_decode($json_data, true);

$dy_count_array = array_column($data, 'dy_count');

print_r($dy_count_array);

输出结果为：

Array
(
    [0] => 5000
    [1] => 999
)