二维数组根据某个相同的值归类

陈于思

于 2017-12-13 09:30:12 发布

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分类专栏： php

本文链接：https://blog.youkuaiyun.com/cys7320692/article/details/78788179

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本文介绍了一种在PHP中对数组进行归类的有效方法，通过一个具体的示例展示了如何根据特定键值对数组元素进行分组，使得相同键值的所有元素能够被方便地管理和操作。

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    $arr = [
        0 => [
            "category" => "red",
            "price" => 95
        ],
        1 => [
            "category" => "blue",
            "price" => 85
        ],    
        2 => [
            "category" => "red",
            "price" => 75
        ]
    ];
    
    //我希望将以上其归类为如下数组
    
    [
        "red" => [
            0 => [
                "category" => "red",
                "price" => 95
            ],            
            1 => [
                "category" => "red",
                "price" => 75
            ]        
        ],
        "blue" => [
            0 => [
                "category" => "blue",
                "price" => 85
            ]        
        ]
    ]

方法 

 function group_same_key($arr,$key){
        $new_arr = array();
        foreach($arr as $k=>$v ){
            $new_arr[$v[$key]][] = $v;
        }
        return $new_arr;
    }