preg_replace_callback要求参数2是有效的回调...坚持!

时间:2011-04-03 14:04:40

标签: php

public function make_url_clickable_cb($matches) {
$ret = '';
$url = $matches[2];

if ( empty($url) )
    return $matches[0];
// removed trailing [.,;:] from URL
if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) {
    $ret = substr($url, -1);
    $url = substr($url, 0, strlen($url)-1);
}
return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">" . $this->truncate($url, 35, '...'). "</a>" . $ret;
}

public function make_web_ftp_clickable_cb($matches) {
    $ret = '';
    $dest = $matches[2];
    $dest = 'http://' . $dest;

    if ( empty($dest) )
        return $matches[0];
    // removed trailing [,;:] from URL
    if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) {
        $ret = substr($dest, -1);
        $dest = substr($dest, 0, strlen($dest)-1);
    }
    return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>" . $ret;
}

public function make_email_clickable_cb($matches) {
    $email = $matches[2] . '@' . $matches[3];
    return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
}
public function make_clickable($ret) {
    $ret = ' ' . $ret;
    // in testing, using arrays here was found to be faster
    $ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', 'Main::make_url_clickable_cb', $ret);
    $ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', 'Main::make_web_ftp_clickable_cb', $ret);
    $ret = preg_replace_callback('#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', 'Main::make_email_clickable_cb', $ret);

    // this one is not in an array because we need it to run last, for cleanup of accidental links within links
    $ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret);
    $ret = trim($ret);
    return $ret;
}

为什么这不起作用? 我收到这些错误:

警告:preg_replace_callback()[function.preg-replace-callback]:要求参数2,'Main :: make_url_clickable_cb'成为第134行的有效回调

警告:preg_replace_callback()[function.preg-replace-callback]:要求参数2,'Main :: make_web_ftp_clickable_cb'成为第135行的有效回调

警告:preg_replace_callback()[function.preg-replace-callback]:要求参数2,'Main :: make_email_clickable_cb'成为第136行的有效回调

4 个答案:

答案 0 :(得分:11)

如果您将单个字符串作为回调传递,PHP会将其解释为函数的名称 - 而Main::make_web_ftp_clickable_cb不是有效的函数名称;


如果要将静态类方法指定为回调,则必须使用:

array('Main', 'make_web_ftp_clickable_cb')

并且,如果要指定对象的方法,类的实例,则必须使用:

array($object, 'make_web_ftp_clickable_cb')


以下是手册的相关部分:Pseudo-types and variables used in this documentation - callback

答案 1 :(得分:2)

您需要将函数指定为静态函数,并使用以下函数作为回调函数:

array(get_class($this), 'make_url_clickable_cb')

array(get_class($this), 'make_web_ftp_clickable_cb')

array(get_class($this), 'make_email_clickable_cb')

或(如果从其他人那里打电话):

array('class_name', 'make_url_clickable_cb')

array('class_name', 'make_web_ftp_clickable_cb')

array('class_name', 'make_email_clickable_cb')

答案 2 :(得分:0)

您收到这些错误,因为Main::make_url_clickable_cbMain::make_web_ftp_clickable_cbMain::make_email_clickable_cb不是preg_replace_callback的有效回调。

提示:在指定回调时忽略Main::部分。

答案 3 :(得分:-3)

我找到了我的解决方案: preg_replace_callback