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', 

  '&quot;<span style="color: #007F00">$1</span>&quot;', $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(

  '/(\/\*.*?\*\/)/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>';

print syntax_highlight($example_php_code);

print '</pre>';

/*example-end*/



希望本文所述对大家的php程序设计有所帮助。