What is the str_rot13 function in PHP?
In PHP, we can perform an ROT13 transformation of a string using the str_rot13 function.
ROT13 is an algorithm that replaces a letter with the 13th letter after it in the alphabet.
Do not use this as an encryption algorithm.
A visual representation of the ROT13 cipher
Syntax
str_rot13(string $string): string
Parameters
This function requires the string we want to encode as a mandatory parameter.
Return value
The str_rot13function will return the computed ROT13 of the given string.
This function works as both a decoder and an encoder.
This function will only encode the alphabet characters; it leaves all other characters untouched.
Code
In this example, we will encode the string and then decode it back to the original version.
<?php$mystr = "Hello, Educative!";$mystr = str_rot13($mystr);echo "First encode: " . $mystr . "\n"; // note that the "!" is untouched!$mystr = str_rot13($mystr);echo "Second encode: " . $mystr;
Explanation
- In line 2, the input string is declared.
- In line 3, the
str_rot13function is applied to the input string. - In line 4, the encoded string is printed.
- In line 5, the
str_rot13function is applied to the encoded string to be decoded. - In line 6, the original string obtained through decoding the encoded string is printed.
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