PHP

base64_decode

 base64_decode(string $string, bool $strict = false): string|false
 // Example
 // base64_decode('VGhpcyBpcyBhIHN0cmluZw==')
 // Result: This is a string
   
 // For Encoding
 base64_encode(string $string): string
 // base64_encode('This is a string')
 // Result: VGhpcyBpcyBhIHN0cmluZw==