Php 带有while循环输出的mysqli搜索只返回一条记录

只是学习了PHP并遇到了在搜索结果中输出多个值的问题

在一个数据库中有多个具有相同姓氏的事务，希望用户在“搜索”框中输入姓氏并获取所有事件，当前结构仅提供一个。感谢你的帮助。多谢各位

在函数中具有以下SQL查询：

function search_transactions_ln($x){
    global $connection;

    $query  = "SELECT ALL * ";
    $query .= "FROM transactions ";
    $query .= "WHERE last_name = '{$x}' ";
    $query .= "LIMIT 50";
    $a3 = mysqli_query($connection, $query);
    confirm_query($a3);
    while ($a4 = mysqli_fetch_array ($a3)) {
        return $a4;
    }
}

使用以下代码检索结果，包括$\u POST：

if(isset($_POST['submit'])) {
    $last_name = $_POST["ln"];
    $found_transaction = search_transactions_ln($last_name);

    if ($found_transaction) {
        print $found_transaction["last_name"]; **==>>> this produces one result, want to see multiple**
    } else {
        // Failure
        $_SESSION ["message"] = "Last name not found.
    }                  
}

---

您只返回一个字符串，而不是所有结果

如果要打印所有这些文件，必须首先将它们收集到一个数组中，然后返回该数组

您可能需要更改您的功能：

function search_transactions_ln($x){
    global $connection;

    $query  = "SELECT ALL * ";
    $query .= "FROM transactions ";
    $query .= "WHERE last_name = '{$x}' ";
    $query .= "LIMIT 50";
    $a3 = mysqli_query($connection, $query);
    confirm_query($a3);

    $results = array();
    while ($a4 = mysqli_fetch_array ($a3)) {
      $results[] = $a4;
    }

    return $results;
}

while ($a4 = mysqli_fetch_array ($a3)) {
   return $a4;
}

---

您还必须更改打印以打印所有结果。

您只能从函数返回第一个结果：

function search_transactions_ln($x){
    global $connection;

    $query  = "SELECT ALL * ";
    $query .= "FROM transactions ";
    $query .= "WHERE last_name = '{$x}' ";
    $query .= "LIMIT 50";
    $a3 = mysqli_query($connection, $query);
    confirm_query($a3);

    $results = array();
    while ($a4 = mysqli_fetch_array ($a3)) {
      $results[] = $a4;
    }

    return $results;
}

while ($a4 = mysqli_fetch_array ($a3)) {
   return $a4;
}

将其更改为：

return $a3;

您还应该使用准备好的语句，而不是直接向查询中注入变量，因为您有sql注入问题

        function search_transactions_ln($x){
            global $connection;

            $query  = "SELECT ALL * ";
            $query .= "FROM transactions ";
            $query .= "WHERE last_name = '{$x}' ";
            $query .= "LIMIT 50";
            $a3 = mysqli_query($connection, $query);
            confirm_query($a3);
            $ans =array();
            while ($a4 = mysqli_fetch_array ($a3)) {
              $ans[] = $a4;
            }
           return $ans;
       }

在调用php文件中：

if(isset($_POST['submit'])) {

    $last_name = $_POST["ln"];

    $found_transaction_array = search_transactions_ln($last_name);

   foreach($found_transaction_array as $a){

      // do your task
    }

---

您确实应该避免使用全局变量。。这是个坏习惯