This is the first of a few functions that’ll linkify text with PHP. It’s based on WordPress’ make_clickable() 
function. If you would like to shorten a URL in addition to creating an active link, modify the beliefmedia_create_short() function as required. For truncating purposes, clients will likely want to use our own suite of tools.
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/* Linkify a URL With PHP (Version 1) http://www.beliefmedia.com/code/php-snippets/linkify-url-php */ function beliefmedia_linkify($matches, $short = false) { $url = $matches[2]; $url = beliefmedia_clean_url($url); if (empty($url)) return $matches[0]; /* Truncate URL? */ if ($short !== false) $url = beliefmedia_create_short($url); return "{$matches[1]}<a href='{$url}' target='_blank'>{$url}</a>"; } function beliefmedia_create_short($url, $length = '20') { $lengthurl = strlen($url); if ($lengthurl > $length) $url = file_get_contents('http://tinyurl.com/api-create.php?url=' . $url); return $url; } function beliefmedia_clean_url($url) { if ($url == '') return $url; $url = preg_replace( "|[^a-z0-9-~+_.?#=!&;,/:%@$*'()x80-xff]|i", '', $url ); $url = str_replace( array( "%0d", "%0a" ), '', $url ); $url = str_replace( ";//", "://", $url ); /* If the URL doesn't appear to contain a scheme, presume http:// */ if (strpos($url, ':') === false && substr( $url, 0, 1 ) != '/' && !preg_match( "|^[a-z0-9-]+?.php|i", $url ) ) $url = "http://{$url}"; /* Replace ampersans and single quotes */ $url = preg_replace("|&([^#])(?![a-z]{2,8};)|", "&$1", $url); $url = str_replace("'", "'", $url); return $url; } function beliefmedia_transform($text) { $text = " {$text}"; $text = preg_replace_callback('#(?<=[\s>])(\()?([\w]+?://(?:[\w\\x80-\\xff\#$%&~/\-=?@\[\](+]|[.,;:](?![\s<])|(?(1)\)(?![\s<])|\)))*)#is', 'beliefmedia_linkify', $text); $text = preg_replace( '#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', "$1$3</a>", $text ); $text = trim($text); return $text; } |
Usage is as follows:
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$text = "This is the first URL: http://www.beliefmedia.com/, and another: http://www.flight.org"; echo beliefmedia_transform($text); |
Returns the following:
This is the first URL: http://www.beliefmedia.com/, and another: http://www.flight.org
Additional functions that serve a similar purpose are forthcoming.
Short URL for this post: http://shor.tt/17G1
