php實現簡單的語法高亮函數

一個php實現的簡單語法高亮顯示的函數，注意：這個函數設計的比較簡單，可能對某些語法不能高亮顯示，你可以自己擴充該函數的功能

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',
    '<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/</pre>