## Get user meta for only the keys with the prefix my_theme

There is a list of meta keys with the prefix my_theme, these are updated by the user. My problem is how to get_user_meta for only the keys with my_theme prefix. Tried a wildcard, didn’t work.

get_user_meta( $user_id, 'my_theme%', true );  ## Pre-Fix Order Numbers by User Role I currently have orders set with the pre-fix "W" for Wholesale orders to differentiate them from Retail orders. However, we have a few different wholesale roles and I would like to be able to differentiate those orders with a pre-fix as well. Is there a way to code a special pre-fix based on user role? The role in particular would be for a wholesale role labeled as employee. Since Employee falls under the Wholesale Role, it is getting the W prefix to their orders. I would like all other wholesale orders to have the W prefix, Employee orders to have an E prefix, and all retail orders to have no prefix (remain as-is). Here is the snippet that works for wholesale orders to have the W prefix: add_filter( 'woocommerce_order_number', 'change_woocommerce_order_number' ); function change_woocommerce_order_number($  order_id ) {       $prefix = 'W'; //The Prefix$  order_type = get_post_meta( $order_id, '_wwpp_order_type',true); //get Wholesale Order Type if ($  order_type == 'wholesale') {         $new_order_id =$  prefix . $order_id; return$  new_order_id;     }           return $order_id; }  ## Freenom domain on Google Site: doesn’t work without prefix “www.” I created the domain example.tk on Freenom. I use that URL on a Google Site. Everything works accordingly if you use "www.example.tk". However if I only type "example.tk" nothing is displayed. Can you please help me on this? Thank you! ## How to add a prefix to a WordPress post preview url? I need to remove any query parameters from the WordPress post preview URL. I need to access https://www.domain.com/prefix/12345 and see the same post preview I would see on https://www.domain.com/?p=12345&preview=true It can not redirect, the URL in the browser must still be https://www.domain.com/prefix/12345 As an alternative, adding a prefix to the original WordPress post preview url would also be enough: https://www.domain.com/previx/?p=12345&preview=true How can I achieve one of these without changing the URLs of the published posts? The motivations is that I need a URL with a prefix to create a bypass rule on CloudFlare Workers. ## Is there a way to determine whether a list of integers can be a prefix function? Say you had (0,0,0,1,2,3,4,5,6,7,8,9,10) or (0,1,0,1,0,1,2,3,0,1,0,0,1) Could you use, for example, the KMP algorithm to deduce the validity of the above lists as prefix functions? I know there is a way to find whether a substring exists in a string using KMP, but is there a way to do it the other way around, starting at the apparent prefix function and ascertaining that it is indeed a possible prefix function, without knowing the string/substring itself at the start? ## How does a prefix sum with 8 elements can be computed with three processors? I would like to know if someone can give me an example of how a prefix sum which contains 8 elements can be computed with just three processors. Prefix sum ## Is grammar that describes an equation in prefix (Polish) notation always unambiguous? I recently completed a problem in which I was asked to generate a parse tree for the expression $$+ \, 5 \, * \, 4 \, 3$$ using the following grammar and rightmost derivation: $$Expr \rightarrow + \, Expr \, Expr \, | \, * \, Expr \, Expr \, | \, 0 \, | \, \dots \, | \, 9 \,$$ While I have no trouble taking the derivation and creating its parse tree, the question also asks whether the grammar is ambiguous. In the scope of what I’ve been taught, my only tool for proving ambiguity has been to find a different parse tree for whatever leftmost or rightmost derivation I have, thus proving multiple valid parses and ambiguity. However, I have not been told how to prove unambiguity. I am fairly confident that the grammar described above is unambiguous based partially on intuition, and partially because it’s designed for prefix notation. I tried to generate new trees for a given string to prove ambiguity, but since the operator is always leftmost, I could not find any string in which multiple parse trees could be created. If I am mistaken, please let me know. My question is this: Is it possible for grammar that describes strings using prefix (Polish) notation such as the one above to ever be ambiguous? My intuition tells me that it will always be unambiguous, but I was wondering why this might be the case. ## Exploiting LFI with prefix I have a scenario as the following: <?php include("resource/" +$  _GET['vuln']); ?> 

And I’m trying to get RCE from this, or atleast acquire some interesting information.

I already looked at /etc/passwd and other important files, are there things I can do to bypass the resource/ prefix? (since it disables me from using php:// filters)

## How a chosen prefix collision is more useful than a standard collision concerning hashing functions?

Recently a paper has been released about SHA-1 chosen prefix collision.

They present what a chosen prefix collision is, but I don’t understand how is it more interesting than a standard collision ? They briefly mention x509 rogue certificate, but I still can’t get the point.

Can anyone explain to me how interesting it is compared to standard collisions ? Hopefully with an example a bit more detailed ?

Thanks in advance !

## I cant find a solution for a question of an array about prefix sum?

if I was given the shuffled array of a combination of prefix sum array and suffix sum array as Input. How to find out the number of initial array possible which can produce input array (combination prefix and suffix sum arrays).

How will we find whether an input array is valid as sum of prefix sum array and suffix sum array