Tutorial on how to create a city selector using PHP and Baidu Map API

Using PHP and Baidu Map API to implement a city selector production tutorial

Introduction:
With the rapid development of the Internet, the demand for online shopping, travel, etc. is also increasing. And accurately selecting the target city is very important for many websites and applications. Today we will teach you how to use PHP and Baidu Map API to make a simple and easy-to-use city selector to meet the user's selection needs.

Step one: Apply for a Baidu Map developer account
First, we need to register and create a Baidu Map developer account. Please visit Baidu Map Open Platform (http://lbsyun.baidu.com/) and click the "Register" button in the upper right corner, follow the prompts to complete registration and log in.

Step 2: Create an application
After successful login, click "Console" to enter the application management page, then click "Create Application", fill in the application name and select "Web" as the application type. After filling in, click "Submit".

Step Three: Obtain API Key
After creating the application, you can see "AK (Access Key)" on the "Application Details" page, copy the key as the key in subsequent code value.

Step 4: Introduce the Baidu Map API file
In your PHP file, add the following line of code to the head to introduce the Baidu Map API file:

<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=your_ak"></script>

Put your_ak Replace with your API key.

Step 5: Create a city selector form
In your PHP file, add the following code to create a city selector form:

<form>
    <label for="city">请选择城市：</label>
    <select id="city" name="city">
        <option value="">请选择</option>
    </select>
    <input type="submit" value="确认">
</form>

Step 6: Use Baidu Map API Get city data
At the bottom of the PHP file, add the following JavaScript code to use the Baidu Map API to get the city data and populate it into the city selector form:

<script type="text/javascript">
    var citySelect = document.getElementById("city"); // 获取城市选择器元素

    // 使用百度地图API获取省份数据
    var provinceSelect = new BMapLib.CityPicker.LocalCity();
    provinceSelect.get(function (result) {
        // 遍历省份数据
        for (var i = 0; i < result.s.length; i++) {
            // 创建省份Option选项并添加到城市选择器中
            var option = document.createElement("option");
            option.value = result.s[i].n; // 设置省份名称为Option的值
            option.innerText = result.s[i].n; // 设置省份名称为Option的显示文本
            citySelect.appendChild(option);
        }
    });

    // 当省份选择变化时，根据选择的省份获取相应的城市数据
    citySelect.onchange = function () {
        var provinceName = this.value; // 获取选择的省份名称

        // 使用百度地图API获取城市数据
        var cityData = new BMapLib.CityPicker.LocalCity();
        cityData.get(function (result) {
            // 清空城市选择器中已有的城市选项
            while (citySelect.options.length > 1) {
                citySelect.remove(1);
            }

            // 遍历城市数据
            for (var i = 0; i < result.c.length; i++) {
                // 判断城市的省份是否与选择的省份相同
                if (result.c[i].p == provinceName) {
                    // 创建城市Option选项并添加到城市选择器中
                    var option = document.createElement("option");
                    option.value = result.c[i].n; // 设置城市名称为Option的值
                    option.innerText = result.c[i].n; // 设置城市名称为Option的显示文本
                    citySelect.appendChild(option);
                }
            }
        });
    }
</script>

Step 7: Handle the city selection operation
In your PHP file, use the $_POST variable to handle the form submission event to obtain the city data selected by the user:

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $selectedCity = $_POST["city"]; // 获取用户选择的城市

    // 在这里添加对所选城市的处理代码，如跳转到其他页面、显示相关信息等。

}
?>

At this point, you have successfully completed the production of the city selector. Users can quickly and accurately select target cities by selecting provinces and cities. You can further expand the functions of the city selector according to specific needs, such as adding search functions, linkage selection, etc.

Summary:
Using PHP and Baidu Map API to create a city selector is a relatively simple and practical function. With the above steps, you can easily integrate the city picker in your website or app and improve the user experience. I hope this production tutorial will be helpful to you, and you are welcome to discover and explore more possibilities in practice. I wish you success!

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