排序陣列，按名稱

Question

輸入：

$sql = array(

    array("id"=>"47", "name"=>"Jason", "device"=>"idevice"), 
    array("id"=>"49", "name"=>"uniKornn", "device"=>"idevice"), 
    array("id"=>"50", "name"=>"jacob", "device"=>"idevice") 
) 

輸出：

$sql = array(

    array("id"=>"50", "name"=>"jacob", "device"=>"idevice"), 
    array("id"=>"47", "name"=>"Jason", "device"=>"idevice"), 
    array("id"=>"49", "name"=>"uniKornn", "device"=>"idevice") 
) 

我想設置數組$ SQL的順序，按名稱，和不區分大小寫的。

Answer 1

function build_sorter($key) { 
    return function ($a, $b) use ($key) { 
     return strnatcmp($a[$key], $b[$key]); 
    }; 
} 

usort($sql, build_sorter('name')); 

編輯：對於不區分大小寫：

選項1：

function build_sorter($key) { 
    return function ($a, $b) use ($key) { 
     return strnatcasecmp($a[$key], $b[$key]); 
    }; 
} 

usort($sql, build_sorter('name')); 

選項2：

function build_sorter($key) { 
    return function ($a, $b) use ($key) { 
     return strnatcmp(strtolower($a[$key]), strtolower($b[$key])); 
    }; 
} 

usort($sql, build_sorter('name')); 

全碼：

<?php 

$sql = array(
    array("id"=>"47", "name"=>"Jason", "device"=>"idevice"), 
    array("id"=>"49", "name"=>"uniKornn", "device"=>"idevice"), 
    array("id"=>"50", "name"=>"jacob", "device"=>"idevice") 
); 

function build_sorter($key) { 
    return function ($a, $b) use ($key) { 
     return strnatcmp(strtolower($a[$key]), strtolower($b[$key])); 
    }; 
} 

usort($sql, build_sorter('name')); 

foreach ($sql as $item) { 
    echo $item['id'] . ', ' . $item['name'] .', ' . $item['device'] . "\n"; 
} 

?> 

Answer 2

或短版本的字符串

function cmp($a, $b) 
{ 
    return strcmp($a["name"], $b["name"]); 
} 

usort($array, "cmp");