How to transcode alert pop-up windows in PHP

When writing web applications using PHP, you often need to deal with alert pop-ups in the front-end JavaScript code. However, when using non-ASCII characters such as Chinese in the alert pop-up window, garbled characters may occur because the alert uses ASCII encoding by default. This article will introduce how to transcode the alert pop-up window in PHP and solve the problem of Chinese garbled characters.

1. Use JavaScript functions escape and unescape for transcoding

The JavaScript functions escape and unescape are used to encode and decode non-ASCII characters in strings respectively. Therefore, the string in the alert pop-up window can be encoded using the escape function in PHP, and the unescape function can be used in the front-end JavaScript code to decode, thereby solving the problem of Chinese garbled characters.

The specific code is as follows:

PHP code:

$msg = "你好，世界！";
$escaped_msg = escape($msg);
echo "<script>alert(unescape('" . $escaped_msg . "'));</script>";

JavaScript code:

function escape(str) {
  var res = '';
  for (var i = 0; i < str.length; i++) {
    if (str.charAt(i) === &#39;@&#39;) {
      res += &#39;@@&#39;;
    } else if (escape(str.charAt(i)).length > 1) {
      res += '@' + escape(str.charAt(i)).substring(1);
    } else {
      res += str.charAt(i);
    }
  }
  return res;
}

function unescape(str) {
  var res = '';
  for (var i = 0; i < str.length;) {
    if (str.charAt(i) === '@') {
      if (str.charAt(i + 1) === '@') {
        res += '@';
        i += 2;
      } else {
        res += unescape('%' + str.substring(i + 1, i + 3));
        i += 3;
      }
    } else {
      res += str.charAt(i);
      i++;
    }
  }
  return res;
}

2. Use JavaScript functions encodeURIComponent and decodeURIComponent for transcoding

The JavaScript functions encodeURIComponent and decodeURIComponent are used to encode and decode Chinese characters in the URL respectively. Therefore, you can also use the encodeURIComponent function to encode the string in the alert pop-up window in PHP, and use the decodeURIComponent function to decode it in the front-end JavaScript code to solve the problem of Chinese garbled characters.

The specific code is as follows:

PHP code:

$msg = "你好，世界！";
$encoded_msg = rawurlencode($msg);
echo "<script>alert(decodeURIComponent('" . $encoded_msg . "'));</script>";

JavaScript code:

function decodeURIComponent(str) {
  var res = '';
  try {
    res = decodeURIComponent(str);
  } catch (e) {
    res = str;
  }
  return res;
}

Summary

This article introduces two types of code in PHP The methods to implement alert transcoding are to use the JavaScript functions escape and unescape, and the JavaScript functions encodeURIComponent and decodeURIComponent. Both of these methods can solve the garbled problem when non-ASCII characters such as Chinese are used in the alert pop-up window. It should be noted that code compatibility and security need to be paid attention to when using these methods.

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