基於php中的鍵組數組值？

Question

我有一個這樣的陣列：基於「否」作爲主鍵陣列中

$str= 
    Array 
(
    [No] => 101 
    [Paper_id] => WE3P-1 
    [Title] => "a1" 
    [Author] => ABC 
    [Aff_list] => "University of South Florida, Tampa, United States" 
    [Abstracts] => "SLA" 

) 

Array 
(
    [No] => 101 
    [Paper_id] => WE3P-1 
    [Title] => "a2" 
    [Author] => DEF 
    [Aff_list] => "University of South Florida, Tampa, United States" 
    [Abstracts] => "SLA " 

) 

Array 
(
    [No] => 104 
    [Paper_id] => TU5A-3 
    [Title] => "a3" 
    [Author] => GHI 
    [Aff_list] => "University of Alcala, Alcala de Henares, Spain" 
    [Abstracts] => "Microwave" 

) 

欲組元素。輸出應該是這樣的：

array(6) { 
    ["No"]=> 
    string(6) "101" 
    ["Paper_id"]=> 
    string(6) "WE3P-1" 
    ["Title"]=> 
    string(80) ""a-1" 
    ["Author"]=> 
    string(14) "ABC" 
    ["Aff_list"]=> 
    string(51) ""University of South Florida, Tampa, United States"" 
    ["Abstracts"]=> 
    string(5) ""(SLA)" 
" 
} 
array(6) { 
    ["No"]=> 
    string(3) "104" 
    ["Paper_id"]=> 
    string(6) "TU5A-3" 
    ["Title"]=> 
    string(40) "a2" 
    ["Author"]=> 
    string(20) "DEF" 
    ["Aff_list"]=> 
    string(48) ""University of Alcala, Alcala de Henares, Spain"" 
    ["Abstracts"]=> 
    string(9) ""Microwave" 
" 
} 

注意作者的價值得到了關於合併到主鍵「No'.Can任何人幫我從這個好嗎？

我試着這樣做：

foreach($paper_info as $element) { 
    foreach($element as $v) { 
     $id = $element['No']; 
     if (!isset($out[$id])) { 
      out[$id] = array(
       'No'=>$element['No'], 
       'Paper_id' => $element['Paper_id'], 
       'Title' => $element['Title'], 
       'Authors' => array(), 
       'Aff_list' => $element['Aff_list'], 
       'Abstracts' => $element['Abstracts'] 
      ); 
     } 
     $out[$id]['Authors'][] = array('Authors' => $element['Author']); 
    } 
} 

Answer 1

你可以使用一個通用的功能：

function _group_by($array, $key) { 
    $return = array(); 
    foreach($array as $val) { 
     $return[$val[$key]][] = $val; 
    } 
    return $return; 
} 

Answer 2

在你的問題中的數據格式是模棱兩可的，但假設結構$paper_info低於什麼，這應該得到你要尋找的輸出。

$paper_info = array(
    array(
     'No' => "101", 
     'Paper_id' => "WE3P-1", 
     'Title' =>"An Electrically-Small, 3-D Cube Antenna Fabricated with Additive Manufacturing", 
     'Author' => "Ibrahim Nassar", 
     ... 
    ), 
    array(
     'No' => "101", 
     ... 
     'Author' => "Thomas Weller", 
     ... 
    ) 
); 

$out = array(); 
foreach($paper_info as $paper) { 
    $id = $paper['No']; 
    if (!isset($out[$id])) { 
     $out[$id] = $paper; 
     $out[$id]['Author'] = array(); 
    } 
    $out[$id]['Author'][] = $paper['Author']; 
} 

您還應該在開發環境中打開警告和顯示錯誤。我有一種感覺，它會幫助你。在開發過程中，您可以配置您的php.ini，或者在您的php腳本的開頭插入此代碼。只要確保在推向生產之前將其刪除。

error_reporting(E_ALL); 
ini_set('display_errors', '1');