Tìm hiểu, cài đặt và sử dụng PHP Code Sniffer

$ phpcs /path/to/code

FILE: /path/to/code/myfile.php
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FOUND 5 ERROR(S) AFFECTING 5 LINE(S)
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  2 | ERROR | Missing file doc comment
 20 | ERROR | PHP keywords must be lowercase; expected "false" but found "FALSE"
 47 | ERROR | Line not indented correctly; expected 4 spaces but found 1
 51 | ERROR | Missing function doc comment
 88 | ERROR | Line not indented correctly; expected 9 spaces but found 6
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FILE: /path/to/code/yourfile.php
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FOUND 1 ERROR(S) AND 1 WARNING(S) AFFECTING 1 LINE(S)
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 21 | ERROR   | PHP keywords must be lowercase; expected "false" but found
    |         | "FALSE"
 21 | WARNING | Equals sign not aligned with surrounding assignments
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