在实时 ajax 搜索中搜索时出现致命错误

Question

我正在使用实时 AJAX 搜索我的网站。

我从ninetofive.me/data/tutorials/live-search/下载了脚本。

当我搜索时，我收到致命错误：Call to a member function fetch_array() on a non-object in E:\xampp\htdocs\test\ajaxsearch\search.php on line 54。

除了更改 MySQL 凭据之外，我没有在演示脚本中进行任何更改。

这是我的 search.php：

<?php
// Credentials
$dbhost = "localhost";
$dbname = "testdb";
$dbuser = "root";
$dbpass = "";

//  Connection
global $tutorial_db;

$tutorial_db = new mysqli();
$tutorial_db->connect($dbhost, $dbuser, $dbpass, $dbname);
$tutorial_db->set_charset("utf8");

//  Check Connection
if ($tutorial_db->connect_errno) {
    printf("Connect failed: %s\n", $tutorial_db->connect_error);
    exit();
    }

/************************************************
    Search Functionality
************************************************/

// Define Output HTML Formating
$html = '';
$html .= '<li class="result">';
$html .= '<a target="_blank" href="urlString">';
$html .= '<h3>nameString</h3>';
$html .= '<h4>functionString</h4>';
$html .= '</a>';
$html .= '</li>';

// Get Search
$search_string = preg_replace("/[^A-Za-z0-9]/", " ", $_POST['query']);
$search_string = $tutorial_db->real_escape_string($search_string);

// Check Length More Than One Character
if (strlen($search_string) >= 1 && $search_string !== ' ') {
    // Build Query
    $query = 'SELECT * FROM search WHERE function LIKE "%'.$search_string.'%" OR name LIKE "%'.$search_string.'%"';

    // Do Search
    $result = $tutorial_db->query($query);
    while($results = $result->fetch_array()) {
        $result_array[] = $results;
    }
// Check If We Have Results
if (isset($result_array)) {
    foreach ($result_array as $result) {
    // Format Output Strings And Hightlight Matches
    $display_function = preg_replace("/".$search_string."/i", "<b class='highlight'>".$search_string."</b>", $result['function']);
    $display_name = preg_replace("/".$search_string."/i", "<b class='highlight'>".$search_string."</b>", $result['name']);
    $display_url = 'http://php.net/manual-lookup.php?pattern='.urlencode($result['function']).'&lang=en';

    // Insert Name
    $output = str_replace('nameString', $display_name, $html);

    // Insert Function
    $output = str_replace('functionString', $display_function, $output);

            // Insert URL
            $output = str_replace('urlString', $display_url, $output);

            // Output
            echo($output);
        }
    }else{

        // Format No Results Output
        $output = str_replace('urlString', 'javascript:void(0);', $html);
        $output = str_replace('nameString', '<b>No Results Found.</b>', $output);
        $output = str_replace('functionString', 'Sorry :(', $output);

        // Output
        echo($output);
    }
}


/*
// Build Function List (Insert All Functions Into DB - From PHP)

// Compile Functions Array
$functions = get_defined_functions();
$functions = $functions['internal'];

// Loop, Format and Insert
foreach ($functions as $function) {
    $function_name = str_replace("_", " ", $function);
    $function_name = ucwords($function_name);

    $query = '';
    $query = 'INSERT INTO search SET id = "", function = "'.$function.'", name = "'.$function_name.'"';

    $tutorial_db->query($query);
}
*/
?>

请帮帮我：

Answer 1

您必须在使用前检查 mysqli->query 方法返回的内容。

如果您的 SQL 查询中有错误，query 方法应该返回 FALSE，在这种情况下，您可以询问 myslqi 的错误是什么错误属性。

你的代码应该是这样的：

$result = $tutorial_db->query($query);
if($result === FALSE) {
    echo $tutorial_db->error;
    // or do whatever you have to do to fix or log the issue.
}
else {
    while($results = $result->fetch_array()) {
        $result_array[] = $results;
    }
}