本篇文章就是将给大家介绍在PHP中,按对象字段对对象数组排序的实现方法。
给定一个对象数组,我们按对象和给定字段对数组排序。
方法:
usort()函数是PHP中内置的函数,用于使用给定的比较器函数对元素数组进行有条件的排序。usort()函数还可以用于按对象字段对对象数组排序。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,必须在此基础上比较两个数组对象。
PHP代码示例:
<?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', $gfg_array); print("原始对象数组:\n"); print_r($school_data); usort($school_data, 'comparator'); print("\n对象数组排序:\n"); print_r($school_data);
输出:
原始对象数组: 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 ) ) 对象数组排序: 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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