php实现简单的源码语法高亮函数

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function syntax_highlight($code){
 
    // this matches --> "foobar" <--
    $code = preg_replace(
        '/"(.*?)"/U','&quot;<span style="color: #007F00">$1</span>&quot;',$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
    );
 
    $code = preg_replace(
        '/(/*.*?*/)/s',$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*/

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