为什么usort（）结果是TRUE，而不是排序数组？

Question

我需要根据另一个数组对数组进行排序，我昨天在这里问了一些问题，并得到了一些启发性答案：Sort an array by using the same order of another one。

现在我正试图通过$ array1排序$ array_sorted中使用的顺序来实现类似的任务。 这两者之间有一些区别，所以我试图编写一个适当的比较函数。

s表示“相同的花色”，o表示“不同花色”。所以“AhJs”应该变成“AJo”，与$ array_sorted进行比较。

这就是我实际写入：

function cmp($a, $b) { 

    $array_sorted = array_flip(array("AA","KK","QQ","JJ","AKs","AQs","TT","AKo","AJs","KQs","99","ATs","AQo","KJs","88","QJs","KTs","A9s","AJo","QTs","KQo","77","JTs","A8s","K9s","ATo","A7s","A5s","A7o","KJo","66","T9s","A4s","Q9s","J9s","QJo","A6s","55","A3s","K8s","KTo","98s","T8s","K7s","A2s","87s","QTo","Q8s","44","A9o","J8s","76s","JTo","97s","K6s","K5s","K4s","T7s","Q7s","K9o","65s","T9o","86s","A8o","J7s","33","54s","Q6s","K3s","Q9o","75s","22","J9o","64s","Q5s","K2s","96s","Q3s","J8o","98o","T8o","97o","A7o","T7o","Q4s","Q8o","J5s","T6o","75o","J4s","74s","K8o","86o","53s","K7o","63s","J6s","85o","T6s","76o","A6o","T2o","95s","84o","62o","T5s","95o","A5o","Q7o","T5o","87o","83o","65o","Q2s","94o","74o","54o","A4o","T4o","82o","64o","42o","J7o","93o","85s","73o","53o","T3o","63o","K6o","J6o","96o","92o","72o","52o","Q4o","K5o","J5o","43s","Q3o","43o","K4o","J4o","T4s","Q6o","Q2o","J3s","J3o","T3s","A3o","Q5o","J2o","84s","82s","42s","93s","73s","K3o","J2s","92s","52s","K2o","T2s","62s","32o","A2o","83s","94s","72s","32s")); 
    // If $a is AA and $b is J9s then 
    // $array_sorted[ 'AA' ] - $array_sorted[ 'J9s' ] 
    // will evaluate to a negative number, telling PHP that $a (AA) 
    // is "smaller" than $b (J9s) and so goes first. 
    $a1 = substr($a,0,1); 
    $a1s = substr($a,1,1); 
    $a2 = substr($a,2,1); 
    $a2s = substr($a,3,1); 
    $b1 = substr($b,0,1); 
    $b1s = substr($b,1,1); 
    $b2 = substr($b,2,1); 
    $b2s = substr($b,3,1); 
    if ($a1s == $a2s) { 
     $a = $a1.$a2."s"; 
    } 
    else if ($a1 !== $a2s) { 
     if ($a1 !== $a2) { 
      $a = $a1.$a2."o"; 
     } 
     else { 
      $a = $a1.$a2; 
     } 
    } 

    if ($b1s == $b2s) { 
     $b = $b1.$b2."s"; 
    } 
    else if ($b1 !== $b2s) { 
     if ($b1 !== $b2) { 
      $b = $b1.$b2."o"; 
     } 
     else { 
      $b = $b1.$b2; 
     } 
    } 
    //echo $a." - ".$b; 
    return $array_sorted[$a] - $array_sorted[$b]; 
    } 

$array1 = array("AhAc","AhAd","AhAs","AhKh","AhKc","AhKd","AhKs","AhQh","AhQc","AhQd","AhQs","AhJh","AhJc","AhJd","AhJs","AhTh","AhTc","AhTd","AhTs","Ah9h","Ah9c","Ah9d","Ah9s","Ah8h","Ah8c","Ah8d","Ah8s","Ah7h","Ah7c","Ah7d","Ah7s","Ah6h","Ah6c","Ah6d","Ah6s","Ah5h","Ah5c","Ah5d","Ah5s","Ah4h","Ah4c","Ah4d","Ah4s","Ah3h","Ah3c","Ah3d","Ah3s","Ah2h","Ah2c","Ah2d","Ah2s","AcAd","AcAs","AcKh","AcKc","AcKd","AcKs","AcQh","AcQc","AcQd","AcQs","AcJh","AcJc","AcJd","AcJs","AcTh","AcTc","AcTd","AcTs","Ac9h","Ac9c","Ac9d","Ac9s","Ac8h","Ac8c","Ac8d","Ac8s","Ac7h","Ac7c","Ac7d","Ac7s","Ac6h","Ac6c","Ac6d","Ac6s","Ac5h","Ac5c","Ac5d","Ac5s","Ac4h","Ac4c","Ac4d","Ac4s","Ac3h","Ac3c","Ac3d","Ac3s","Ac2h","Ac2c","Ac2d","Ac2s","AdAs","AdKh","AdKc","AdKd","AdKs","AdQh","AdQc","AdQd","AdQs","AdJh","AdJc","AdJd","AdJs","AdTh","AdTc","AdTd","AdTs","Ad9h","Ad9c","Ad9d","Ad9s","Ad8h","Ad8c","Ad8d","Ad8s","Ad7h","Ad7c","Ad7d","Ad7s","Ad6h","Ad6c","Ad6d","Ad6s","Ad5h","Ad5c","Ad5d","Ad5s","Ad4h","Ad4c","Ad4d","Ad4s","Ad3h","Ad3c","Ad3d","Ad3s","Ad2h","Ad2c","Ad2d","Ad2s","AsKh","AsKc","AsKd","AsKs","AsQh","AsQc","AsQd","AsQs","AsJh","AsJc","AsJd","AsJs","AsTh","AsTc","AsTd","AsTs","As9h","As9c","As9d","As9s","As8h","As8c","As8d","As8s","As7h","As7c","As7d","As7s","As6h","As6c","As6d","As6s","As5h","As5c","As5d","As5s","As4h","As4c","As4d","As4s","As3h","As3c","As3d","As3s","As2h","As2c","As2d","As2s","KhKc","KhKd","KhKs","KhQh","KhQc","KhQd","KhQs","KhJh","KhJc","KhJd","KhJs","KhTh","KhTc","KhTd","KhTs","Kh9h","Kh9c","Kh9d","Kh9s","Kh8h","Kh8c","Kh8d","Kh8s","Kh7h","Kh7c","Kh7d","Kh7s","Kh6h","Kh6c","Kh6d","Kh6s","Kh5h","Kh5c","Kh5d","Kh5s","Kh4h","Kh4c","Kh4d","Kh4s","Kh3h","Kh3c","Kh3d","Kh3s","Kh2h","Kh2c","Kh2d","Kh2s","KcKd","KcKs","KcQh","KcQc","KcQd","KcQs","KcJh","KcJc","KcJd","KcJs","KcTh","KcTc","KcTd","KcTs","Kc9h","Kc9c","Kc9d","Kc9s","Kc8h","Kc8c","Kc8d","Kc8s","Kc7h","Kc7c","Kc7d","Kc7s","Kc6h","Kc6c","Kc6d","Kc6s","Kc5h","Kc5c","Kc5d","Kc5s","Kc4h","Kc4c","Kc4d","Kc4s","Kc3h","Kc3c","Kc3d","Kc3s","Kc2h","Kc2c","Kc2d","Kc2s","KdKs","KdQh","KdQc","KdQd","KdQs","KdJh","KdJc","KdJd","KdJs","KdTh","KdTc","KdTd","KdTs","Kd9h","Kd9c","Kd9d","Kd9s","Kd8h","Kd8c","Kd8d","Kd8s","Kd7h","Kd7c","Kd7d","Kd7s","Kd6h","Kd6c","Kd6d","Kd6s","Kd5h","Kd5c","Kd5d","Kd5s","Kd4h","Kd4c","Kd4d","Kd4s","Kd3h","Kd3c","Kd3d","Kd3s","Kd2h","Kd2c","Kd2d","Kd2s","KsQh","KsQc","KsQd","KsQs","KsJh","KsJc","KsJd","KsJs","KsTh","KsTc","KsTd","KsTs","Ks9h","Ks9c","Ks9d","Ks9s","Ks8h","Ks8c","Ks8d","Ks8s","Ks7h","Ks7c","Ks7d","Ks7s","Ks6h","Ks6c","Ks6d","Ks6s","Ks5h","Ks5c","Ks5d","Ks5s","Ks4h","Ks4c","Ks4d","Ks4s","Ks3h","Ks3c","Ks3d","Ks3s","Ks2h","Ks2c","Ks2d","Ks2s","QhQc","QhQd","QhQs","QhJh","QhJc","QhJd","QhJs","QhTh","QhTc","QhTd","QhTs","Qh9h","Qh9c","Qh9d","Qh9s","Qh8h","Qh8c","Qh8d","Qh8s","Qh7h","Qh7c","Qh7d","Qh7s","Qh6h","Qh6c","Qh6d","Qh6s","Qh5h","Qh5c","Qh5d","Qh5s","Qh4h","Qh4c","Qh4d","Qh4s","Qh3h","Qh3c","Qh3d","Qh3s","Qh2h","Qh2c","Qh2d","Qh2s","QcQd","QcQs","QcJh","QcJc","QcJd","QcJs","QcTh","QcTc","QcTd","QcTs","Qc9h","Qc9c","Qc9d","Qc9s","Qc8h","Qc8c","Qc8d","Qc8s","Qc7h","Qc7c","Qc7d","Qc7s","Qc6h","Qc6c","Qc6d","Qc6s","Qc5h","Qc5c","Qc5d","Qc5s","Qc4h","Qc4c","Qc4d","Qc4s","Qc3h","Qc3c","Qc3d","Qc3s","Qc2h","Qc2c","Qc2d","Qc2s","QdQs","QdJh","QdJc","QdJd","QdJs","QdTh","QdTc","QdTd","QdTs","Qd9h","Qd9c","Qd9d","Qd9s","Qd8h","Qd8c","Qd8d","Qd8s","Qd7h","Qd7c","Qd7d","Qd7s","Qd6h","Qd6c","Qd6d","Qd6s","Qd5h","Qd5c","Qd5d","Qd5s","Qd4h","Qd4c","Qd4d","Qd4s","Qd3h","Qd3c","Qd3d","Qd3s","Qd2h","Qd2c","Qd2d","Qd2s","QsJh","QsJc","QsJd","QsJs","QsTh","QsTc","QsTd","QsTs","Qs9h","Qs9c","Qs9d","Qs9s","Qs8h","Qs8c","Qs8d","Qs8s","Qs7h","Qs7c","Qs7d","Qs7s","Qs6h","Qs6c","Qs6d","Qs6s","Qs5h","Qs5c","Qs5d","Qs5s","Qs4h","Qs4c","Qs4d","Qs4s","Qs3h","Qs3c","Qs3d","Qs3s","Qs2h","Qs2c","Qs2d","Qs2s","JhJc","JhJd","JhJs","JhTh","JhTc","JhTd","JhTs","Jh9h","Jh9c","Jh9d","Jh9s","Jh8h","Jh8c","Jh8d","Jh8s","Jh7h","Jh7c","Jh7d","Jh7s","Jh6h","Jh6c","Jh6d","Jh6s","Jh5h","Jh5c","Jh5d","Jh5s","Jh4h","Jh4c","Jh4d","Jh4s","Jh3h","Jh3c","Jh3d","Jh3s","Jh2h","Jh2c","Jh2d","Jh2s","JcJd","JcJs","JcTh","JcTc","JcTd","JcTs","Jc9h","Jc9c","Jc9d","Jc9s","Jc8h","Jc8c","Jc8d","Jc8s","Jc7h","Jc7c","Jc7d","Jc7s","Jc6h","Jc6c","Jc6d","Jc6s","Jc5h","Jc5c","Jc5d","Jc5s","Jc4h","Jc4c","Jc4d","Jc4s","Jc3h","Jc3c","Jc3d","Jc3s","Jc2h","Jc2c","Jc2d","Jc2s","JdJs","JdTh","JdTc","JdTd","JdTs","Jd9h","Jd9c","Jd9d","Jd9s","Jd8h","Jd8c","Jd8d","Jd8s","Jd7h","Jd7c","Jd7d","Jd7s","Jd6h","Jd6c","Jd6d","Jd6s","Jd5h","Jd5c","Jd5d","Jd5s","Jd4h","Jd4c","Jd4d","Jd4s","Jd3h","Jd3c","Jd3d","Jd3s","Jd2h","Jd2c","Jd2d","Jd2s","JsTh","JsTc","JsTd","JsTs","Js9h","Js9c","Js9d","Js9s","Js8h","Js8c","Js8d","Js8s","Js7h","Js7c","Js7d","Js7s","Js6h","Js6c","Js6d","Js6s","Js5h","Js5c","Js5d","Js5s","Js4h","Js4c","Js4d","Js4s","Js3h","Js3c","Js3d","Js3s","Js2h","Js2c","Js2d","Js2s","ThTc","ThTd","ThTs","Th9h","Th9c","Th9d","Th9s","Th8h","Th8c","Th8d","Th8s","Th7h","Th7c","Th7d","Th7s","Th6h","Th6c","Th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


$array1_sorted = usort($array1, 'cmp'); 

echo "<pre>";print_r($array1_sorted);echo "</pre>"; 

为什么的var_dump（$ array1_sorted）给出 “真” 的结果呢？

在此先感谢

Answer 1

usort回报bool，你的排序阵列在$array1。