PHP如何高效地對根據索引值對數組元素進行歸類?

來源:互聯網
上載者:User
關鍵字 php 數組
如以下代碼:

    $arr = [        0 => [            "category" => "red",            "price" => 95        ],        1 => [            "category" => "blue",            "price" => 85        ],            2 => [            "category" => "red",            "price" => 75        ]    ];        //我希望將以上其歸類為如下數組        [        "red" => [            0 => [                "category" => "red",                "price" => 95            ],                        1 => [                "category" => "red",                "price" => 75            ]                ],        "blue" => [            0 => [                "category" => "blue",                "price" => 85            ]                ]    ]

希望大神能給個思路,謝謝

回複內容:

如以下代碼:

    $arr = [        0 => [            "category" => "red",            "price" => 95        ],        1 => [            "category" => "blue",            "price" => 85        ],            2 => [            "category" => "red",            "price" => 75        ]    ];        //我希望將以上其歸類為如下數組        [        "red" => [            0 => [                "category" => "red",                "price" => 95            ],                        1 => [                "category" => "red",                "price" => 75            ]                ],        "blue" => [            0 => [                "category" => "blue",                "price" => 85            ]                ]    ]

希望大神能給個思路,謝謝

 [            "category" => "red",            "price" => 95        ],        1 => [            "category" => "blue",            "price" => 85        ],            2 => [            "category" => "red",            "price" => 75        ]    ];$result = array();foreach($arr as $k=>$v){    //var_dump($v);    //echo $v['price'];    $key = $v['category'];    if(!array_key_exists($key, $result)) $result[$key] =array();    $result[$key][] = $v;}var_dump($result);

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