Convert comma separated string into array - php

Question

I have a comma separated string, which consists of a list of tags and want to convert it to array to get a link for every tag.
Example:
$string = 'html,css,php,mysql,javascript';
I want to make it like this:
html, css, php, mysql, javascript
So the result will be a string containing comma separated links with a space after each link and with no comma after the last link.
I have this function where $arg = 'html,css,php,mysql,javascript':
function info_get_tags( $arg ) {
global $u;
$tagss = '';
if ( $arg == '' ) {
return '';
} else {
$tags_arr = explode( ',' , $arg );
foreach ( $tags_arr as $tag ) {
$tags = '' . $tag . '';
$tagss .= $tags;
}
return $tagss;
}
}
This script works for me but without commas and spaces and if we add a comma and a space here:
$tags = '' . $tag . ', ';
we get commas and spaces but there will be a trailing comma after the last link.

Answer 1

Just like you exploded you can implode again:
$tags = explode(',', $arg);
foreach ($tags as &$tag) {
$tag = '' . $tag . '';
}
return implode(', ', $tags);

Answer 2

Here's an alternative that uses array_map instead of the foreach loop:
global $u;
function add_html($tag){
return('' . $tag . '');
}
function get_tags($taglist){
$tags_arr = array_map("add_html", explode( ',' , $taglist));
return implode(", " , $tags_arr);
}

Answer 3

Try this short code
$string = 'html,css,php,mysql,javascript';
$string = explode(',', $string);
   foreach( $string as $link){
   echo ''.$link.'';
}

Answer 4

Easiest way is to the html into an array (each tag link is an array element) and then implode on ,...
if ( $arg == '' ) {
return '';
} else {
$tags_arr = explode( ',' , $arg );
$tags = array();
$tagtpl = '%s';
foreach ( $tags_arr as $tag ) {
$url = $u . 'tag/' . $tag . '/';
$tags[] = sprintf($tagtpl, $url, $tag, $tag);
}
return implode(', ', $tags);
}

Answer 5

Try this
$tagss = trim($tagss);
return substr($tagss, 0 , strlen($tagss)-1);

Answer 6

Why not put all tags in an array when you are creating them, and later explode the array and add the commas and spaces between the tags.
foreach ( $tags_arr as $tag ) {
$tags = '' . $tag . '';
$tagss[] = $tags;
}
$tagss = explode(', ', $tagss);

Answer 7

The workaround(!) would be to remove the unwanted trailing characters afterwards:
$tagss = rtrim($tagss, ", ");
This rtrim removes any mix of spaces and commas from the right end of the string.
Btw, you could use str_getcsv instead of explode, which also handles input spaces better.

Answer 8

function info_get_tags($arg)
{
global $u;
if (empty($arg)) return '';
return ltrim(preg_replace('/([^\,]+)/', ' ${1}', $arg));
}

Answer 9

$string = 'html,css,php,mysql,javascript';
puts $string.split(/,/).map { |tag| "#{tag}"}.join(", ")
result:
html, css, php, mysql, javascript

Answer 10

Another solution:
$html = trim(preg_replace('/([^,]+)/', ' \1', $string));
Or if you have to html encode the tags (always smart, since you're creating html from text):
$html = trim(preg_replace_callback('/([^,]+)/', function($match) {
$tag = $match[1];
return ' ' . htmlspecialchars($tag) . '';
}, $string));
So this $string would work too: "tag with space,html,css,php,mysql,javascript"
More regex is always good!