PHP_CodeSniffer is a set of two PHP scripts:
phpcs script that tokenizes PHP, JavaScript and CSS files to detect violations of a defined coding standard; andphpcbf script to automatically correct detected coding standard violations.PHP_CodeSniffer is an essential development tool that ensures your code remains clean and consistent.
A coding standard in PHP_CodeSniffer is a collection of sniff files. Each sniff file checks one part of the coding standard only. Each sniff can yield multiple error codes, a different one for each aspect of the code which was checked and found non-compliant.
Multiple coding standards can be used within PHP_CodeSniffer so that the one installation can be used across multiple projects. The default coding standard used by PHP_CodeSniffer is the PEAR coding standard.
To check a file against the PEAR coding standard, simply specify the file's location.
$ phpcs /path/to/code/myfile.php FILE: /path/to/code/myfile.php -------------------------------------------------------------------------------- FOUND 5 ERROR(S) AFFECTING 2 LINE(S) -------------------------------------------------------------------------------- 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 --------------------------------------------------------------------------------
Or, if you wish to check an entire directory, you can specify the directory location instead of a file.
$ phpcs /path/to/code
FILE: /path/to/code/myfile.php
--------------------------------------------------------------------------------
FOUND 5 ERROR(S) AFFECTING 5 LINE(S)
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
FILE: /path/to/code/yourfile.php
--------------------------------------------------------------------------------
FOUND 1 ERROR(S) AND 1 WARNING(S) AFFECTING 1 LINE(S)
--------------------------------------------------------------------------------
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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