Warnings on unrecognized characters

Created by: tdebatty

PHP Warning:  Unexpected character in input:  ' in phar:///root/webshell-detector.phar/src/ObfuscationAnalyzer.php on line 90
PHP Warning:  Unexpected character in input:  '' (ASCII=22) state=0 in phar:///root/webshell-detector.phar/src/ObfuscationAnalyzer.php on line 90
PHP Warning:  Unexpected character in input:  '' (ASCII=6) state=0 in phar:///root/webshell-detector.phar/src/ObfuscationAnalyzer.php on line 90
PHP Warning:  Unexpected character in input:  '' (ASCII=18) state=0 in phar:///root/webshell-detector.phar/src/ObfuscationAnalyzer.php on line 90
PHP Warning:  Unexpected character in input:  '' (ASCII=1) state=0 in phar:///root/webshell-detector.phar/src/ObfuscationAnalyzer.php on line 90
PHP Warning:  Unexpected character in input:  ' in phar:///root/webshell-detector.phar/src/ObfuscationAnalyzer.php on line 90