Example (no errors):
https://www.bairesdev.com/tools/phpcodechecker/api.php?code=$hello;
Example (with errors):
https://www.bairesdev.com/tools/phpcodechecker/api.php?code=$hello(;
You can base64_encode() and then urlencode() when using POST, just pass https://www.bairesdev.com/tools/phpcodechecker/api.php?base64 in your request url or body content