How to convert js array to php array

In web development, since JavaScript (JS) and PHP are the two most commonly used programming languages, arrays are inevitable in the development process. In response to this situation, many times we need to convert JS arrays into PHP arrays. There are many ways to achieve this function, which will be introduced one by one below.

Method 1: Use AJAX requests

In the front-end and back-end separation development mode, front-end and back-end applications usually use AJAX requests to communicate. Therefore, we can use AJAX requests to send the JS array to the background. After receiving it, the background can process it accordingly and convert the JS array into a PHP array.

The JS code is as follows:

// 定义JS数组
var jsArr = ['apple', 'banana', 'orange'];
// 新建AJAX请求
var xhr = new XMLHttpRequest();
// 设置请求的方式、发送目标页面和是否异步请求
xhr.open('POST', '处理JS数组的PHP页面地址', true);
// 设置请求头
xhr.setRequestHeader('Content-Type', 'application/json');
// 发送请求
xhr.send(JSON.stringify(jsArr));
// 监听请求
xhr.onreadystatechange = function(){
    // 当请求处理完成后进行操作
    if (xhr.readyState == 4 && xhr.status == 200) {
        // 获取后台返回的结果
        var phpArr = JSON.parse(xhr.responseText);
        console.log(phpArr);
    }
}

The PHP code is as follows:

<?php
// 获取JS数组
$jsArr = json_decode(file_get_contents(&#39;php://input&#39;), true);
// 进行相应的处理
// ......
// 将JS数组转为PHP数组
$phpArr = array();
foreach ($jsArr as $value) {
    $phpArr[] = $value;
}
// 返回结果
echo json_encode($phpArr);
?>

Although this method is relatively simple to implement, if the data volume is large, When requested, the server may be overburdened and have slower response times.

Method 2: Use hidden form to pass

Another method is to use HTML form to pass JS array. The specific method is to convert the JS array into JSON format, and then transfer it in a hidden HTML form. After receiving the JSON data in the background, the JSON is converted into a PHP array.

The JS code is as follows:

// 定义JS数组
var jsArr = ['apple', 'banana', 'orange'];
// 获取存储JS数组的隐藏表单元素对象
var jsonInput = document.getElementById('json_input');
// 转为JSON格式
var jsonString = JSON.stringify(jsArr);
// 将JSON字符串存储到隐藏表单中
jsonInput.value = jsonString;
// 提交表单
document.getElementById('submit_form').submit();

The PHP code is as follows:

<?php
// 获取隐藏表单传递过来的JSON字符串
$jsArrJson = $_POST[&#39;json_input&#39;];
// 将JSON字符串转为PHP数组
$phpArr = json_decode($jsArrJson, true);
// 进行相应的处理
// ......
?>

This method is easy to use, but when the amount of data is large, it may cause some problems to the server. pressure.

Method 3: Use the jQuery library to make AJAX requests

If you use the jQuery library in your project, then using the jQuery library to convert a JS array into a PHP array will Very simple.

The JS code is as follows:

// 定义JS数组
var jsArr = ['apple', 'banana', 'orange'];
// 新建AJAX请求
$.ajax({
    type: "POST",
    url: "处理JS数组的PHP页面地址",
    data: { jsArr: jsArr },
    success: function(phpArr) {
        console.log(phpArr);
    }
});

The PHP code is as follows:

<?php
// 获取JS数组
$jsArr = $_POST[&#39;jsArr&#39;];
// 进行相应的处理
// ......
// 将JS数组转为PHP数组
$phpArr = array();
foreach ($jsArr as $value) {
    $phpArr[] = $value;
}
// 返回结果
echo json_encode($phpArr);
?>

This method is simple and convenient to use, and it can also support more AJAX using the jQuery library Functions, such as using formData to upload files, but it should be noted that using the jQuery library may have some impact on performance and will be relatively slower.

Method 4: Use the eval function in PHP for conversion

There is an Eval function in PHP, which can execute a string as PHP code. Therefore, we can use this function to execute the contents of the $js array as original PHP code and convert the JS array into a PHP array.

The JS code is as follows:

// 定义JS数组
var jsArr = ['apple', 'banana', 'orange'];
// 将JS数组转为JSON字符串
var jsonString = JSON.stringify(jsArr);
// 拼接执行JS代码的字符串
var evalString = "return " + jsonString + ";";
// 在PHP页面中执行JS代码
$.ajax({
    url: "处理JS数组的PHP页面地址?eval=" + encodeURIComponent(evalString),
    success: function(phpArr) {
        console.log(phpArr);
    }
});

The PHP code is as follows:

<?php
// 获取JS数组
$jsArr = eval($_REQUEST[&#39;eval&#39;]);
// 将JS数组转为PHP数组
$phpArr = array();
foreach ($jsArr as $value) {
    $phpArr[] = $value;
}
// 返回结果
echo json_encode($phpArr);
?>

Although this method writes very little code, it uses the Eval function to execute the JS code The method has certain risks. If the string entered in the eval function is not controlled, it may cause security risks.

Summary

According to different needs and development environments, four methods of converting JS arrays to PHP arrays are introduced above. Each method has its own advantages and disadvantages, as shown below:

• Use AJAX request: the execution efficiency is relatively low, the load on the server is high, and the total data size should not be too large.
• Use hidden forms for transmission: The implementation is relatively simple, but the total data size should not be too large, which may put greater pressure on the server.
• Use the jQuery library for AJAX requests: the implementation is simple and convenient, but the performance is relatively low.
• Use the eval function in PHP for conversion: less code is written, but using the eval function requires strict verification of input data to prevent security issues.

Therefore, in actual development, it is necessary to choose the appropriate method according to specific needs.

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