如何从PHP中的JSON中删除密钥？

Question

如何从该JSON中删除键“src”，如果它在数组中找到？

$json = '[{"label":"360","file":"http://aaa","src":"http://aaa"}, 
{"label":"480","file":"http://bbb","src":"http://bbb"}, 
{"label":"720","file":"http://ccc","src":"http://ccc"}, 
{"label":"1080","file":"http://ddd","src":"http://ddd"}]'; 

期望的最终结果是这样的：

$json = '[{"label":"360","file":"http://aaa"}, 
{"label":"480","file":"http://bbb"}, 
{"label":"720","file":"http://ccc"}, 
{"label":"1080","file":"http://ddd"}]'; 

Answer 1

那么假设你的JSON是正确的（上面是不是因为它缺少[周围]），低于修正。

$json = '[{"label":"360","file":"http://aaa","src":"http://aaa"},{"label":"480","file":"http://bbb","src":"http://bbb"},{"label":"720","file":"http://ccc","src":"http://ccc"},{"label":"1080","file":"http://ddd","src":"http://ddd"}]'; 

$decoded = json_decode($json, true); 

foreach($decoded as $id => $row) { 
    unset($row[$id]['src']); 
} 

$json = json_encode($decoded);