本篇文章主要介绍php通过正则表达式实现语法高亮，感兴趣的朋友参考下，希望对大家有所帮助。
本文实例讲述了php实现简单的语法高亮函数。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: " . $example;';
// output the formatted code:
print '<pre class="brush:php;toolbar:false">';
print syntax_highlight($example_php_code);
print '';
/*example-end*/总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
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