[array_map()][1] is what you need:

    $result = array_map(&#39;trim&#39;, $source_array);


  [1]: http://php.net/array_map

[`array_map()`][1] applies a given callback to every value of an array and return the results as a new array.

    $array = array_map(&#39;trim&#39;, $array);


  [1]: http://php.net/array-map

I often seen the symbol `1L` (or `2L`, `3L`, etc) appear in R code.  Whats the difference between `1L` and `1`?  `1==1L` evaluates to `TRUE`.   Why is `1L` used in R code?

What&#39;s the difference between `1L` and `1`?

Okay, I got a website where you can register yourself and login. You can also login with your facebook, twitter or linkedin account.

It is important that users only have one account registered. So somehow, I want to merge the accounts of users if they use different methods to login. What is the best solution to solve this?

For instance, the user logs in with his Facebook account. I use the data to register an account for him automatically. Should I sent an e-mail with an username and password of our website? (If this is okay with the policy of Facebook). Should I give them a second screen where they can fill in an username and password? But that&#39;s not the idea behind logging in with your Facebook account. It should simplify your procedure to participate.

It&#39;s also possible the user has registered himself on our website and the next time he logs in with his twitter account. How can I merge these 2 accounts as one? What&#39;s the best way?

So basically my question is: I got 4 different ways a user becomes a member of our website. How can I make sure all these 4 ways only create one account if a user decides to use multiple ways? What&#39;s the best flow to make sure that it doesn&#39;t become a hassle for the user himself?


-------
Edit: 

3 years after I asked this question, I am giving the answer myself in a series of articles: 
https://www.peternijssen.nl/social-network-authentication-setup/    
https://www.peternijssen.nl/social-network-authentication-google/    
https://www.peternijssen.nl/social-network-authentication-merging-accounts/   
https://www.peternijssen.nl/social-network-authentication-twitter-facebook/   

Architecture for merging multiple user accounts together

If I have this array:

    array(&quot;  hey  &quot;, &quot;bla  &quot;, &quot;  test&quot;);

and I want to trim all of them, How can I do that?

The array after the trim:

    array(&quot;hey&quot;, &quot;bla&quot;, &quot;test&quot;);

How can I trim all strings in an Array?

If I have this array:
<pre><code class="hljs language-c">array(" hey ", "bla ", " test");
</code></pre>
and I want to trim all of them, How can I do that?
The array after the trim:
<pre><code class="hljs language-c">array("hey", "bla", "test");
</code></pre>

I have a class that benefits from the use of constants in its internal implementation, but I would like to limit visibility of these constants. Why doesn&#39;t PHP permit private constants?  Is there another way to achieve this or is PHP trying to discourage some type of design misstep I am ignorant of?

Why doesn&#39;t PHP permit private const?

Any way to return PHP `json_encode` with encode UTF-8 and not Unicode?

    $arr=array(&#39;a&#39;=&gt;&#39;&#225;&#39;);
    echo json_encode($arr);

`mb_internal_encoding(&#39;UTF-8&#39;);`and `$arr=array_map(&#39;utf8_encode&#39;,$arr);` does not fix it.


Result: `{&quot;a&quot;:&quot;\u00e1&quot;}`

**Expected result: `{&quot;a&quot;:&quot;&#225;&quot;}`**

Any way to return PHP `json_encode` with encode UTF-8 and not Unicode?

I need to check in PHP if user entered a decimal number (US way, with decimal point: X.XXX)

Any reliable way to do this?

Check if number is decimal

I have an array which is multidimensional for no reason

    /* This is how my array is currently */
    Array
    (
    [0] =&gt; Array
        (
            [0] =&gt; Array
                (
                    [plan] =&gt; basic
                )
 
            [1] =&gt; Array
                (
                    [plan] =&gt; small
                )
 
            [2] =&gt; Array
                (
                    [plan] =&gt; novice
                )
 
            [3] =&gt; Array
                (
                    [plan] =&gt; professional
                )
 
            [4] =&gt; Array
                (
                    [plan] =&gt; master
                )
 
            [5] =&gt; Array
                (
                    [plan] =&gt; promo
                )
 
            [6] =&gt; Array
                (
                    [plan] =&gt; newplan
                )
 
        )
 
     )

 
I want to convert this array into this form

    /*Now, I want to simply it down to this*/
    Array (
	[0] =&gt; basic
	[1] =&gt; small
	[2] =&gt; novice
	[3] =&gt; professional
	[4] =&gt; master
	[5] =&gt; promo
	[6] =&gt; newplan
    )

Any idea how to do this? 

Convert multidimensional array into single array

I&#39;m trying to set the width of a cell in an Excel document generated with PHPExcel with:

    $objPHPExcel-&gt;getActiveSheet()-&gt;getColumnDimensionByColumn(&#39;C&#39;)-&gt;setWidth(&#39;10&#39;);
    $objPHPExcel-&gt;getActiveSheet()-&gt;getColumnDimensionByColumn(&#39;C&#39;)-&gt;setAutoSize(false);

but that does not works.

What is the method that I need to call here?

Setting width of spreadsheet cell using PHPExcel

I&#39;m trying to think of the best way to return an empty array, rather than `null`.

Is there any difference between `foo()` and `bar()`?

    private static File[] foo() {
        return Collections.emptyList().toArray(new File[0]);
    }

&lt;!-- separator --&gt;

    private static File[] bar() {
        return new File[0];
    }

Returning an empty array

What is a function in PHP used to convert array to string, other than using JSON?

I know there is a function that directly does like JSON. I just don&#39;t remember.

How to convert array to a string using methods other than JSON?

**Is it possible to map a NumPy array in place? If yes, how?**

Given `a_values` - 2D array - this is the bit of code that does the trick for me at the moment:

    for row in range(len(a_values)):
        for col in range(len(a_values[0])):
            a_values[row][col] = dim(a_values[row][col])

But it&#39;s so ugly that I suspect that somewhere within NumPy there must be a function that does the same with something looking like:

    a_values.map_in_place(dim)

but if something like the above exists, I&#39;ve been unable to find it.


Mapping a NumPy array in place

I want to do something like:

    var myArray = [&quot;one&quot;,&quot;two&quot;,&quot;three&quot;];
    document.write(myArray.splice(1,1));
    document.write(myArray);

So that it shows first &quot;one,three&quot;, and then &quot;one,two,three&quot;. I know splice() returns the removed element and changes the array, but is there function to return a new array with the element removed? I tried:

    window.mysplice = function(arr,index,howmany){
        arr.splice(index,howmany);
        return arr;   
    };

If I try:

    var myArray = [&quot;one&quot;,&quot;two&quot;,&quot;three&quot;];
    document.write(mySplice(myArray,1,1));
    document.write(myArray);

It still changes myArray.

Returning an array without a removed element? Using splice() without changing the array?

I&#39;m trying to remove all the spaces from a string derived from user input, but for some reason it isn&#39;t working for me. Here is my code.

	public void onClick(View src) {
		switch (src.getId()) {
			case R.id.buttonGo:
				String input = EditTextinput.getText().toString();
				input = String.replace(&quot; &quot;, &quot;&quot;);
				url = ur + input + l;
				Intent myIntent = new Intent(start.this, Main.class);
				myIntent.putExtra(&quot;URL&quot;, url);
				start.this.startActivity(myIntent);
				break;
			}
	}

Removing spaces from string

How can I, using Javascript, make a function that will trim string passed as argument, to a specified length, also passed as argument. For example:

    var string = &quot;this is a string&quot;;
    var length = 6;
    var trimmedString = trimFunction(length, string);
    
    // trimmedString should be:
    // &quot;this is&quot;

Anyone got ideas? I&#39;ve heard something about using substring, but didn&#39;t quite understand.

How to trim a string to N chars in Javascript?

I want to eliminate all the whitespace from a string, on both ends, and in between words.

This only eliminates the whitespace on both sides of the string:

    &gt;&gt;&gt; &quot;  hello  apple  &quot;.strip()
    &#39;hello  apple&#39;

How do I remove all whitespace?

Remove all whitespace in a string

I&#39;ve read [this question][1] about javascript trim, with a regex answer.

Then I expect trim to remove the *inner* space between Hello and World.  

    function myFunction() {
        alert(&quot;Hello World &quot;.trim());
    }


**EDITED**

**Why I expected that!?** 

Nonsense! Obviously trim doesn&#39;t remove inner spaces!, only leading and trailing ones, that&#39;s how trim works, then this was a very wrong question, my apologies.


  [1]: https://stackoverflow.com/questions/498970/how-do-i-trim-a-string-in-javascript

Remove whitespaces inside a string in javascript

What is a good alternative of JavaScript `ltrim()` and `rtrim()` functions in Java?


Content Type	Original Author	Original Content on Stackoverflow
Question	Daniel	View Question on Stackoverflow
Solution 1 - Php	zerkms	View Answer on Stackoverflow
Solution 2 - Php	KingCrunch	View Answer on Stackoverflow

How can I trim all strings in an Array?

Php Problem Overview

Php Solutions

Solution 1 - Php

Solution 2 - Php

Architecture for merging multiple user accounts together

What's the difference between `1L` and `1`?

Attributions