php实现简单的源码语法高亮函数

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',
        '"$1"', $code
    );

    // hightlight functions and other structures like --> function foobar()     $code = preg_replace(
        '/(\s)\b(.*?)((\b|\s)\()/U',
        '$1$2$3',
        $code
    );

    // Match comments (like /* */):
    $code = preg_replace(
        '/(\/\/)(.+)\s/',
        '$0',
        $code
    );

    $code = preg_replace(
        '/(\/\*.*?\*\/)/s',
        '$0',
        $code
    );

    // hightlight braces:
    $code = preg_replace('/(\(|\[|\{|\}|\]|\)|\->)/', '$1', $code);

    // hightlight variables $foobar
    $code = preg_replace(
        '/(\$[a-zA-Z0-9_]+)/', '$1', $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/',
        '$1', $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 '';
print syntax_highlight($example_php_code);
print '';

/*example-end*/

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