class DeprecatedFunctionsSniff

class DeprecatedFunctionsSniff extends ForbiddenFunctionsSniff {
    
    /**
     * A list of forbidden functions with their alternatives.
     *
     * The value is NULL if no alternative exists. IE, the
     * function should just not be used.
     *
     * @var array<string, string|null>
     */
    public $forbiddenFunctions = [];
    
    /**
     * Constructor.
     *
     * Uses the Reflection API to get a list of deprecated functions.
     */
    public function __construct() {
        $functions = get_defined_functions();
        foreach ($functions['internal'] as $functionName) {
            $function = new ReflectionFunction($functionName);
            if ($function->isDeprecated() === true) {
                $this->forbiddenFunctions[$functionName] = null;
            }
        }
    }
    
    //end __construct()
    
    /**
     * Generates the error or warning for this sniff.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the forbidden function
     *                                               in the token array.
     * @param string                      $function  The name of the forbidden function.
     * @param string                      $pattern   The pattern used for the match.
     *
     * @return void
     */
    protected function addError($phpcsFile, $stackPtr, $function, $pattern = null) {
        $data = [
            $function,
        ];
        $error = 'Function %s() has been deprecated';
        $type = 'Deprecated';
        if ($this->error === true) {
            $phpcsFile->addError($error, $stackPtr, $type, $data);
        }
        else {
            $phpcsFile->addWarning($error, $stackPtr, $type, $data);
        }
    }
    
    //end addError()

}