PHP: How do I linkify all links inside a given text? - php

Question

I am using the tool https://github.com/jmrware/LinkifyURL to detect URLs in a text unit. Unfortunately, it only recognizes one URL in the whole text. For example, if the text ought to be:
http://www.guiageo-americas.com/imagens/imagem-america-do-sul.jpg I
really think this should be working
http://www.youtube.com/watch?v=Cy8duEIHEig more text and some writing
here and there
what appears is:
http://www.guiageo-americas.com/imagens/imagem-america-do-sul.jpg I
really think this should be working
http://www.youtube.com/watch?v=Cy8duEIHEig more text and some writing
here and there
and what I want is:
http://www.guiageo-americas.com/imagens/imagem-america-do-sul.jpg I
really think this should be working
http://www.youtube.com/watch?v=Cy8duEIHEig more text and some writing
here and there
Any idea on why? Of course, I'll leave the PHP code here:
function linkify($text) {
/* $text being "http://www.guiageo-americas.com/imagens/imagem-america-do-sul.jpg I really think this should be working http://www.youtube.com/watch?v=Cy8duEIHEig more text and some writing here and there" */
$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';
//below goes my code
$url_replace = '$1$4$7$10$13<a style="color:blue;" onclick="toogleIframe(this)">$2$5$8$11$14</a>$3$6$9$12';
//echo preg_replace($url_pattern, $url_replace, $text);
return preg_replace($url_pattern, $url_replace, $text);
}

Answer 1

That's the kind of thing best left to a 3rd party library (which you're doing, so kudos). I'd recommend trying another one before you roll your own. purl is an excellent alternative.

Answer 2

You can use the following to replace all matches of your regex (though, I won't count on its performance):
while (preg_match($pattern, $string)) {
$string = preg_replace($pattern, $replacement, $string);
}
So, your function will become:
function linkify($text) {
$url_pattern = "<your-pattern-string">;
$url_replace = "<your-replacement-string">;
while (preg_match($url_pattern, $url_replace, $text) {
$text = preg_replace($url_pattern, $url_replace, $text);
}
return $text;
}