97 lines
2.8 KiB
Markdown
97 lines
2.8 KiB
Markdown
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[](https://travis-ci.org/leafo/lessphp)
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# lessphp v0.5.0
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### <http://leafo.net/lessphp>
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`lessphp` is a compiler for LESS written in PHP. The documentation is great,
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so check it out: <http://leafo.net/lessphp/docs/>.
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Here's a quick tutorial:
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### How to use in your PHP project
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The only file required is `lessc.inc.php`, so copy that to your include directory.
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The typical flow of **lessphp** is to create a new instance of `lessc`,
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configure it how you like, then tell it to compile something using one built in
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compile methods.
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The `compile` method compiles a string of LESS code to CSS.
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```php
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<?php
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require "lessc.inc.php";
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$less = new lessc;
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echo $less->compile(".block { padding: 3 + 4px }");
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```
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The `compileFile` method reads and compiles a file. It will either return the
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result or write it to the path specified by an optional second argument.
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```php
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<?php
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echo $less->compileFile("input.less");
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```
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The `compileChecked` method is like `compileFile`, but it only compiles if the output
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file doesn't exist or it's older than the input file:
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```php
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<?php
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$less->checkedCompile("input.less", "output.css");
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```
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If there any problem compiling your code, an exception is thrown with a helpful message:
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```php
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<?php
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try {
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$less->compile("invalid LESS } {");
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} catch (exception $e) {
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echo "fatal error: " . $e->getMessage();
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}
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```
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The `lessc` object can be configured through an assortment of instance methods.
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Some possible configuration options include [changing the output format][1],
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[setting variables from PHP][2], and [controlling the preservation of
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comments][3], writing [custom functions][4] and much more. It's all described
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in [the documentation][0].
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[0]: http://leafo.net/lessphp/docs/
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[1]: http://leafo.net/lessphp/docs/#output_formatting
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[2]: http://leafo.net/lessphp/docs/#setting_variables_from_php
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[3]: http://leafo.net/lessphp/docs/#preserving_comments
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[4]: http://leafo.net/lessphp/docs/#custom_functions
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### How to use from the command line
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An additional script has been included to use the compiler from the command
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line. In the simplest invocation, you specify an input file and the compiled
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css is written to standard out:
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$ plessc input.less > output.css
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Using the -r flag, you can specify LESS code directly as an argument or, if
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the argument is left off, from standard in:
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$ plessc -r "my less code here"
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Finally, by using the -w flag you can watch a specified input file and have it
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compile as needed to the output file:
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$ plessc -w input-file output-file
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Errors from watch mode are written to standard out.
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The -f flag sets the [output formatter][1]. For example, to compress the
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output run this:
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$ plessc -f=compressed myfile.less
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For more help, run `plessc --help`
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