I would like to know what is the meaning of count argument in str_replace() function of PHP. This argument is optional. We have to pass it through reference. But why? What is it for? How can I use it?
Syntax of str_replace():
str_replace(searchValue, replaceValue, String, [&count]);
Refenrence: http://php.net/manual/en/function.str-replace.php
Thank you.
Related
When I do something similar to the following example, it results in the Cannot convert lambda expression to type 'string' because it is not a delegate type error. I'm not sure if that is a normal behavior or there's something wrong with how I use it.
#(Html.Kendo.Dialog().Content(#<text> Some Html Code </text>))
However, what do I have to do if I wanna pass something like that, let's say a long html code containing scripts, etc., to a helper function?
Is there a way to put a variable in a io:get_line() code? I tried
io:get_line("~s: ",[Variable]).
but it doesn't work. So my question is there another implementation for this?
You can pass the format string and arguments to io_lib:format/2 first, and then send that to io:get_line/1:
1> Variable = "Name".
"Name"
2> io:get_line(io_lib:format("~s: ", [Variable])).
Name: Dogbert
"Dogbert\n"
You can use fread/3 function:
Reads characters from the standard input (IoDevice), prompting it with Prompt. Interprets the characters in accordance with Format. Format contains control sequences that directs the interpretation of the input.
I want to pass a variable named as \Set in query string. Can anyone please help me how to pass this in query string of url because currently I am getting 404 error.
You would need to URL-encode characters which otherwise already have meanings in a URL.
So this:
\Set
Becomes this:
%5CSet
it's possible in rails convert variable name to string?
Example:
stack_overflow = "Fantastic!".
by stack_overflow.to_sym I'll get :Fantastic!.
Instead I would => :stack_overflow
and, if it were possibile, this would be bad programming cause unsafe code?
Thanks :-)
You'd need to use eval(), although I don't know the specific way you'd achieve what you want:
new_var = eval(stack_overflow.to_sym)
I'm building an app in Rails 3 and I need a method to extract all urls from a string and store them in a hash or something. I know I need to use regular expressions but I don't know where exactly to begin with them.
Also, I know about auto_link, but it doesn't quite do what I'm trying to achieve. I just simply need a hash of all the url's from a string.
Thanks!
From http://www.regular-expressions.info/ruby.html
"To collect all regex matches in a string into an array, pass the regexp object to the string's scan() method, e.g.: myarray = mystring.scan(/regex/)."
So you probably need strings that start with "http". So check the docs for that :)
I don't program in Ruby and I'm not very good with regex but maybe this will help you out:
http://www.ozzu.com/programming-forum/url-regex-t104809.html