You can use [preg_replace][1] in this case;

    $res = preg_replace(&quot;/[^0-9]/&quot;, &quot;&quot;, &quot;Every 6 Months&quot; );

$res return 6 in this case.


If want also to include decimal separator or thousand separator check this example:

    $res = preg_replace(&quot;/[^0-9.]/&quot;, &quot;&quot;, &quot;$ 123.099&quot;);

$res returns &quot;123.099&quot; in this case

Include period as decimal separator or thousand separator: &quot;/[^0-9.]/&quot;

Include coma as decimal separator or thousand separator: &quot;/[^0-9,]/&quot;

Include period and coma as decimal separator and thousand separator: &quot;/[^0-9,.]/&quot;

[1]: http://php.net/manual/en/function.preg-replace.php

Use `\D` to match non-digit characters.

    preg_replace(&#39;~\D~&#39;, &#39;&#39;, $str);

Say I want a type variable, T, that extends a certain class and implements an interface. Something like:

    class Foo &lt;T : Bar implements Baz&gt; { ... }

What is the syntax for this in Kotlin?

Generic extending class AND implements interface in Kotlin

I&#39;ve noticed that a frequent occurrence during training is `NAN`s being introduced.

Often times it seems to be introduced by weights in inner-product/fully-connected or convolution layers blowing up.

Is this occurring because the gradient computation is blowing up? Or is it because of weight initialization (if so, why does weight initialization have this effect)? Or is it likely caused by the nature of the input data?

The overarching question here is simply: **What is the most common reason for NANs to occurring during training?** And secondly, what are some methods for combatting this (and why do they work)?

Common causes of nans during training of neural networks

What is the best way for me to do this? Should I use regex or is there another in-built PHP function I can use?

For example, I&#39;d want: `12 months` to become `12`. `Every 6 months` to become `6`, `1M` to become `1`, etc.


PHP - remove all non-numeric characters from a string

<p>What is the best way for me to do this? Should I use regex or is there another in-built PHP function I can use?</p>
<p>For example, I'd want: <code>12 months</code> to become <code>12</code>. <code>Every 6 months</code> to become <code>6</code>, <code>1M</code> to become <code>1</code>, etc.</p>


In Laravel 5.1 is there a nice way to check if an eloquent model object has been soft-deleted? I&#39;m not talking about selecting data but once I have the object e.g. `Thing::withTrashed()-&gt;find($id)`

So far the only way I can see is

    if ($thing-&gt;deleted_at !== null) { ... }

I do not see any relevant method [in the API][1] that would allow for example

    if ($thing-&gt;isDeleted()) { ... }


  [1]: http://laravel.com/api/5.1/Illuminate/Database/Eloquent/Model.html

How to check if row is soft-deleted in Eloquent?

I am using ``Laravel`` web framework on my ``ubuntu 14.04`` server and ``Nginx`` web server, I have this error when I try to upload a file using ``Laravel`` to the server.
my upload directory is on the ``public/uploads`` folder that has 777 permission.


GD Library extension not available with this PHP installation Ubuntu Nginx

My application currently passes data to my form type using the constructor, as recommended in [this answer][1]. However the [Symfony 2.8 upgrade guide][2] advises that passing a type instance to the `createForm` function is deprecated:

&gt; Passing type instances to Form::add(), FormBuilder::add() and the
&gt; FormFactory::create*() methods is deprecated and will not be supported
&gt; anymore in Symfony 3.0. Pass the fully-qualified class name of the
&gt; type instead.
&gt; 
&gt;     Before:    
&gt;     $form = $this-&gt;createForm(new MyType());
&gt; 
&gt;     After:
&gt;     $form = $this-&gt;createForm(MyType::class);

Seeing as I can&#39;t pass data through with the fully-qualified class name, is there an alternative?


  [1]: https://stackoverflow.com/a/7818709/526495
  [2]: https://github.com/symfony/symfony/blob/2.8/UPGRADE-2.8.md

Passing data to buildForm() in Symfony 2.8, 3.0 and above

From within the directory holding my composer.phar file, I can&#39;t execute any composer commands. 

I can see Composer is running when I execute
    
    php composer.phar 

But any direct composer statements fail. 

Not sure if it matters but Composer was included within a cloned repository.

I just want to install a single Oauth library, then likely not touch Composer again for several months, so I don&#39;t need to run it globally. I&#39;m just confused why I can&#39;t run Composer from within this directory.



Composer: Command Not Found

After I upgraded **php5** to **php7**, I get an error 500 with

&gt; PHP Fatal error:  Uncaught Error: Call to undefined function mysql_connect()

I put this into my apt sources in order to get php7 right now:

&gt; deb http://packages.dotdeb.org jessie all&lt;br /&gt;
&gt; deb-src http://packages.dotdeb.org jessie all

What I basically did is:

    apt-get remove php5
    apt-get install php7-*

*I&#39;m using the current version of Debian Jessie.*

But I still get this. There are a lot of questions here on SO and I definitely checked them all out. But I didn&#39;t find an answer there yet.

&quot;Call to undefined function mysql_connect()&quot; after upgrade to php-7

I am working on a problem out of CTCI.

The third problem of chapter 1 has you take a string such as 

`&#39;Mr John Smith    &#39;`

and asks you to replace the intermediary spaces with `%20`:

`&#39;Mr%20John%20Smith&#39;`

The author offers this solution in Python, calling it O(n):

    def urlify(string, length):
        &#39;&#39;&#39;function replaces single spaces with %20 and removes trailing spaces&#39;&#39;&#39;
        counter = 0
        output = &#39;&#39;
        for char in string:
            counter += 1
            if counter &gt; length:
                return output
            elif char == &#39; &#39;:
                output = output + &#39;%20&#39;
            elif char != &#39; &#39;:
                output = output + char
        return output


My question:

I understand that this is O(n) in terms of scanning through the actual string from left to right. But aren&#39;t strings in Python immutable? If I have a string and I add another string to it with the `+` operator, doesn&#39;t it allocate the necessary space, copy over the original, and then copy over the appending string?

If I have a collection of `n` strings each of length 1, then that takes:

`1 + 2 + 3 + 4 + 5 + ... + n = n(n+1)/2`

or **O(n^2) time**, yes? Or am I mistaken in how Python handles appending?

Alternatively, if you&#39;d be willing to teach me how to fish: How would I go about finding this out for myself? I&#39;ve been unsuccessful in my attempts to Google an official source. I found https://wiki.python.org/moin/TimeComplexity but this doesn&#39;t have anything on strings.

Is the time-complexity of iterative string append actually O(n^2), or O(n)?

Is it possible in Handlebars to check if a string is equal to another value without registering a helper? I can&#39;t seem to find anything relevant to this in the Handlebars reference.

For example:

    {{#if sampleString == &quot;This is a string&quot;}}
    ...do something
    {{/if}}

Handlebarsjs check if a string is equal to a value

I was trying to [fiddle][1] with [`toLocaleLowerCase()`][2] and [`toLowerCase()`][3] methods.

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-js --&gt;

function ByLocale() {
  document.getElementById(&quot;demo&quot;).innerText.toLocaleLowerCase();
}

function ByLower() {
  document.getElementById(&quot;demo&quot;).innerText.toLowerCase();
}

&lt;!-- language: lang-html --&gt;

&lt;p&gt;Click the button to convert the string &quot;HELLO World!&quot; to lowercase letters.&lt;/p&gt;

  &lt;button onclick=&quot;ByLocale();&quot;&gt;By Locale LowerCase&lt;/button&gt;
  &lt;button onclick=&quot;ByLower();&quot;&gt;By LowerCase&lt;/button&gt;

&lt;p id=&quot;demo&quot;&gt;HELLO World!&lt;/p&gt;

&lt;!-- end snippet --&gt;

My questions are:

 - What is **Locale**, because both the functions seems to return similar output?
 - What is the difference between these two methods?
 - Why is the fiddle code not getting executed?

  [1]: http://jsfiddle.net/xameeramir/kr33b0aL/
  [2]: http://www.w3schools.com/jsref/jsref_tolocalelowercase.asp
  [3]: http://www.w3schools.com/jsref/jsref_tolowercase.asp

Difference between toLocaleLowerCase() and toLowerCase()

I was trying to remove unwanted characters from a given string using `text.translate()` in Python 3.4.

The minimal code is:

	import sys 
	s = &#39;abcde12345@#@$#%$&#39;
	mapper = dict.fromkeys(i for i in range(sys.maxunicode) if chr(i) in &#39;@#$&#39;)
	print(s.translate(mapper))

It works as expected. However the same program when executed in Python 3.4 and Python 3.5 gives a large difference.

The code to calculate timings is

	python3 -m timeit -s &quot;import sys;s = &#39;abcde12345@#@$#%$&#39;*1000 ; mapper = dict.fromkeys(i for i in range(sys.maxunicode) if chr(i) in &#39;@#$&#39;); &quot;   &quot;s.translate(mapper)&quot;

The Python 3.4 program takes ***1.3ms*** whereas the same program in Python 3.5 takes only ***26.4μs***. 

What has improved in Python 3.5 that makes it faster compared to Python 3.4?

Why is str.translate much faster in Python 3.5 compared to Python 3.4?

I have some strings to be concatenated and the resultant string will be quite long. I also have some variables to be concatenated.

How can I combine both strings and variables so the result would be a multiline string?

The following code throws error.

    str = &quot;This is a line&quot; +
           str1 +
           &quot;This is line 2&quot; +
           str2 +
           &quot;This is line 3&quot; ;

I have tried this too

    str = &quot;This is a line&quot; \
          str1 \
          &quot;This is line 2&quot; \
          str2 \
          &quot;This is line 3&quot; ;

Please suggest a way to do this.

Content Type	Original Author	Original Content on Stackoverflow
Question	b85411	View Question on Stackoverflow
Solution 1 - Php	pguetschow	View Answer on Stackoverflow
Solution 2 - Php	Avinash Raj	View Answer on Stackoverflow

PHP - remove all non-numeric characters from a string

Php Problem Overview

Php Solutions

Solution 1 - Php

Solution 2 - Php

Common causes of nans during training of neural networks

Generic extending class AND implements interface in Kotlin

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