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php实现简单的语法高亮函数实例分析

　　本文标签：php,语法高亮函数

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 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(
  /(\/\*.*?\*\/)/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 。