Question

我一直在尝试使用usort（）中包含的对象实例变量值对键控数组进行排序，它似乎不是正确使用的工具。希望有人对排序对象有一些建议，如下所示。

提前致谢！

$ary = array("apple" => object DatePrice ("date" => "2015-12-01", "price" => 3), 
               "orange" => object DatePrice ("date" => "2015-12-02", "price" => 4), 
               "banana" => object DatePrice ("date" => "2015-12-01", "price" => 0.50),
               "pear" => object DatePrice("date" => "2015-12-01", "price" => 1),
                );

期望的结果：

$ary = array("orange" =>object DatePrice("date" => "2015-12-02", "price" => 4),
              "apple" => object DatePrice("date" => "2015-12-01", "price" => 3), 
               "pear" => object DatePrice("date" => "2015-12-01", "price" => 1),
                "banana" => object DatePrice("date" => "2015-12-01", "price" => 0.50));

发现这篇文章：Sort array of objects by object fields

但我需要对键控数组进行排序..

Answer 1

像这样......

#include <string>
#include <iostream>
using namespace std;
#ifndef SCHOOL_H
#define SCHOOL_H
class School {
public:
string name;      
string state;    
int women;      
int rateAI;     
int rateSys;      
int rateTheory;  
int effectiveness;  
int ratePubs;     
int overallRating;  // overall rating that considers all of the above factors 
School ();
School (string myName, string myState, int theWomen, int myRateAI, int myRateSys,
    int myRateTheory, int myEffectiveness, int myRatePubs);
void printSchoolInfo ();
void computeRating (int weightWomen, int weightAI, int weightSys, 
            int weightTheory, int weightEffect, int    weightPubs);
};

bool operator ==(const School &x,const School &y);
bool operator >(const School &x,const School &y);
bool operator <(const School &x,const School &y);
bool operator >=(const School &x,const School &y);
bool operator <=(const School &x,const School &y);
bool operator !=(const School &x,const School &y);
#endif

对于对象，它不会改变很多，它只是一个功能，在这里检查你需要的任何东西......

uasort($ary, function ($a, $b) {
    return floatval($b['price']) - floatval($a['price']);
});

Answer 2

看看array_multisort()。使用该方法，您可以根据其键对（多维）数组进行排序，并指定其排序顺序。

按值对按键对象数组进行排序

2 个答案: