I'm not sure what the terminology is, but basically I have a site that uses the "tag-it" system, currently you can click on the tags and it takes the user to
topics.php?tags=example
My question is what sort of scripting or coding would be required to be able to add additional links?
topics.php?tags=example&tags=example2
or
topics.php?tags=example+example2
Here is the code in how my site is linked to tags.
header("Location: topics.php?tags={$t}");
or
<?php echo strtolower($fetch_name->tags);?>
Thanks for any hints or tips.
You cannot really pass tags two times as a GET parameter although you can pass it as an array
topics.php?tags[]=example&tags[]=example2
Assuming this is what you want try
$string = "topics.php?";
foreach($tags as $t)
{
$string .= "tag[]=$t&";
}
$string = substr($string, 0, -1);
We iterate through the array concatenating value to our $string. The last line removes an extra & symbol that will appear after the last iteration
There is also another option that looks a bit more dirty but might be better depending on your needs
$string = "topics.php?tag[]=" . implode($tags, "&tag[]=");
Note Just make sure the tags array is not empty
topics.php?tags=example&tags=example2
will break in the back end;
you have to assign the data to one variable:
topics.php?tags=example+example2
looks good you can access it in the back end explode it by the + sign:
//toplics.php
<?php
...
$tags = urlencode($_GET['tags']);
$tags_arr = explode('+', $tags); // array of all tags
$current_tags = ""; //make this accessible in the view;
if($tags){
$current_tags = $tags ."+";
}
//show your data
?>
Edit:
you can create the fron-end tags:
<a href="topics.php?tags=<?php echo $current_tags ;?>horror">
horror
</a>
Related
I am making a price crawler for a project but am running into a bit of an issue. I am using the below code to extract values from an html page:
$content = file_get_contents($_POST['url']);
$resultsArray = array();
$sqlresult = array();
$priceElement = explode( '<div>value I want to extract</div>' , $content );
Now when I use this to get certain elements I only get back
Finance: {{value * value2}}
I want to get the actual value that would be displayed on the screen e.g
Finance: 7.96
The other php methods I have tried are:
curl
file_get_html(using simple_html_dom library)
None of these work either :( Any ideas what I can do?
You just set the <div>value I want to extract</div> as a delimiter, which means PHP looks for it to separate your string to array whenever this occurs.
In the following code we use , character as a delimiter:
<?php
$string = "apple,banana,lemon";
$array = explode(',', $string);
echo $array[1];
?>
The output should be this:
banana
In your example you set the value you want to extract as a delimiter. That's why this happens to you. You'll need to set a delimiter between your string you want to obtain and other string you won't need at the moment.
For example:
<?php
$string = "iDontNeedThis-dontExtractNow-value I want to extract-dontNeedEither";
$priceElement = explode('-', $string);
echo "<div>".$priceElement[2]."</div>";
?>
The code should output this to your HTML page:
<div>value I want to extract</div>
And it will appear on your page like this:
value I want to extract
If you don't need to save the whole array in a variable, you can save the one index of it to variable instead:
$priceElement = explode('-', $string)[2];
echo $priceElement;
This will save only value I want to extract so you won't have to deal with arrays later on.
I use PHP Simple Html Dom to get some html,now i have a html dom like follow code,i need fetch the plain text inner div,but avoiding the p tags and their content（only return 111111）, who can help me?Thanks in advance!
<div>
<p>00000000</p>
111111
<p>22222222</p>
</div>
It depends on what you mean by "avoiding the p tags".
If you just want to remove the tags, then just running strip_tags() on it should work for what you want.
If you actually want to just return "11111" (ie. strip the tags and their contents) then this isn't a viable solution. For that, something like this may work:
$myDiv = $html->find('div'); // wherever your the div you're ending up with is
$children = $myDiv->children; // get an array of children
foreach ($children AS $child) {
$child->outertext = ''; // This removes the element, but MAY NOT remove it from the original $myDiv
}
echo $myDiv->innertext;
If you text is always at the same position , try this:
$html->find('text', 2)->plaintext; // should return 111111
Here is my solution
I want to get the Primary Text part only.
$title_obj = $article->find(".ofr-descptxt",0); //Store the Original Tree ie) h3 tag
$title_obj->children(0)->outertext = ""; //Unset <br/>
$title_obj->children(1)->outertext = ""; //Unset the last Span
echo $title_obj; //It has only first element
Edited:
If you have PHP errors
Try to enclose with If else or try my lazy code
($title_obj->children(0))?$title_obj->children(0)->outertext="":"";
($title_obj->children(1))?$title_obj->children(1)->outertext = "":"";
Official Documentation
$wordlist = array("<p>", "</p>")
foreach($wordlist as $word)
$string = str_replace($word, "", $string);
I need a solution, that enables me to show below a listing on a wordpress page only tags that don't contain a number.
This is my code:
<?php
$tags_html = '';
foreach($tags as $single_tag)
{
$count++;
if (1 == $count)
{
$tags_html .= ''.$single_tag->name.', ';
}
//// ADDS TO OUR MARKUP
}
//// TRIMS LAST COME
echo rtrim($tags_html, ', ');
?>
</span>
<?php }
?>
All tags that belongs to a Post/Listing that contains a number should not be show, tags that did not contain a number could be shown below the listing.
Any Idea?
I can't know the exact structure of $single_tag unless you post a var_dump() of it, but here's the if code you would need to prevent displaying tags with numeric content:
if(!preg_match('/\d/',$single_tag))
{
$tags_html .= ''.$single_tag->name.', ';
}
It uses the \d regular expression escape sequence to check if the string contains numbers.
If your tags are in a string, you would need these two lines (to build an array)
$string = '34hj, wer, wer35, rwer, 5345, 5dgg45, sdfa';
$tags = explode(',', $string);
otherwise, if your tags are already in an array, like below, you don't need the above
$tags = array('34hj', 'wer', 'wer35', 'rwer', '5345', '5dgg45', 'sdfa');
and finally, you need this snippet which will exclude tags that contain any number.
foreach($tags as $tag) {
if(preg_match('/^[^\d]+$/', $tag));
echo trim($tag) . "\n";
}
Working demo
Is there a built in php function that will return an array (or some sort of list) of all the form elements within a div or within a specific form by either name or id?
My limited experience in javascript tells me that this can probably be occomplished with javascript but i am wondering if it can be done in php. Thanks for your help.
My only other alternative would be to define a variable at the bottom of each form element like:
$allElements = 'name';
$allElements .= ', phone';
$allElements .= ', email';
and so on.
I am wondering if there is a short cut to this method?
You are going to want to parse the HTML.
$HTML = '<div name="phone"></div>';
$string = strstr($HTML, 'name=\"');
$string = strstr($string, '\"');
something like that...
these are your best friends:
stripos()
strrpos()
strripos()
strstr()
strpbrk()
substr()
Don't really know what you exactly mean.
All variables from a sent form are stored in the $_POST global variable. This will show you the list:
if ($_POST) {
echo '<pre>';
echo print_r($_POST);
echo '</pre>';
}
Maybe you need to parse HTML with PHP - see the answer above.
UPDATE:
Thank you all for your input. Some additional information.
It's really just a small chunk of markup (20 lines) I'm working with and had aimed to to leverage a regex to do the work.
I also do have the ability to hack up the script (an ecommerce one) to insert the classes as the navigation is built. I wanted to limit the number of hacks I have in place to keep things easier on myself when I go to update to the latest version of the software.
With that said, I'm pretty aware of my situation and the various options available to me. The first part of my regex works as expected. I posted really more or less to see if someone would say, "hey dummy, this is easy just change this....."
After coming close with a few of my efforts, it's more of the principle at this point. To just know (and learn) a solution exists for this problem. I also hate being beaten by a piece of code.
ORIGINAL:
I'm trying to leverage regular expressions to add a CSS a class to the first and last list items within an ordered list. I've tried a bunch of different ways but can't produce the results I'm looking for.
I've got a regular expression for the first list item but can't seem to figure a correct one out for the last. Here is what I'm working with:
$patterns = array('/<ul+([^<]*)<li/m', '/<([^<]*)(?<=<li)(.*)<\/ul>/s');
$replace = array('<ul$1<li class="first"','<li class="last"$2$3</ul>');
$navigation = preg_replace($patterns, $replace, $navigation);
Any help would be greatly appreciated.
Jamie Zawinski would have something to say about this...
Do you have a proper HTML parser? I don't know if there's anything like hpricot available for PHP, but that's the right way to deal with it. You could at least employ hpricot to do the first cleanup for you.
If you're actually generating the HTML -- do it there. It looks like you want to generate some navigation and have a .first and .last kind of thing on it. Take a step back and try that.
+1 to generating the right html as the best option.
But a completely different approach, which may or may not be acceptable to you: you could use javascript.
This uses jquery to make it easy ...
$(document).ready(
function() {
$('#id-of-ul:firstChild').addClass('first');
$('#id-of-ul:lastChild').addClass('last');
}
);
As I say, may or may not be any use in this case, but I think its a valid solution to the problem in some cases.
PS: You say ordered list, then give ul in your example. ol = ordered list, ul = unordered list
You wrote:
$patterns = array('/<ul+([^<]*)<li/m','/<([^<]*)(?<=<li)(.*)<\/ul>/s');
First pattern:
ul+ => you search something like ullll...
The m modifier is useless here, since you don't use ^ nor $.
Second pattern:
Using .* along with s is "dangerous", because you might select the whole document up to the last /ul of the page...
And well, I would just drop s modifier and use: (<li\s)(.*?</li>\s*</ul>) with replace: '$1class="last" $2'
In view of above remarks, I would write the first expression: <ul.*?>\s*<li
Although I am tired of seeing the Jamie Zawinski quote each time there is a regex question, Dustin is right in pointing you to a HTML parser (or just generating the right HTML from the start!): regexes and HTML doesn't mix well, because HTML syntax is complex, and unless you act on a well known machine generated output with very predictable result, you are prone to get something breaking in some cases.
I don't know if anyone cares any longer, but I have a solution that works in my simple test case (and I believe it should work in the general case).
First, let me point out two things: While PhiLho is right in that the s is "dangerous", since dots may match everything up to the final of the document, this may very well be what you want. It only becomes a problem with not well formed pages. Be careful with any such regex on large, manually written pages.
Second, php has a special meaning of backslashes, even in single quotes. Most regexen will perform well either way, but you should always double-escape them, just in case.
Now, here's my code:
<?php
$navigation='<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>
<li>Beer</li>
<li>Water</li>
</ul>';
$patterns = array('/<ul.*?>\\s*<li/',
'/<li((.(?<!<li))*?<\\/ul>)/s');
$replace = array('$0 class="first"',
'<li class="last"$1');
$navigation = preg_replace($patterns, $replace, $navigation);
echo $navigation;
?>
This will output
<ul>
<li class="first">Coffee</li>
<li>Tea</li>
<li>Milk</li>
<li>Beer</li>
<li class="last">Water</li>
</ul>
This assumes no line feeds inside the opening <ul...> tag. If there are any, use the s modifier on the first expression too.
The magic happens in (.(?<!<li))*?. This will match any character (the dot) that is not the beginning of the string <li, repeated any amount of times (the *) in a non-greedy fashion (the ?).
Of course, the whole thing would have to be expanded if there is a chance the list items already have the class attribute set. Also, if there is only one list item, it will match twice, giving it two such attributes. At least for xhtml, this would break validation.
You could load the navigation in a SimpleXML object and work with that. This prevents you from breaking your markup with some crazy regex :)
As a preface .. this is waaay over-complicating things in most use-cases. Please see other answers for more sanity :)
Here is a little PHP class I wrote to solve a similar problem. It adds 'first', 'last' and any other classes you want. It will handle li's with no "class" attribute as well as those that already have some class(es).
<?php
/**
* Modify list items in pre-rendered html.
*
* Usage Example:
* $replaced_text = ListAlter::addClasses($original_html, array('cool', 'awsome'));
*/
class ListAlter {
private $classes = array();
private $classes_found = FALSE;
private $count = 0;
private $total = 0;
// No public instances.
private function __construct() {}
/**
* Adds 'first', 'last', and any extra classes you want.
*/
static function addClasses($html, $extra_classes = array()) {
$instance = new self();
$instance->classes = $extra_classes;
$total = preg_match_all('~<li([^>]*?)>~', $html, $matches);
$instance->total = $total ? $total : 0;
return preg_replace_callback('~<li([^>]*?)>~', array($instance, 'processListItem'), $html);
}
private function processListItem($matches) {
$this->count++;
$this->classes_found = FALSE;
$processed = preg_replace_callback('~(\w+)="(.*?)"~', array($this, 'appendClasses'), $matches[0]);
if (!$this->classes_found) {
$classes = $this->classes;
if ($this->count == 1) {
$classes[] = 'first';
}
if ($this->count == $this->total) {
$classes[] = 'last';
}
if (!empty($classes)) {
$processed = rtrim($matches[0], '>') . ' class="' . implode(' ', $classes) . '">';
}
}
return $processed;
}
private function appendClasses($matches) {
array_shift($matches);
list($name, $value) = $matches;
if ($name == 'class') {
$value = array_filter(explode(' ', $value));
$value = array_merge($value, $this->classes);
if ($this->count == 1) {
$value[] = 'first';
}
if ($this->count == $this->total) {
$value[] = 'last';
}
$value = implode(' ', $value);
$this->classes_found = TRUE;
}
return sprintf('%s="%s"', $name, $value);
}
}