推送数组PHP的每个字段

Question

In n array which every element is an associative array,on every child array I want to push the same field with this function,but it doesn't work.

function setButton($data){
    foreach ($data as $field) {
        $field['button'] = '<input data-id="'.$field['id'].'" type="submit">';
    }
    return $data;
}

Answer 1

You are only editing the $field elements inside your foreach, but aren't actually editing your original $data array.

A foreach loop works by copying each value into a temporary variable.

If you want to edit the original array, you have two solutions :

Either pass the value with a reference, using & :

foreach ($data as &$field) {
    $field['button'] = '<input data-id="'.$field['id'].'" type="submit">';
}

Or use the $key=>$value notation and edit the original array :

foreach ($data as $key => $field) {
    $data[$key]['button'] = '<input data-id="'.$field['id'].'" type="submit">';
}