這篇文章主要介紹了php實(shí)現(xiàn)簡單的語法高亮函數(shù),實(shí)例分析了php通過正則表達(dá)式實(shí)現(xiàn)語法高亮的相關(guān)技巧,需要的朋友可以參考下
本文實(shí)例講述了php實(shí)現(xiàn)簡單的語法高亮函數(shù)。分享給大家供大家參考。具體分析如下：
這是一個(gè)php實(shí)現(xiàn)的簡單語法高亮顯示的函數(shù)，注意：這個(gè)函數(shù)設(shè)計(jì)的比較簡單，可能對(duì)某些語法不能高亮顯示，你可以自己擴(kuò)充該函數(shù)的功能
function syntax_highlight($code){
// this matches --> "foobar" <--
$code = preg_replace(
'/"(.*?)"/U',
'"<span>$1</span>"', $code
);
// hightlight functions and other structures like --> function foobar() <---
$code = preg_replace(
'/(\s)\b(.*?)((\b|\s)\()/U',
'$1<span>$2</span>$3',
$code
);
// Match comments (like /* */):
$code = preg_replace(
'/(\/\/)(.+)\s/',
'<span><i>$0</i></span>',
$code
);
$code = preg_replace(
'/(\/\*.*?\*\/)/s',
'<span><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>$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>$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*/
希望本文所述對(duì)大家的php程序設(shè)計(jì)有所幫助。