php实现简单的语法高亮函数实例分析

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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*/