Menu
How could I check if string has already been encoded?
For example, if I encode TEST==, I get TEST%3D%3D. If I again encode last string, I get TEST%253D%253D, I would have to know before doing that if it is already encoded...
I have encoded parameters saved, and I need to search for them. I don't know for input parameters, what will they be - encoded or not, so I have to know if I have to encode or decode them before search.
462
URL Encoding (Percent Encoding) URL encoding converts characters into a format that can be transmitted over the Internet. URLs can only be sent over the Internet using the ASCII character-set. Since URLs often contain characters outside the ASCII set, the URL has to be converted into a valid ASCII format.
PHP | urlencode() Function. The urlencode() function is an inbuilt function in PHP which is used to encode the url. This function returns a string which consist all non-alphanumeric characters except -_. and replace by the percent (%) sign followed by two hex digits and spaces encoded as plus (+) signs.
URL Encoding (Percent Encoding) A URL is composed from a limited set of characters belonging to the US-ASCII character set. These characters include digits (0-9), letters(A-Z, a-z), and a few special characters ( "-" , "." , "_" , "~" ).
"Browsers" don't do that. It may happen, that web sites or applications encode URLs this way if they are used in URL parameters: http://www.example.net/?url=http%3A%2F%2Fwww.example.com .
Decode, compare to original. If it does differ, original is encoded. If it doesn't differ, original isn't encoded. But still it says nothing about whether the newly decoded version isn't still encoded. A good task for recursion.
I hope one can't write a quine in urlencode, or this algorithm would get stuck.
Exception: When a string contains "+" character url decoder replaces it with a space even though the string is not url encoded
125
Use regexp to check if your string contains illegal characters (i.e. characters which cannot be found in URL-encoded string, like whitespace).
25
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
