Yes, you can get the function&#39;s name with the magic constant [`__FUNCTION__`][1]

    class foo
    {
      function print_func()
      {
                echo __FUNCTION__;
      }
      function print_method()
      {
                echo __METHOD__;
      }
    }

    $obj = new foo();
    $obj-&gt;print_func();      // Returns: print_func
    $obj-&gt;print_method();    // Returns: foo::print_method

  [1]: http://www.php.net/manual/en/language.constants.predefined.php

Maybe via debug_backtrace http://www.php.net/manual/en/function.debug-backtrace.php

I&#39;ve started learning Prolog and wondering about the theoretical difference from the SQL language. 

For example:

* both are declarative languages
* both support a fact-driven knowledge database
* both support question-styled data-retrieving
* both support functional dependencies

Any more common points? Any notable differences?

Comparing SQL and Prolog

I have an error being thrown by *SQL Server Management Studio* when running this code:

    declare @percentage numeric(3,2)
    set @percentage = cast(15 as numeric(3,2))

but when I change numeric declaration to 

    declare @percentage numeric(4,2)
    set @percentage = cast(15 as numeric(4,2))

everything goes fine.

Is there a limitation for numeric data type?


Why SQL Server throws Arithmetic overflow error converting int to data type numeric?

Is there a function that can return the name of the current function a program is executing?



Retrieving the name of the current function in PHP

<p>Is there a function that can return the name of the current function a program is executing?</p>


I was going through [Questions every good .Net developer should be able to answer][1] and was highly impressed with the content and approach of this question and so in the same spirit, I am asking this question for PHP Developer.


**What questions** do you think should a good **PHP programmer be able to respond to?**

**EDIT** : I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. 

Looking forward for some amazing responses. 

**NOTE** : Please answer questions too as suggested in the comments so that people could learn something new too regarding the language. 


  [1]: https://stackoverflow.com/questions/365489/questions-every-good-net-developer-should-be-able-to-answer

Questions every good PHP Developer should be able to answer

Take a look at this code:

    $GET = array();    
    $key = &#39;one=1&#39;;
    $rule = explode(&#39;=&#39;, $key);
    /* array_push($GET, $rule[0] =&gt; $rule[1]); */

I&#39;m looking for something like this so that:

    print_r($GET);
    /* output: $GET[one =&gt; 1, two =&gt; 2, ...] */

Is there a function to do this? (because `array_push` won&#39;t work this way)

How to push both value and key into PHP array

The lightbulb has yet to go on for this... 

I&#39;d really love an easy to understand explanation of the advantage to using a class in php over just using functions.  

Here&#39;s a simple example of the thought I&#39;m having now and am wondering if a class is more efficient:

Say I have a mini calendar widget that I&#39;ve built in php. I&#39;m thinking about calling the function `miniCal(&#39;arrayVars1&#39;, &#39;var2&#39;)`. But I might do it twice on that page.  Do use fewer resources by using a class here, create new instances of it?

What tree should I be barking up here, because I feel like right now the tree is a brick wall...

When to use a Class vs. Function in PHP

I am currently trying to add a progress bar to a command line script and I&#39;ve tried various solutions (including Zend and Console_ProgressBar). The problem they both have in common is that the progress bar doesn&#39;t stick at the bottom of the window because during the script, new lines and other information is outputted.

Is there any way to keep the progress bar at the bottom of the terminal but still be able to output other information while the script is running?

[Edit]

I figured it out:

Instead of outputting directly to STDOUT I am actually grabbing the output inside a variable, I erase the screen with `echo chr(27) . &#39;[2J&#39;` and then output to STDOUT the contents of the variable and then append my progress bar.

Hope that makes sense :)

Command line progress bar in PHP

What does the double *not* operator do in PHP?

For example:

    return !! $row;

What would the code above do?



Double not (!!) operator in PHP

Let&#39;s say I have `var a = function() { return 1; }`. Is it possible to alter `a` so that `a()` returns `2`? Perhaps by editing a property of the `a` object, since [every function is an object][1]?

**Update:** Wow, thanks for all the responses. However, I&#39;m afraid I wasn&#39;t looking to simply reassign a variable but actually edit an existing function. I am thinking along the lines of how you can combine [partial functions][2] in Scala to create a new `PartialFunction`. I am interested in writing something similar in Javascript and was thinking that the existing function could perhaps be updated, rather than creating an entirely new `Function` object.


  [1]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Function
  [2]: http://www.scala-lang.org/docu/files/api/scala/PartialFunction.html

Can you alter a Javascript function after declaring it?

Is there a way to allow &quot;unlimited&quot; vars for a function in JavaScript?

Example:

    load(var1, var2, var3, var4, var5, etc...)
    load(var1)


JavaScript variable number of arguments to function

I am trying to change the color of the function swapFE() below and I can&#39;t figure out how to write it. I was told to change the color of the phrase node to the color value (155, 102, 102). I tried to do that as you can see at the end of the function see- parent.childNodes[1].style.color= (155, 102, 102); but it just comes out a dark navy blue. It&#39;s supposed to be a brownish red. I have no idea what I&#39;m doing wrong. How can I fix this to get the correct RGB color? I know I have the rest right it&#39;s just figuring out how to write the color and the value that&#39;s giving me problems. Thanks!

    //this function changes the French phrase to an English phrase. 
        function swapFE(e) { 
               var phrase = e.srcElement;  
               //phrase.innerText = english[phrase.id]; 
               var parent = phrase.parentNode; 
               //childNodes[0] is the number of the phrase +1  
               var idnum = parent.childNodes[0]; 
               //parseInt takes a textstring and extracts it to make a number. Then you will subtract 1 from the number. 
     
           var phrasenum = parseInt(idnum.innerHTML)-1; 
           phrase.innerText = english[phrasenum]; 
           parent.childNodes[1].style.fontStyle= &quot;normal&quot;; 
           parent.childNodes[1].style.color= (155, 102, 102); 
      } 
     
     
    function swapEF(e) { 
           var phrase = e.srcElement;  
           //phrase.innerText = english[phrase.id]; 
           var parent = phrase.parentNode; 
           var idnum = parent.childNodes[0]; 
           var phrasenum = parseInt(idnum.innerHTML)-1; 
           phrase.innerText = french[phrasenum]; 
           parent.childNodes[1].style.fontStyle= &quot;italic&quot;; 
           parent.childNodes[1].style.color= &quot;black&quot;; 



How do I write a RGB color value in JavaScript?

Code will explain more:

    $var = 0;

    if (!empty($var)){
	echo &quot;Its not empty&quot;;
    } else {
	echo &quot;Its empty&quot;;
    }

The result returns &quot;Its empty&quot;. I thought empty() will check if I already set the variable and have value inside. Why it returns &quot;Its empty&quot;??

Content Type	Original Author	Original Content on Stackoverflow
Question	Cian E	View Question on Stackoverflow
Solution 1 - Php	Sarfraz	View Answer on Stackoverflow
Solution 2 - Php	robertbasic	View Answer on Stackoverflow

Retrieving the name of the current function in PHP

Php Problem Overview

Php Solutions

Solution 1 - Php

Solution 2 - Php

Why SQL Server throws Arithmetic overflow error converting int to data type numeric?

Comparing SQL and Prolog

Attributions