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PHP str_rot13() Function

PHP str_rot13() function is used to perform ROT13 encoding on a given input string. In this encoding it shifts every alphabet present in the input string by 13 places in the alphabet and the numeric and non-alphabetical characters remains same. If we pass the encoded string to this function it will return the decoded string.

Syntax:

  str_rot13( $string );

Parameter Values

Parameter	Description
string	This is a required parameter. This parameter contains the string to be encoded.

Here is an example of str_rot13() function in PHP:

<html>
<body>

<?php
echo str_rot13("PHPTPOINT");
echo "<br>";
echo str_rot13("CUCGCBVAG");
?>

</body>
</html>

Output:
CUCGCBVAG
PHPTPOINT

Here is an example of str_rot13() function in PHP:

<html>
<body>

<?php
$str1 = "Hello Everyone!!!";
$str2 = "This is 2020.";

echo str_rot13($str1);
echo "<br>";
echo str_rot13($str2); // Numeric characters deosn't change
echo "<br>";
echo str_rot13("Uryyb Rirelbar!!!");
echo "<br>";
echo str_rot13("Guvf vf 2020.");
?>

</body>
</html>

Output:
Uryyb Rirelbar!!!
Guvf vf 2020.
Hello Everyone!!!
This is 2020.

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