Here is are some results with XXTEA/PHP:
text: This is an example. !@#$%^&*(){}[]:;
key: 8GmZWww5T97jb39W
encrypt: ZB3oHyOnV+jeZlS4JzQYxwiToxy0NYbcV7YN8wPDHsNLTjxJGPr+5w==
decrypt: This is an example. !@#$%^&*(){}[]:;
Encryption does not match the results for XXTEA/JavaScript:
text: This is an example. !@#$%^&*(){}[]:;
key: 8GmZWww5T97jb39W
encrypt: BPAOskr9QeOE9S2gtKrArurP5RtjM+5GzQF6gLB4BKi+HAJV
decrypt: This is an example. !@#$%^&*(){}[]:;