php实现简单的语法高亮函数实例分析
本文实例讲述了php实现简单的语法高亮函数，分享给大家供大家参考，具体分析如下：
这是一个php实现的简单语法高亮显示的函数，注意：这个函数设计的比较简单，可能对某些语法不能高亮显示，你可以自己扩充该函数的功能
- function syntax_highlight($code){
- // this matches --> "foobar" <--
- $code = preg_replace(
- '/"(.*?)"/U',
- '"<span >$1</span>"', $code
- );
- // hightlight functions and other structures like --> function foobar() <---
- $code = preg_replace(
- '/(\s)\b(.*?)((\b|\s)\()/U',
- '$1<span >$2</span>$3',
- $code
- );
- // Match comments (like /* */):
- $code = preg_replace(
- '/(\/\/)(.+)\s/',
- '<span ><i>$0</i></span>',
- $code
- );
- $code = preg_replace(
- '/(\/\*.*?\*\/)/s',
- '<span ><i>$0</i></span>',
- $code
- );
- // hightlight braces:
- $code = preg_replace('/(\(|\[|\{|\}|\]|\)|\->)/', '<strong>$1</strong>', $code);
- // hightlight variables $foobar
- $code = preg_replace(
- '/(\$[a-zA-Z0-9_]+)/', '<span >$1</span>', $code
- );
- /* The \b in the pattern indicates a word boundary, so only the distinct
- ** word "web" is matched, and not a word partial like "webbing" or "cobweb"
- */
- // special words and functions
- $code = preg_replace(
- '/\b(print|echo|new|function)\b/',
- '<span >$1</span>', $code
- );
- return $code;
- }
- /*example-start*/
- /*
- ** Create some example PHP code:
- */
- $example_php_code = '
- // some code comment:
- $example = "foobar";
- print $_SERVER["REMOTE_ADDR"];
- $array = array(1, 2, 3, 4, 5);
- function example_function($str) {
- // reverse string
- echo strrev($obj);
- }
- print example_function("foo");
- /*
- ** A multiple line comment
- */
- print "Something: " . $example;';
- // output the formatted code:
- print '<pre>';
- print syntax_highlight($example_php_code);
- print '</pre>';
- /*example-end*/