PHP链接在内容中的链接
我一直在做一个小项目，我发现自己需要一个PHP函数，可以链接我的数据中的URL，同时使我能够设置一些例外的链接，我不想链接。 任何想法如何做到这一点？
我有一个GitHub上的开源项目： LinkifyURL ，你可能要考虑。 它有一个函数： linkify() ，它从文本中linkify() URL并将其转换为链接。 请注意，这不是一个正确的工作！ （请参阅： URL的问题 – 请务必阅读评论的主题以掌握所有可能出错的内容。）
如果你确实需要不链接特定的域名（例如，vimeo和youtube），这里是一个修改的PHP函数linkify_filtered （以工作testing脚本的forms），它linkify_filtered你的需求：
<?php // test.php 20110313_1200 function linkify_filtered($text) { $url_pattern = '/# Rev:20100913_0900 github.com\/jmrware\/LinkifyURL # Match http & ftp URL that is not already linkified. # Alternative 1: URL delimited by (parentheses). (\() # $1 "(" start delimiter. ((?:ht|f)tps?:\/\/[a-z0-9\-._~!$&\'()*+,;=:\/?#[\]@%]+) # $2: URL. (\)) # $3: ")" end delimiter. | # Alternative 2: URL delimited by [square brackets]. (\[) # $4: "[" start delimiter. ((?:ht|f)tps?:\/\/[a-z0-9\-._~!$&\'()*+,;=:\/?#[\]@%]+) # $5: URL. (\]) # $6: "]" end delimiter. | # Alternative 3: URL delimited by {curly braces}. (\{) # $7: "{" start delimiter. ((?:ht|f)tps?:\/\/[a-z0-9\-._~!$&\'()*+,;=:\/?#[\]@%]+) # $8: URL. (\}) # $9: "}" end delimiter. | # Alternative 4: URL delimited by <angle brackets>. (<|&(?:lt|\#60|\#x3c);) # $10: "<" start delimiter (or HTML entity). ((?:ht|f)tps?:\/\/[a-z0-9\-._~!$&\'()*+,;=:\/?#[\]@%]+) # $11: URL. (>|&(?:gt|\#62|\#x3e);) # $12: ">" end delimiter (or HTML entity). | # Alternative 5: URL not delimited by (), [], {} or <>. ( # $13: Prefix proving URL not already linked. (?: ^ # Can be a beginning of line or string, or | [^=\s\'"\]] # a non-"=", non-quote, non-"]", followed by ) \s*[\'"]? # optional whitespace and optional quote; | [^=\s]\s+ # or... a non-equals sign followed by whitespace. ) # End $13. Non-prelinkified-proof prefix. ( \b # $14: Other non-delimited URL. (?:ht|f)tps?:\/\/ # Required literal http, https, ftp or ftps prefix. [a-z0-9\-._~!$\'()*+,;=:\/?#[\]@%]+ # All URI chars except "&" (normal*). (?: # Either on a "&" or at the end of URI. (?! # Allow a "&" char only if not start of an... &(?:gt|\#0*62|\#x0*3e); # HTML ">" entity, or | &(?:amp|apos|quot|\#0*3[49]|\#x0*2[27]); # a [&\'"] entity if [.!&\',:?;]? # followed by optional punctuation then (?:[^a-z0-9\-._~!$&\'()*+,;=:\/?#[\]@%]|$) # a non-URI char or EOS. ) & # If neg-assertion true, match "&" (special). [a-z0-9\-._~!$\'()*+,;=:\/?#[\]@%]* # More non-& URI chars (normal*). )* # Unroll-the-loop (special normal*)*. [a-z0-9\-_~$()*+=\/#[\]@%] # Last char can\'t be [.!&\',;:?] ) # End $14. Other non-delimited URL. /imx'; // $url_replace = '$1$4$7$10$13<a href="$2$5$8$11$14">$2$5$8$11$14</a>$3$6$9$12'; // return preg_replace($url_pattern, $url_replace, $text); $url_replace = '_linkify_filter_callback'; return preg_replace_callback($url_pattern, $url_replace, $text); } function _linkify_filter_callback($m) { // Filter out youtube and vimeo domains. $pre = $m[1].$m[4].$m[7].$m[10].$m[13]; $url = $m[2].$m[5].$m[8].$m[11].$m[14]; $post = $m[3].$m[6].$m[9].$m[12]; if (preg_match('/\b(?:youtube|vimeo)\.com\b/', $url)) { return $pre . $url . $post; } // else linkify... return $pre .'<a href="'. $url .'">' . $url .'</a>' .$post; } // Create some test data. $data = 'Plain URLs (not delimited): foo http://example.com bar... foo http://example.com:80 bar... foo http://example.com:80/path/ bar... foo http://example.com:80/path/file.txt bar... foo http://example.com:80/path/file.txt?query=val&var2=val2 bar... foo http://example.com:80/path/file.txt?query=val&var2=val2#fragment bar... foo http://example.com/(file\'s_name.txt) bar... (with \' and (parentheses)) foo http://[2001:0db8:85a3:08d3:1319:8a2e:0370:7348] bar... ([IPv6 literal]) foo http://[2001:0db8:85a3:08d3:1319:8a2e:0370:7348]/file.txt bar... ([IPv6] with path) foo http://youtube.com bar... foo http://youtube.com:80 bar... foo http://youtube.com:80/path/ bar... foo http://youtube.com:80/path/file.txt bar... foo http://youtube.com:80/path/file.txt?query=val&var2=val2 bar... foo http://youtube.com:80/path/file.txt?query=val&var2=val2#fragment bar... foo http://youtube.com/(file\'s_name.txt) bar... (with \' and (parentheses)) foo http://vimeo.com bar... foo http://vimeo.com:80 bar... foo http://vimeo.com:80/path/ bar... foo http://vimeo.com:80/path/file.txt bar... foo http://vimeo.com:80/path/file.txt?query=val&var2=val2 bar... foo http://vimeo.com:80/path/file.txt?query=val&var2=val2#fragment bar... foo http://vimeo.com/(file\'s_name.txt) bar... (with \' and (parentheses)) '; // Verify it works... echo(linkify_filtered($data) ."\n"); ?>
这使用callback函数来进行过滤。 是的，正则expression式很复杂（但事实certificate这是个问题）。 您可以在这里看到linkify()的交互式Javascript版本： URL链接（HTTP / FTP） 。
此外，约翰格鲁伯有一个相当不错的正则expression式做链接。 请参阅： 改进的自由准确的正则expression式来匹配URL 。 然而，他的正则expression式在某些情况下遭受了灾难性的回溯 。 （我已经写信给他了，但他还没有回应。）
希望这可以帮助！ 🙂
那么，这是相当好的，但仍然是一个巨大的问题，现有的锚在string，我想链接文本没有把它们变成一个毫无意义的一块sh.t.
$string = "some text and a link http://www.google.com" $new_string = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]","<a href=\"\\0\">\\0</a>", $string)
或使用：
