Original author(s) | Stephen C. Johnson |
---|---|
Developer(s) | AT&T Bell Laboratories |
Initial release | July 26, 1978; 42 years ago[1] |
Written in | C |
Operating system | Cross-platform |
Available in | English |
Type | Static program analysis tools |
License | Originally proprietarycommercial software, now free software under a BSD-like license[2][3] |
lint, or a linter, is a static code analysis tool used to flag programming errors, bugs, stylistic errors and suspicious constructs.[4] The term originates from a Unixutility that examined C language source code.[1]
The default file extension for PHP files is '.php '. A PHP file normally contains HTML tags, and some PHP scripting code. Below, we have an example of a simple PHP file, with a PHP script that uses a built-in PHP function ' echo ' to output the text 'Hello World!' Syntax Constants can be defined using the const keyword, or by using the define -function. While define allows a constant to be defined to an arbitrary expression, the const keyword has restrictions as outlined in the next paragraph. Once a constant is defined, it can never be changed or undefined.
A PHP script or code starts with The default file extension for PHP files is “.php”. For example: file1.php A PHP file normally contains some PHP statements, variables, functions and some HTML tags as well. The PHP language syntax is similar to the syntax of C, so if you have experience with C, you’ll be comfortable with PHP. PHP is actually simpler than C because it doesn’t include some of the more difficult concepts of C — concepts not required to program websites.
History[edit]
Phplint - Node wrapper around the native php linter that allows for parallel linting and integration with build systems like Grunt, Gulp and more. PHP Mess Detector - PHPMD can be seen as a user friendly and easy to configure frontend for the raw metrics measured by PHP Depend. My CI server runs PHP CS Fixer, linked to by another comment, and I regularly run PHPMD to help clean up things, but I'm not anal about that. Once a month or so, I check out the awesome-php repo, which contains a section called 'Code Analysis' (linked above). This is a gold-mine for awesome PHP.
Stephen C. Johnson, a computer scientist at Bell Labs, came up with lint in 1978 while debugging the yacc grammar he was writing for C and dealing with portability issues stemming from porting Unix to a 32-bit machine.[5][1] The term 'lint' was derived from the name of the tiny bits of fiber and fluff shed by clothing, as the command should act like a dryer machine lint trap, detecting small errors with big effects. In 1979, lint was used outside of Bell Labs for the first time in the seventh version (V7) of the Unix operating system.
Over the years, different versions of lint were developed for many C and C++compilers and while modern-day compilers have lint-like functions, lint-like tools have also advanced their capabilities. For example, Gimpel's PC-Lint, used to analyze C++ source code, is still being sold even though it was introduced in 1985.[5]
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This question is crucial. Php lint (php -l file) fails to provide the other half: run the autoload, make sure a function called exists, that variables exists, object properties exist. – Max Nov 7 '14 at 18:03. 6 @IraBaxter useful, but not, strictly speaking, on topic. PHP Code Checker This free service performs a line-by-line analysis for common mistakes and errors in your PHP syntax and will not execute or save your code. PHPLint is a program to validate PHP 5 (targeting 5.6) and PHP 7 (targeting 7.4) source programs written in PHP itself. The result of this validation is a detailed report and possibly a generated documentation about the parsed sources. PHPLint turns a loosely-typed language as PHP into a strongly-typed language.
Overview[edit]
The analysis performed by lint-like tools can also be performed by an optimizing compiler, which aims to generate faster code. In his original 1978 paper, Johnson addressed this issue, concluding that 'the general notion of having two programs is a good one' because they concentrated on different things, thereby allowing the programmer to 'concentrate at one stage of the programming process solely on the algorithms, data structures, and correctness of the program, and then later retrofit, with the aid of lint, the desirable properties of universality and portability'.[1]
Even though modern compilers have evolved to include many of lint's historical functions, lint-like tools have also evolved to detect an even wider variety of suspicious constructs. These include 'warnings about syntax errors, uses of undeclared variables, calls to deprecated functions, spacing and formatting conventions, misuse of scope, implicit fallthrough in switch statements, missing license headers, [and]..dangerous language features'.[6] Dolphin.
Lint-like tools are especially useful for dynamically typed languages like JavaScript and Python. Because the compilers of such languages typically do not enforce as many and as strict rules prior to execution, linter tools can also be used as simple debuggers for finding common errors (e.g. syntactic discrepancies) as well as hard-to-find errors such as heisenbugs (drawing attention to suspicious code as 'possible errors').[7] Lint-like tools generally perform static analysis of source code.[8]
Lint-like tools have also been developed for other aspects of language, including grammar and style guides.[citation needed]
Specialization[edit]
Fortran[edit]
Fortran compilers using space-squeezing techniques (e.g. IBM 1130)[9] made it impossible for the compiler to see the problem with lines like:
Php Syntax Checker
- .. DO 120 J=1.256 .. 120 CONTINUE
- which is why programs like Lint for Fortran[10] can be helpful.[11][12]
See also[edit]
References[edit]
Php Linter Atom
- ^ abcdJohnson, Stephen C. (25 October 1978). 'Lint, a C Program Checker': 78–1273. CiteSeerX10.1.1.56.1841.Cite journal requires
|journal=
(help) - ^'UNIX is free!'. lemis.com. 2002-01-24.
- ^Broderick, Bill (January 23, 2002). 'Dear Unix enthusiasts'(PDF). Caldera International. Archived from the original(PDF) on February 19, 2009.
- ^'About SublimeLinter'. The SublimeLinter Community, revision 1cecc79c. Retrieved 2020-03-29.
- ^ abMorris, Richard (1 October 2009). 'Stephen Curtis Johnson: Geek of the Week'. Red Gate Software. Retrieved 19 January 2018.
- ^'Arcanist User Guide: Lint'. Phabricator. Retrieved 19 January 2018.
- ^'ESLint - Customizable JavaScript linting tool (1)'. theCodeCampus. 2015-06-09. Retrieved 2019-04-21.
- ^Jones, Nigel (1 May 2002). 'How to Use Lint for Static Code Analysis'. Barr Group.
- ^Software: reads the source statements into memory, discards comment lines, removes spaces except in text literals, concatenates continuation lines
- ^Lint for Fortran: Denis W. Haskin (May 2, 1988). 'Shaking down your FORTRAN programs'. Digital Review. pp. 41–47.
similar to DEC's Source Code Analyzer, . comes into play much earlier . before users compile their programs
- ^'COMP-FORTRAN-90 Archives'.
Fortran90-lint, for Fortran 90 program analysis, also other tools, from http://www.cleanscape.net/stdprod/ftp/ftpflint.html
- ^'Chapter 2. Basic Debugger Usage'.
There is a public domain version of lint for FORTRAN 77 called ftnchek
Further reading[edit]
- Darwin, Ian F. (1991). Checking C Programs with Lint: C Programming Utility (Revised ed.). United States: O'Reilly Media. ISBN978-0937175309.
- 'LINT(1)'. FreeBSD General Commands Manual (FreeBSD 11.2). 2015-03-23.
Php Linter Vim
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