刪除PHP數組中的重複項

Question

我的PHP腳本正在返回一些數組，我想刪除該數組中的重複項。你能告訴我怎麼樣？我不想從PHP中刪除重複的數據。我看到了一些與此類似的問題，但我找不到解決方案。

我的PHP：

$con = mysqli_connect($host, $user, $pwd, $db); 

if(mysqli_connect_errno($con)) { 
    die("Failed to connect to MySQL: " . mysqli_connect_error()); 
} 


$sql = "SELECT Grad, Predmet FROM lista"; 
$result = mysqli_query($con, $sql); 

$rows = array(); 

while($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) { 

     $rows[] = $row; 
    } 

mysqli_close($con); 

$rows = (object) array('lista' => $rows); 
echo json_encode($rows); 

而且腳本返回此：

{"lista":[{"Grad":"Beograd","Predmet":"matematika"},{"Grad":"Novi_Sad","Predmet":"matematika"},{"Grad":"Beograd","Predmet":"matematika"},{"Grad":"Novi_Sad","Predmet":"matematika"},{"Grad":"Beograd","Predmet":"informatika"},{"Grad":"Beograd","Predmet":"informatika"}]} 

Answer 1

替換此：

$rows = (object) array('lista' => $rows); 
echo json_encode($rows); 

有了這個：

$lista = array_map('unserialize', array_unique(array_map('serialize', $rows))); 
echo json_encode((object) array('lista' => $lista)); 

Answer 2

試試這個功能從php.net文檔http://php.net/manual/en/function.array-unique.php

array array_unique (array $array [, int $sort_flags = SORT_STRING ]) 

例：

<?php 
    $input = array("a" => "green", "red", "b" => "green", "blue", "red"); 
    $result = array_unique($input); 
    print_r($result); 
?>