在PHP中转换数组时遇到麻烦

Question

i have this array

[ 
    [[222] => 1 [333] => 2 [444] => 0],
    [[222] => 0 [333] => 2 [444] => 1],
    [[222] => 1 [333] => 2 [444] => 0]
]

where [222], [333], [444] are student ids
and 0 means absent 1 means Present 2 means Leave

i want the output will

[ 'student_id' => '222'
  'present' => 2 /* total present*/
  'absent' => 1  /* total absent*/
  'leave'  => 0 /* total leave*/
],
[ 'student_id' => '333'
  'present' => 0 /* total present*/
  'absent' => 0  /* total absent*/
  'leave'  => 3 /* total leave*/
],

etc.

please give me some soluation in php code

Answer 1

This does exactly what you want, but this site is not a coding service, so i really think you should take the time to understand how i did, and next time try something and share it on your post:

$array = [
    [
        "222" => 1, 
        "333" => 2,
        "444" => 0
    ],
    [
        "222" => 0, 
        "333" => 2,
        "444" => 1
    ],
    [
        "222" => 1, 
        "333" => 2,
        "444" => 0
    ]
];
$results = [];
foreach($array as $k=>$v){
    foreach($v as $id=>$value){
        if(!isset($results[$id])){
            $results[$id] = [
                'student_id' => $id,
                'present' => 0,
                'absent' => 0,  
                'leave'  => 0
            ];
        }
        if($value == 0){
            $results[$id]['absent']++;
        }
        if($value == 1){
            $results[$id]['present']++;
        }
        if($value == 2){
            $results[$id]['leave']++;
        }
    }
}
$results = array_values($results);
print_r($results);

Answer 2

This looks like JSON value with there respective keys. You may do that firstly you can arrange these values in PHP ARRAY using foreach then convert that array in JSON.

foreach looping is the best way to access each key/value pair from an array.

foreach($featured as $key => $value){...}

The $key => $value in the foreach loop refers to the key-value pairs in associative arrays, where the key serves as the index to determine the value instead of a number like 0,1,2,... In PHP, associative arrays look like this

$featured = array('student_id' => '111', 'present' => '2', etc.);