This is the second of a few functions that will linkify text with PHP (see the first here). Based on WordPress' make_clickable() 
function, this function will create hyperlinks from URLs, partial URLs (no schema), FTP addresses, and emails. If you would like to shorten a URL in addition to creating an active link, modify beliefmedia_create_short() (as provided in the previous function) as required.
Ensure you close the pre tag on line 23. It had to be removed to preserve page formatting. Download the code below to avoid errors.
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<?php
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/*
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Linkify a URL With PHP (Version 2)
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http://www.beliefmedia.com/code/php-snippets/linkify-links-php
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*/
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function beliefmedia_linkify($text) {
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$r = '';
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/* Split out HTML tags */
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/* Keep track of how many levels link is nested inside < pre > or <code> */
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$nested_code_pre = 0;
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foreach ( $textarr as $piece ) {
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if ( preg_match( '|^<code[\s>]|i', $piece ) || preg_match( '|^<pre[\s>]|i', $piece ) || preg_match( '|^<script[\s>]|i', $piece ) || preg_match( '|^<style[\s>]|i', $piece ) )
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$nested_code_pre++;
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/* Make sure you close the pre tags on this line. Had to remove for formatting. Best to download the code... */
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elseif ( $nested_code_pre && ( '</code>' === strtolower( $piece ) || '/pre' === strtolower( $piece ) || '</script>' === strtolower( $piece ) || '</style>
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$nested_code_pre--;
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if ( $nested_code_pre || empty( $piece ) || ( $piece[0] === '<' && ! preg_match( '|^<\s*[\w]{1,20}+://|', $piece ) ) ) {
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$r .= $piece;
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continue;
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}
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/* Long strings might contain expensive edge cases ... */
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/* ... break it up (2100: Extra room for scheme and leading and trailing paretheses) */
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foreach ( bm_split_str_by_whitespace( $piece, 2100 ) as $chunk ) {
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$r .= $chunk; // Too big, no whitespace: bail.
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} else {
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$r .= beliefmedia_linkify($chunk);
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}
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}
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} else {
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/* Pad with whitespace to simplify the regexes */
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$ret = " $piece ";
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$url_clickable = '~([\\s(<.,;:!?])([\\w]{1,20}+://(?=\S{1,2000}\s)[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+(?:[\'.,;:!?)][\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++)*)(\)?)~xS';
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/* Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times */
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$ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', 'beliefmedia_ftp_clickable', $ret );
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$ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', 'beliefmedia_email_clickable', $ret );
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/* Remove our whitespace padding */
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$r .= $ret;
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}
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}
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/* Cleanup of accidental links within links */
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}
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function beliefmedia_email_clickable( $matches ) {
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$email = $matches[2] . '@' . $matches[3];
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return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
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}
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function beliefmedia_ftp_clickable($matches) {
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$ret = '';
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$dest = $matches[2];
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$dest = 'http://' . $dest;
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/* removed trailing [.,;:)] from URL */
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}
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/* $dest = esc_url($dest); */
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if (empty($dest)) return $matches[0];
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return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\" target=\"_blank\">$dest</a>$ret";
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}
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function bm_split_str_by_whitespace($string, $goal) {
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$chunks = array();
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if (false === $pos) {
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if (false === $pos) {
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break;
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}
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}
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}
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if ($string) $chunks[] = $string;
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return $chunks;
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}
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function beliefmedia_url_clickable( $matches ) {
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$url = $matches[2];
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/* If trailing character is a closing parethesis, and URL has an opening parenthesis in it, add closing parenthesis to the URL */
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$url .= $matches[3];
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$suffix = '';
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} else {
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$suffix = $matches[3];
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}
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/* Include parentheses in the URL only if paired */
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}
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if (empty($url)) return $matches[0];
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return $matches[1] . "<a href=\"$url\" rel=\"nofollow\" target=\"_blank\">$url</a>" . $suffix;
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}
Usage is as follows:
The function will return the following:
Fully constructed URL: http://www.beliefmedia.com/. Partial URL (no schema): http://www.flight.org/. Email: email marty@test.com.
