PHP按對象字段對對象數組進行排序的方法

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按對象字段對對象數組排序的實現方法;

給定一個對象數組，我們按對象和給定字段對數組排序。

方法:

usort()函數是PHP中內置的函數，用于使用給定的比較器函數對元素數組進行有條件的排序。usort()函數還可以用于按對象字段對對象數組排序。調用usort()函數，第一個參數作為對象數組，第二個參數作為比較器函數，必須在此基礎上比較兩個數組對象。

PHP代碼示例：

<?php 
  
$gfg_array = array( 
    array( 
        'score' => '100', 
        'name' => 'Sam', 
        'subject' => 'Data Structures'
    ), 
    array( 
        'score' => '50', 
        'name' => 'Tanya', 
        'subject' => 'Advanced Algorithms'
    ), 
    array( 
        'score' => '75', 
        'name' => 'Jack', 
        'subject' => 'Distributed Computing'
    ) 
); 
  
class geekSchool {  
    var $score, $name, $subject; 
    
    public function geekSchool($data) { 
        $this->name = $data['name']; 
        $this->score = $data['score']; 
        $this->subject = $data['subject']; 
    } 
} 
  
function data2Object($data) { 
    $class_object = new geekSchool($data); 
    return $class_object; 
}  

function comparator($object1, $object2) { 
    return $object1->score > $object2->score; 
} 
  
$school_data = array_map('data2Object', $gfg_array); 
  
print("原始對象數組:\n"); 
  
print_r($school_data); 
  
usort($school_data, 'comparator'); 
  
print("\n對象數組排序:\n"); 
  
print_r($school_data);

輸出：

原始對象數組:
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
        )

)

對象數組排序:
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
        )

)

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