If you are just looking for an online site to play around with PHP code, try 

- http://phpfiddle.org/
- http://ideone.com/
- https://codeanywhere.net/
- http://www.tehplayground.com/
- http://sandbox.onlinephpfunctions.com/
- http://codepad.org/
- https://eval.in/
- https://implode.io/ (permits attaching a version of the Laravel framework)

The most sophisticated is:

- http://3v4l.org/

It lets you test your code in all PHP versions starting from PHP4.

If you want something for your local environment, the [Runkit extension][1] aims to provide a PHP Sandbox:

&gt; Instantiating the Runkit_Sandbox class creates a new thread with its own scope and program stack. Using a set of options passed to the constructor, this environment may be restricted to a subset of what the primary interpreter can do and provide a safer environment for executing user supplied code. 

If you dont want to use Runkit but still want a PHP Console on your server, try

- [Jordi Boggiano&#39;s Blog - PHP Console in Your Browser][2]
- http://github.com/seldaek/php-console



  [1]: http://php.net/manual/en/runkit.sandbox.php
  [2]: http://seld.be/notes/php-console-in-your-browser

I would like to show a div when someone hovers over an `&lt;a&gt;` element, but I would like to do this in CSS and not JavaScript. Do you know how this can be achieved?

Using only CSS, show div on hover over another element

I sometimes want to match whitespace but not newline.

So far I&#39;ve been resorting to `[ \t]`.  Is there a less awkward way?

Match whitespace but not newlines

Is there a PHP Sandbox, something like JSFiddle is to JS?

<p>Is there a PHP Sandbox, something like JSFiddle is to JS?</p>


I have a MySQL statement that inserts some variables into the database. I recently added 2 fields which are optional ($intLat, $intLng).  Right now, if these values are not entered I pass along an empty string as a value.  How do I pass an explicit NULL value to MySQL (if empty)?

    $query = &quot;INSERT INTO data (notes, id, filesUploaded, lat, lng, intLat, intLng)
              VALUES (&#39;$notes&#39;, &#39;$id&#39;, TRIM(&#39;$imageUploaded&#39;), &#39;$lat&#39;, &#39;$long&#39;, 
                      &#39;$intLat&#39;, &#39;$intLng&#39;)&quot;;
    mysql_query($query);



MySQL and PHP - insert NULL rather than empty string

**Problem**  
I have a form that, when submitted, will run basic code to process the information submitted and insert it into a database for display on a notification website. In addition, I have a list of people who have signed up to receive these notifications via email and SMS message. This list is trivial as the moment (only pushing about 150), however it&#39;s enough to cause it takes upwards of a minute to cycle through the entire table of subscribers and send out 150+ emails. (The emails are being sent individually as requested by the system administrators of our email server because of mass email policies.) 

During this time, the individual who posted the alert will sit on the last page of the form for almost a minute without any positive reinforcement that their notification is being posted. This leads to other potential problems, all that have possible solutions that I feel are less than ideal.

 1. First, the poster might think the server is lagging and click the &#39;Submit&#39; button again, causing the script to start over or run twice. I could solve this by using JavaScript to disable the button and replace the text to say something like &#39;Processing...&#39;, however this is less than ideal because the user will still be stuck on the page for the length of the script execution. (Also, if JavaScript is disabled, this problem still exists.)

 2. Second, the poster might close the tab or the browser prematurely after submitting the form. The script will keeping running on the server until it tries to write back to the browser, however if the user then browses to any page within our domain (while the script is still running), the browser hangs loading the page until the script has ended. (This only happens when a tab or window of the browser is closed and not the entire browser application.) Still, this is less than ideal.

**(Possible) Solution**  
I&#39;ve decided I want to break out the &quot;email&quot; part of the script into a separate file I can call after the notification has been posted. I originally thought of putting this on the confirmation page after the notification has been successfully posted. However, the user will not know this script is running and any anomalies will not be apparent to them; This script cannot fail.

But, what if I can run this script as a background process? So, my question is this: How can I execute a PHP script to trigger as a background service and run completely independent of what the user has done at the form level?

**EDIT:** This *cannot* be cron&#39;ed. It must run the instant the form is submitted. These are high-priority notifications. In addition, the system administrators running our servers disallow crons from running any more frequently than 5 minutes.

How can I run a PHP script in the background after a form is submitted?

I&#39;ve been having some trouble with regular expressions.

This is my code 

    $pattern = &quot;^([0-9]+)$&quot;;

    if (preg_match($pattern, $input))
       echo &quot;yes&quot;;
    else
       echo &quot;nope&quot;;

I run it and get:

&gt; Warning: preg_match() [function.preg-match]: No ending delimiter &#39;^&#39; found in 

PHP regular expressions: No ending delimiter &#39;^&#39; found in

    // Other variables
    $MAX_FILENAME_LENGTH = 260;
    $file_name = $_FILES[$upload_name][&#39;name&#39;];
    //echo &quot;testing-&quot;.$file_name.&quot;&lt;br&gt;&quot;;
    //$file_name = strtolower($file_name);
    $file_extension = end(explode(&#39;.&#39;, $file_name)); //ERROR ON THIS LINE
    $uploadErrors = array(
        0=&gt;&#39;There is no error, the file uploaded with success&#39;,
        1=&gt;&#39;The uploaded file exceeds the upload max filesize allowed.&#39;,
        2=&gt;&#39;The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form&#39;,
        3=&gt;&#39;The uploaded file was only partially uploaded&#39;,
        4=&gt;&#39;No file was uploaded&#39;,
        6=&gt;&#39;Missing a temporary folder&#39;
    );

Any ideas? After 2 days still stuck.


Only variables should be passed by reference

I have a input string like:

    $str = &#39;:this is a applepie :) &#39;;

How can I remove the first occurring `:` with PHP?

Desired output: `this is a applepie :) `

How to remove the leading character from a string?

How can you run GUI applications in a Linux [Docker][1] container?

Are there any images that set up `vncserver` or something so that you can - for example - add an extra speedbump sandbox around say Firefox?


  [1]: http://www.docker.io

Can you run GUI applications in a Linux Docker container?

I would like to have the ability to let users submit arbitrary JavaScript code, which is then sent to a Node.JS server and safely executed before the output is sent back to multiple clients (as JSON). The `eval` function comes to mind, but I know this has multiple security concerns (the user submitted code would be able to access Node&#39;s File API, etc). I have seen some projects like Microsoft Web Sandbox and Google Caja which allow execution of sanitized markup and script (for embedding third-party ads on websites), but it seems that these are client-side tools and I&#39;m not sure if they can be safely used within Node.

Is there a standard way to sandbox and execute non-trusted JavaScript in Node, getting the output. Is it a mistake to try and do this server-side?

**EDIT:** It&#39;s not important that the user be able to leverage the full capabilities of JavaScript, in fact it would be preferable to be able to pick and choose which APIs would be provided to the user code.

**EDIT:** I am going to go ahead and update with what I found. This Sandcastle module ([**`bcoe/sandcastle`**](https://github.com/bcoe/sandcastle)) seems to aim to do what I have in mind. Not sure how secure it is, but since I this is not for anything too important I think I&#39;ll if try it. I&#39;ll add my own answer if I&#39;m able to successfully do this.

Safely sandbox and execute user submitted JavaScript?

I&#39;m developing a google chrome **packaged** app, when I put Sandbox in the `manifest.json`:

     {
      &quot;manifest_version&quot;: 2,
      &quot;name&quot;: &quot;WM32216&quot;,
      &quot;version&quot;: &quot;2.1&quot;,
      &quot;minimum_chrome_version&quot;: &quot;23&quot;,
      &quot;permissions&quot;:[&quot;webview&quot;, &quot;https://ajax.googleapis.com/*&quot;],
      &quot;sandbox&quot;:{
          &quot;pages&quot;:[&quot;index.html&quot;]
      },
      &quot;app&quot;: {
        &quot;background&quot;: {
          &quot;scripts&quot;: [&quot;main.js&quot;]
        }
      }
    }

An `onclick` event on my anchor tag works, and the flow of the app is complete EXCEPT THAT, icons from a CSS stylesheet don&#39;t load.

I got an `error` from the console that 

`File not found` ,

but those are just **fonts** so it&#39;s fine with me, 

The big problem is that, the video in the iframe doesn&#39;t play and I got additional error prior to the Font which are: 

&gt; VIDEOJS: ERROR: (CODE:4 MEDIA_ERR_SRC_NOT_SUPPORTED) The media could not be loaded, either because the server or network failed or because the format is not supported. 
&gt;
&gt; Not allowed to load local resource: blob:null/b818b32c-b762-4bd9-...
 
When I remove the sandbox in the manifest.json file, everything is good no errors in the console about the font, 

BUT when I **hit/click my anchor tag** that has a click event to load a new function in the js  I&#39;m getting the following **Console Error** :

&gt; Refused to execute inline event handler because it violates the following Content Security Policy directive: &quot;default-src &#39;self&#39; blob: filesystem: chrome-extension-resource:&quot;. Either the &#39;unsafe-inline&#39; keyword, a hash (&#39;sha256-...&#39;), or a nonce (&#39;nonce-...&#39;) is required to enable inline execution. Note also that &#39;script-src&#39; was not explicitly set, so &#39;default-src&#39; is used as a fallback.


Sorry for the very long detail,

I just need help with this because I&#39;m stuck here for 3 days already.

Refused to execute inline event handler because it violates CSP. (SANDBOX)

I have an app in the App Store and I want to test in-app purchases. I followed the steps described on the [Apple website][1] but I&#39;m facing some problems.

When I try to log in in the iTunes in my application or in Settings/iTunes &amp; App Stores, I receive the error:

&gt; **iTunes account creation not allowed.**
&gt;
&gt; This Apple ID cannot be used with the iTunes Store at this time. Please try again later

I searched the internet but I found nothing about this. It seems like I am the first to encounter this kind of error.

[![itunes account creation not allowed][2]][2]


  [1]: https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnectInAppPurchase_Guide/Chapters/TestingInAppPurchases.html
  [2]: http://i.stack.imgur.com/kqrco.jpg

Content Type	Original Author	Original Content on Stackoverflow
Question	Jiew Meng	View Question on Stackoverflow
Solution 1 - Php	Gordon	View Answer on Stackoverflow

Is there a PHP Sandbox, something like JSFiddle is to JS?

Php Problem Overview

Php Solutions

Solution 1 - Php

Match whitespace but not newlines

Using only CSS, show div on hover over another element

Attributions