PHP按对象字段对对象数组进行排序

给定一个对象数组，任务是按给定字段按对象对数组进行排序。

方法：
usort()函数是PHP的一个内置函数，用于使用给定的比较器函数有条件地对元素数组进行排序。 usort()函数还可用于按对象字段对对象数组进行排序。调用 usort()函数，第一个参数作为对象数组，第二个参数作为比较器函数，在此基础上必须进行两个数组对象之间的比较。

例子：

 '100',
        'name' => 'Sam',
        'subject' => 'Data Structures'
    ),
    array(
        'score' => '50',
        'name' => 'Tanya',
        'subject' => 'Advanced Algorithms'
    ),
    array(
        'score' => '75',
        'name' => 'Jack',
        'subject' => 'Distributed Computing'
    )
);
  
// Class for encapsulating school data
class geekSchool {
      
    var $score, $name, $subject;
  
    // Constructor for class initialization
    public function geekSchool($data) {
        $this->name = $data['name'];
        $this->score = $data['score'];
        $this->subject = $data['subject'];
    }
}
  
// Function to convert array data to class object
function data2Object($data) {
    $class_object = new geekSchool($data);
    return $class_object;
}
  
// Comparator function used for comparator
// scores of two object/students
function comparator($object1, $object2) {
    return $object1->score > $object2->score;
}
  
// Generating array of objects
$school_data = array_map('data2Object', $gfg_array);
  
// Printing original object array data
print("Original object array:\n");
  
print_r($school_data);
  
// Sorting the class objects according 
// to their scores
usort($school_data, 'comparator');
  
// Printing sorted object array data
print("\nSorted object array:\n");
  
print_r($school_data);
  
?>

输出：

Original object array:
Array
(
    [0] => geekSchool Object
        (
            [score] => 100
            [name] => Sam
            [subject] => Data Structures
        )

    [1] => geekSchool Object
        (
            [score] => 50
            [name] => Tanya
            [subject] => Advanced Algorithms
        )

    [2] => geekSchool Object
        (
            [score] => 75
            [name] => Jack
            [subject] => Distributed Computing
        )

)

Sorted object array:
Array
(
    [0] => geekSchool Object
        (
            [score] => 50
            [name] => Tanya
            [subject] => Advanced Algorithms
        )

    [1] => geekSchool Object
        (
            [score] => 75
            [name] => Jack
            [subject] => Distributed Computing
        )

    [2] => geekSchool Object
        (
            [score] => 100
            [name] => Sam
            [subject] => Data Structures
        )

)