php实现简单的语法高亮函数实例分析

 function syntax_highlight($code){ // this matches --> "foobar" <-- $code = preg_replace( '/"(.*?)"/U', '"<span style="color: #007F00">$1</span>"', $code ); // hightlight functions and other structures like --> function foobar() <--- $code = preg_replace( '/(\s)\b(.*?)((\b|\s)\()/U', '$1<span style="color: #0000ff">$2</span>$3', $code ); // Match comments (like /* */): $code = preg_replace( '/(\/\/)(.+)\s/', '<span style="color: #660066;background-color: #FFFCB1"><i>$0</i></span>', $code ); $code = preg_replace( '/(\/\*.*?\*\/)/<p style="color:transparent">来源gao!%daima.com搞$代*!码网</p>s', '<span style="color: #660066;background-color: #FFFCB1"><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 style="color: #0000B3">$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 style="color: #7F007F">$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: " . $example;'; // output the formatted code: print '<pre class="prettyprint linenums">'; print syntax_highlight($example_php_code); print '

‘; /*example-end*/