php实现简单的语法高亮函数实例分析

前端技术 2023/09/01 PHP

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。

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