Second-hand recycling website developed using PHP supports geographical location filtering

The second-hand recycling website developed using PHP supports geographical location screening

With the continuous development of society, people's awareness of environmental protection and sustainable development has gradually increased. Second-hand recycling has become an important way of life. By reusing unused items, it not only reduces resource waste, but also contributes to the environment. In order to better meet the needs of users, we developed a second-hand recycling website using PHP and added a geographical location filtering function to it.

When developing a second-hand recycling website, we need to first collect the user's geographical location information. You can use H5's Geolocation API to obtain the user's latitude and longitude information, or obtain the user's city through IP address positioning. These geographical location information are then stored in the database for subsequent filtering operations.

The following is a sample code for obtaining the user's geographical location information:

// 获取用户的地理位置信息
function getLocation() {
    // 获取用户的经纬度
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(showPosition);
    } else {
        alert("该浏览器不支持地理位置获取功能");
    }
}

// 显示用户的地理位置信息
function showPosition(position) {
    var latitude = position.coords.latitude;
    var longitude = position.coords.longitude;
    
    // 将经纬度发送给后端，存储到数据库中
    var url = "save_location.php";
    var params = "latitude=" + latitude + "&longitude=" + longitude;
    
    var xhr = new XMLHttpRequest();
    xhr.open("POST", url, true);
    xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4 && xhr.status == 200) {
            alert(xhr.responseText);
        }
    };
    xhr.send(params);
}

Next, we need to add a geographical location filtering function to the search page of the second-hand recycling website. Users can enter keywords in the search bar and select a nearby geographical location, and the system will filter out qualified second-hand items based on the geographical location selected by the user. The following is an example search page code:

<form action="search_result.php" method="get">
    <input type="text" name="keywords" placeholder="请输入关键词">
    <select name="location">
        <option value="all">全部</option>
        <option value="nearby">附近的物品</option>
        <option value="beijing">北京</option>
        <option value="shanghai">上海</option>
        <option value="guangzhou">广州</option>
    </select>
    <input type="submit" value="搜索">
</form>

In the search results page, we need to query the database to obtain qualified second-hand item information based on the geographical location selected by the user. The following is an example search results page code:

<?php
// 获取用户选择的地理位置
$location = $_GET['location'];

// 根据地理位置筛选二手物品
if ($location == 'nearby') {
    // 根据用户的地理位置，计算附近的物品
} else {
    // 根据用户选择的城市，筛选物品
}

// 显示搜索结果
while ($row = $result->fetch_assoc()) {
    echo $row['item_name'] . "<br>";
    echo $row['item_price'] . "<br>";
    // 显示其他物品信息
}
?>

Through the above development steps, we successfully implemented a second-hand recycling website developed using PHP, and also supported the geographical location filtering function. Users can find nearby second-hand items for recycling based on their geographical location, thereby achieving environmental protection. The implementation of this function not only improves the user experience, but also promotes the development and promotion of second-hand recycling. I hope this example will be helpful to the development of second-hand recycling websites.

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