是否可以爲用戶只運行一次php代碼？

Question

我的例子是，如果用戶選擇apple，它將只爲該用戶運行一次代碼。我的示例代碼：

<?php 
/* 
id user_id category 
1   2  apple 
2   4  banana 
3   6  apple 
4   7  berry 
*/ 
$sql = $wpdb->get_results("SELECT category FROM $table_name WHERE user_id=1"); 
foreach($sql as $value) { 
    $category = $value -> category; 
    if ($category == 'apple') { 
     //code here only run once 
    } else { 
     //code will run as many as time if the user click 
    } 
} 
?> 

Answer 1

您可以設置像一個會話變量：

foreach($sql as $value) { 
    if($value->category == "apple" && !isset($_SESSION["yourvarname"])) { 
     //run your code once 
     $_SESSION["yourvarname"] = 1; 
    } 
    else { 
     //run your code many times 
    } 
}