Question

我有以下正则表达式来匹配><：/(\\\>\\\<)/。但是当我使用那个正则表达式时没有任何反应。

如何匹配><并将其转换为图像？

如果你需要整个功能来看我的样子：

function bbcode($string) {

    # GLOBAL
    global $folder_smileys;

    # VARIABLE
    $hashtag = str_replace('|', '', $string);
    $string = nl2br($string);
    $icon_div_1 = '<div class="icon-inplace" style="background-image: url(';
    $icon_div_2 = ');"></div>';


    # ARRAY
    $codes = Array(
        '/\[b\](.+?)\[\/b\]/' => '<div class="font-bold">\1</div>',
        '/\[i\](.+?)\[\/i\]/' => '<div class="font-italic">\1</div>',
        '/\[s\](.+?)\[\/s\]/' => '<div class="font-strikethrough">\1</div>',
        '/\[url=(.+?)\](.+?)\[\/url\]/' => '<a href="\1" target="_blank">\2</a>',

        '/:\)/' => $icon_div_1 . url($folder_smileys.'smiley-1f642.png') . $icon_div_2,
        '/;\)/' => $icon_div_1 . url($folder_smileys.'smiley-1f609.png') . $icon_div_2,
        '/:\//' => $icon_div_1 . url($folder_smileys.'smiley-1f615.png') . $icon_div_2,
        '/:\(/' => $icon_div_1 . url($folder_smileys.'smiley-1f641.png') . $icon_div_2,
        '/:O/' => $icon_div_1 . url($folder_smileys.'smiley-1f632.png') . $icon_div_2,
        '/:P/' => $icon_div_1 . url($folder_smileys.'smiley-1f61b.png') . $icon_div_2,
        '/-.-/' => $icon_div_1 . url($folder_smileys.'smiley-1f611.png') . $icon_div_2,
        '/\^\^/' => $icon_div_1 . url($folder_smileys.'smiley-1f604.png') . $icon_div_2,
        '/:@/' => $icon_div_1 . url($folder_smileys.'smiley-1f621.png') . $icon_div_2,
        '/<3/' => $icon_div_1 . url($folder_smileys.'symbol-2764.png') . $icon_div_2,
        '/O.o/' => $icon_div_1 . url($folder_smileys.'smiley-1f924.png') . $icon_div_2,
        '/\(Y\)/' => $icon_div_1 . url($folder_smileys.'symbol-1f44d-1f3fb.png') . $icon_div_2,
        '/(\\\>\\\<)/' => $icon_div_1 . url($folder_smileys.'smiley-1f616.png') . $icon_div_2
    );


    # OUTPUT
    return preg_replace(array_keys($codes), array_values($codes), $string);

}


echo bbcode('><');  // Outputs >< and not as an image

Answer 1

更清楚：

function bbcode($string) {

    $smileys = [ ':)' => $icon_div_1 . url($folder_smileys. 'smiley-1f642.png') . $icon_div_2,
                 ';)' => $icon_div_1 . url($folder_smileys. 'smiley-1f649.png') . $icon_div_2,
                 // etc.
               ];

    $result = strtr($string, $smileys);

    $codes = [
        '~\[b](.+?)\[/b]~s' => '<div class="font-bold">\1</div>',
        '~\[i](.+?)\[/i]~s' => '<div class="font-italic">\1</div>',
        '~\[s](.+?)\[/s]~s' => '<div class="font-strikethrough">\1</div>',
        '~\[url=(.+?)](.+?)\[/url]~s' => '<a href="\1" target="_blank">\2</a>',
    ];

    $result = preg_replace(array_keys($codes), $codes, $result);

    return $result;
}

您需要先替换表情符号，否则粗体，斜体和网址代码生成的尖括号可能会被覆盖。

你必须明白，当你给preg_replace（或str_replace一个数组时，行为是相同的），该函数接受第一项，继续替换并产生一个新的字符串，然后下一个项目使用这个新字符串并继续下一个替换。为了说明这种行为，如果你写这样的东西：

$string = 'az';
$rep = [ '~a~' => 'z',
         '~z~' => 'a' ];

echo preg_replace(array_keys($rep), $rep, $string);

您将获得＆＃34; aa＆＃34; （循环替换的原因："az" -> "zz" -> "aa"）。

strtr表现不同，只解析一次字符串（无论替换对的数量是多少）。

$string = 'az';
$rep = [ 'a' => 'z',
         'z' => 'a' ];

echo strtr($string, $rep);

它返回＆＃34; za＆＃34; （一遍）。

转换＆gt;＆lt;对图像的笑脸

1 个答案: