You can change the timezone with this:

    $timestamp = &#39;2014-02-06 16:34:00&#39;;
    $date = Carbon::createFromFormat(&#39;Y-m-d H:i:s&#39;, $timestamp, &#39;Europe/Stockholm&#39;);
    $date-&gt;setTimezone(&#39;UTC&#39;);

I am little confused about using `StringBuilder` class, first:
&gt; A `string` object concatenation operation always creates a new object from the existing `string` and the new data. A `StringBuilder` object maintains a buffer to accommodate the concatenation of new data. New data is appended to the end of the buffer if room is available; otherwise, a new, larger buffer is allocated, data from the original buffer is copied to the new buffer, then the new data is appended to the new buffer.

But where is the point of creating `StringBuilder` instance to avoid creating new one of `String`? It sounds like trading &quot;one for one&quot;.

    static void Main(string[] args)
    {
        String foo = &quot;123&quot;;
        using (StringBuilder sb = new StringBuilder(foo)) // also sb isn&#39;t disposable, so there will be error
        {
            sb.Append(&quot;456&quot;);
            foo = sb.ToString();
        }

        Console.WriteLine(foo);
        Console.ReadKey();
    }

Why I shouldn&#39;t just use

    +=

***Edit:*** Ok, I know now how to reuse one instance of `StringBuilder` (still don&#39;t know if this is right with code standards), but this isn&#39;t worth to use with just one `string`, isn&#39;t it?

How to use StringBuilder wisely?

I am new to R. I want to fill in an empty matrix with the results of my `for` loop using `cbind`. My question is, how can I eliminate the NAs in the first column of my matrix. I include my code below: 

    output&lt;-matrix(,15,) ##generate an empty matrix with 15 rows, the first column already filled with NAs, is there any way to leave the first column empty?
    
    for(`enter code here`){
      normF&lt;-`enter code here`
      output&lt;-cbind(output,normF)
    }

The output is the matrix I expected. The only issue is that its first column is filled with NAs. How can I delete those NAs?

How to create an empty matrix in R?

How do I get the UTC date with [Carbon][1] if I use another timezone?

    $timestamp = &#39;2014-02-06 16:34:00&#39;;
    Carbon::createFromFormat(&#39;Y-m-d H:i:s&#39;, $timestamp)-&gt;timezone(&#39;Europe/Stockholm&#39;);

I create with a `Europe/Stockholm` timezone. How do I get the UTC date from that (2014-02-06 15:34)?


  [1]: https://github.com/briannesbitt/Carbon

Get UTC from another timezone with Carbon

How do I get the UTC date with <a href="https://github.com/briannesbitt/Carbon" target="_blank" rel="noopener noreferrer">Carbon</a> if I use another timezone?
<pre><code class="hljs language-php">$timestamp = '2014-02-06 16:34:00';
Carbon::createFromFormat('Y-m-d H:i:s', $timestamp)->timezone('Europe/Stockholm');
</code></pre>
I create with a <code>Europe/Stockholm</code> timezone. How do I get the UTC date from that (2014-02-06 15:34)?

I would like to be able test that a result is an integer (1,2,3...) where the function could return any number, e.g.:

    $new_id = generate_id();

I had thought it would be something like:

    $this-&gt;assertInstanceOf(&#39;int&#39;, $new_id);

But I get this error:

**Argument #1 of PHPUnit_Framework_Assert::assertInstanceOf() must be a class or interface name**


How do I assert the result is an integer in PHPUnit?

I am new to symfony2 and reading [symblog][1]. In third chapter while trying with data-fixtures I tried the command: 

`php composer.phar update` 

but I got the error: 

`Could not open input file: composer.phar`

So I googled a little and tried 

    php composer.phar install

but still getting the same error. So please guide how to deal with this composer to install new extentions or bundles like data-fixtures in symfony2 using wamp.

  [1]: http://tutorial.symblog.co.uk/#tutorial-parts

Running Composer returns: &quot;Could not open input file: composer.phar&quot;

I&#39;m working on a web service which requires a new `GUID()` passed as a reference to a method within the service. 

I am not familiar with `C#` or the `GUID() object`, but require something similar for `PHP` (so create a new object which from my understanding returns an `empty/blank GUID`). 

Any ideas?

How to generate a new GUID?

I try to use a simple loop, in my real code this loop is more complex, and I need to `break` this iteration like:

    {% for post in posts %}
        {% if post.id == 10 %}
            {# break #}
        {% endif %}
        &lt;h2&gt;{{ post.heading }}&lt;/h2&gt;
    {% endfor %}

How can I use behavior of `break` or `continue` of PHP control structures in Twig?

How can I use break or continue within for loop in Twig template?

I&#39;ve been working on a shopping cart application and now I&#39;ve come to the following issue..

**There is a User, a Product and a Cart object.**   
 - The Cart table only contains the following columns: `id`, `user_id`, `product_id` and timestamps.  
 - The UserModel `hasMany` Carts (because a user can store multiple products).  
 - The CartModel `belongsTo` a User and CartModel `hasMany` Products.  

Now to calculate the total products I can just call: `Auth::user()-&gt;cart()-&gt;count()`.  
  
My question is: How can I get the `SUM()` of prices (a column of product) of the products in cart by this User?  
I would like to accomplish this with Eloquent and not by using a query (mainly because I believe it is a lot cleaner).


Laravel Eloquent Sum of relation&#39;s column

I have two timestamps, edited_at which I created and created_at (Laravel&#39;s)... 
In database, both have type timestamp and default value 0000-00-00 00:00:00... But 

`var_dump(edited_at variable)` is giving string. While `var_dump(created_at variable)` is object/Carbon. What is wrong with these timestamps?

I have to compare both after converting into integer using format(&#39;U&#39;). I can only call this method on Carbon Object. How can I do that?



How to compare two Carbon Timestamps?

I am using carbon but trying to get the first day of the month so I can run a report from the beginning of the month till the current day.

        $date = [
            &#39;start&#39; =&gt; new \Carbon\Carbon(&#39;last month&#39;),
            &#39;end&#39; =&gt; new \Carbon\Carbon(&#39;today&#39;)
        ];

The above code will show todays date back to same date in the previous month. But I want to get from the 1st to now.

Is there an easy way to do this like I am above? Cant find anything in the docs.

Carbon - get first day of month

How can I get all dates between two dates in PHP? Prefer using Carbon for dates.

    $from = Carbon::now();
    $to = Carbon::createFromDate(2017, 5, 21);

I wanna have all dates between those two dates.. But how? Can only found solutions using strtotime function.

PHP Carbon, get all dates between date range?

I am using Laravel 5.1

Few days ago I used `protected $dates = [&#39;license_expire&#39;]` in my model to convert the string date to Carbon instances. In HTML the default value in create form for the date was `Carbon\Carbon::now()-&gt;format(&#39;Y-m-d&#39;)`

In order to show alert in home page i used `&lt;p&gt;Licence Expired: &lt;b&gt;{{ $employee-&gt;license_expire &lt; Carbon\Carbon::now()?&#39;License has expired&#39;:$employee-&gt;license_expire-&gt;diffForHumans() }}&lt;/b&gt;&lt;/p&gt;`

Till then diffForHumans() method works fine.

But in that case the edit form&#39;s default value also was today&#39;s date no matter what was in database(I am using a partial form). To resolve it I change the default value in HTML was NUll. And add another method in my model to show current date in create form.

    public function getLicenseExpireAttribute($date)
    {
        return Carbon::parse($date)-&gt;format(&#39;Y-m-d&#39;);
    }
After that when i go to home page i have an `FatalErrorException` which says `Call to a member function diffForHumans() on string`

When I check the date with `dd($employee-&gt;license_expire)` it become STRING again.

Can anybody tell me how can I convert the string to Carbon in this situation?

or

Make my create form&#39;s default date as today&#39;s date, the edit form&#39;s date from database and I can use diffForHumans() to show alert in home page?

Convert String to Carbon

I want to get current timestamp in laravel 5 and I have done this-

    $current_time = Carbon\Carbon::now()-&gt;toDateTimeString();

I am getting eror- &#39;Carbon not found&#39;-

[![enter image description here][1]][1]

What can I do?

Can anyone help, please?


  [1]: http://i.stack.imgur.com/O3BkQ.png

Content Type	Original Author	Original Content on Stackoverflow
Question	Marwelln	View Question on Stackoverflow
Solution 1 - Php	Marwelln	View Answer on Stackoverflow

Get UTC from another timezone with Carbon

Php Problem Overview

Php Solutions

Solution 1 - Php

How to create an empty matrix in R?

How to use StringBuilder wisely?

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