Question

我需要在特定键的JSON对象中找到最小值，并用该值减去所有键。

$print = '{"Table":[
{"Column":2,"Length":1,"Number":"A4","Row":12}, 
{"Column":2,"Length":1,"Number":"A3","Row":11},
{"Column":2,"Length":1,"Number":"A2","Row":9},
{"Column":2,"Length":1,"Number":"A1","Row":8},  
{"Column":3,"Length":1,"Number":"B4","Row":12},
{"Column":3,"Length":1,"Number":"B3","Row":11},
{"Column":3,"Length":1,"Number":"B2","Row":9},
{"Column":3,"Length":1,"Number":"B1","Row":8},
{"Column":4,"Length":1,"Number":"C4","Row":12},
{"Column":4,"Length":1,"Number":"C3","Row":11},  
{"Column":4,"Length":1,"Number":"C2","Row":9},
{"Column":4,"Length":1,"Number":"C1","Row":8}],"ResponseStatus":200,"Message":null}';

在上面的JSON数据中，我想获得＆＃34; Row＆＃34;的最小值，例如，以上JSON数据的最小值ROW是＆＃34; 8＆＃34;并且我想用这个最小值减去剩余的ROW。因此，我将获得下面给出的JSON数据。

$print = '{"Table":[
    {"Column":2,"Length":1,"Number":"A4","Row":4}, 
    {"Column":2,"Length":1,"Number":"A3","Row":3},
    {"Column":2,"Length":1,"Number":"A2","Row":1},
    {"Column":2,"Length":1,"Number":"A1","Row":0},  
    {"Column":3,"Length":1,"Number":"B4","Row":4},
    {"Column":3,"Length":1,"Number":"B3","Row":3},
    {"Column":3,"Length":1,"Number":"B2","Row":1},
    {"Column":3,"Length":1,"Number":"B1","Row":0},
    {"Column":4,"Length":1,"Number":"C4","Row":4},
    {"Column":4,"Length":1,"Number":"C3","Row":3},  
    {"Column":4,"Length":1,"Number":"C2","Row":1},
    {"Column":4,"Length":1,"Number":"C1","Row":0}],"ResponseStatus":200,"Message":null}';

Answer 1

获取所有行，然后只使用min()函数。然后在获得之后，再次循环并使用引用&进行减法，然后重新编码。粗略的例子：

$rows = array();
$print = json_decode($print, true); // decode
foreach($print['Table'] as $val) { $rows[] = $val['Row']; }
$least = min($rows); // get least // $least = min(array_column($print['Table'], 'Row'));
foreach($print['Table'] as &$val) {
    $val['Row'] -= $least; // make subtractions
}
$print = json_encode($print); // re encode

Sample Output

Answer 2

如果您使用PHP＆gt; = 5.5.0：

，请使用此代码

    <?php

$print = '{"Table":[
{"Column":2,"Length":1,"Number":"A4","Row":12}, 
{"Column":2,"Length":1,"Number":"A3","Row":11},
{"Column":2,"Length":1,"Number":"A2","Row":9},
{"Column":2,"Length":1,"Number":"A1","Row":8},  
{"Column":3,"Length":1,"Number":"B4","Row":12},
{"Column":3,"Length":1,"Number":"B3","Row":11},
{"Column":3,"Length":1,"Number":"B2","Row":9},
{"Column":3,"Length":1,"Number":"B1","Row":8},
{"Column":4,"Length":1,"Number":"C4","Row":12},
{"Column":4,"Length":1,"Number":"C3","Row":11},  
{"Column":4,"Length":1,"Number":"C2","Row":9},
{"Column":4,"Length":1,"Number":"C1","Row":8}],"ResponseStatus":200,"Message":null}';


$obj = json_decode($print, true);

$min = min(array_column($obj['Table'], 'Row'));

foreach($obj['Table'] as $key => $value) {
    $obj['Table'][$key]['Row'] -= $min; 
}   

$out = json_encode($obj);

echo $out;

?>

如何在JSON中找到最小值并用该值减去其他元素？

2 个答案: