举例:后台输入域名:www.onexin.net,前台输出的结果会自动变成http://开头的链接。
email也如此,都被自动识别并添加上了链接。
相关文件:/wp-includes/formatting.php
make_clickable函数
//开启文章识别网址,邮件地址 add_filter( 'the_content', 'make_clickable' );
/** * Callback to convert URI match to HTML A element. * * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link * make_clickable()}. * * @since 2.3.2 * @access private * * @param array $matches Single Regex Match. * @return string HTML A element with URI address. */ function _make_url_clickable_cb($matches) { $url = $matches[2]; $url = esc_url($url); if ( empty($url) ) return $matches[0]; return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>"; } /** * Callback to convert URL match to HTML A element. * * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link * make_clickable()}. * * @since 2.3.2 * @access private * * @param array $matches Single Regex Match. * @return string HTML A element with URL address. */ function _make_web_ftp_clickable_cb($matches) { $ret = ''; $dest = $matches[2]; $dest = 'http://' . $dest; $dest = esc_url($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"; } /** * Callback to convert email address match to HTML A element. * * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link * make_clickable()}. * * @since 2.3.2 * @access private * * @param array $matches Single Regex Match. * @return string HTML A element with email address. */ function _make_email_clickable_cb($matches) { $email = $matches[2] . '@' . $matches[3]; return $matches[1] . "<a href=\"mailto:$email\">$email</a>"; } /** * Convert plaintext URI to HTML links. * * Converts URI, www and ftp, and email addresses. Finishes by fixing links * within links. * * @since 0.71 * * @param string $ret Content to convert URIs. * @return string Content with converted URIs. */ function make_clickable($ret) { $ret = ' ' . $ret; // in testing, using arrays here was found to be faster $ret = preg_replace_callback('#(?<=[\s>])(\()?([\w]+?://(?:[\w\\x80-\\xff\#$%&~/=?@\[\](+-]|[.,;:](?![\s<]|(\))?([\s]|$))|(?(1)\)(?![\s<.,;:]|$)|\)))+)#is', '_make_url_clickable_cb', $ret); $ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret); $ret = preg_replace_callback('#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_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; }