测试字符串是否用PHP进行URL编码 [英] Test if string is URL encoded in PHP

问题描述

如何测试字符串是否经过URL编码?

How can I test if a string is URL encoded?

以下哪种方法更好?

• 在字符串中搜索将要编码的字符，否则将不进行编码，或者
• 使用我做的类似的东西

function is_urlEncoded($string){
 $test_string = $string;
 while(urldecode($test_string) != $test_string){
  $test_string = urldecode($test_string);
 }
 return (urlencode($test_string) == $string)?True:False; 
}

$t = "Hello World > how are you?";
if(is_urlEncoded($sreq)){
 print "Was Encoded.\n";
}else{
 print "Not Encoded.\n";
 print "Should be ".urlencode($sreq)."\n";
}

上面的代码有效，但在字符串经过双重编码的情况下无效，如以下示例所示:

The above code works, but not in instances where the string has been doubly encoded, as in these examples:

• $t = "Hello%2BWorld%2B%253E%2Bhow%2Bare%2Byou%253F";
• $t = "Hello+World%2B%253E%2Bhow%2Bare%2Byou%253F";

• $t = "Hello%2BWorld%2B%253E%2Bhow%2Bare%2Byou%253F";
• $t = "Hello+World%2B%253E%2Bhow%2Bare%2Byou%253F";

推荐答案

您将永远无法确定字符串是否经过URL编码，或者是否应该包含序列%2B.相反，它可能取决于字符串的来源，即它是手工制作的还是来自某些应用程序.

You'll never know for sure if a string is URL-encoded or if it was supposed to have the sequence %2B in it. Instead, it probably depends on where the string came from, i.e. if it was hand-crafted or from some application.

最好在字符串中搜索将要编码的字符，否则将不进行编码，如果存在则表示未编码.

Is it better to search the string for characters which would be encoded, which aren't, and if any exist then its not encoded.

我认为这是一种更好的方法，因为它将处理以编程方式完成的事情(假设应用程序不会留下未编码的字符).

I think this is a better approach, since it would take care of things that have been done programmatically (assuming the application would not have left a non-encoded character behind).

在这里会令人困惑的一件事...从技术上讲，如果%应该"被编码在最终值中，则它应该被编码，因为它是一个特殊字符.您可能必须结合使用多种方法来查找应编码的字符，并验证是否在没有找到字符串的情况下成功解码了该字符串.

One thing that will be confusing here... Technically, the % "should be" encoded if it will be present in the final value, since it is a special character. You might have to combine your approaches to look for should-be-encoded characters as well as validating that the string decodes successfully if none are found.

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