Created
July 4, 2015 22:14
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Auto convert URL into clickable hyperlink
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In wordpress, if you want to auto convert all URLs in your string into clickable hyperlinks, you can actually do it using the built-in function make_clickable(). If you need to do that outside of wordpress, you can refer to the function’s source code at wp-includes/formatting.php |
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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\">$url</a>" . $ret; | |
} | |
function _make_web_ftp_clickable_cb($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>" . $ret; | |
} | |
function _make_email_clickable_cb($matches) { | |
$email = $matches[2] . '@' . $matches[3]; | |
return $matches[1] . "<a href=\"mailto:$email\">$email</a>"; | |
} | |
function make_clickable($ret) { | |
$ret = ' ' . $ret; | |
// in testing, using arrays here was found to be faster | |
$ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_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; | |
} |
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