Let&#39;s read [the docs][1]:

&gt; The following table lists the operators in order of precedence, with the highest-precedence ones at the top.[...]

    Associativity      Operators       Additional Information
    ================== =============== ======================
    non-associative    instanceof      types
    right              !               logical

So `instanceof` has higher priority, thus both statements are equivalent. Parenthesis are probably used to make it obvious so you don&#39;t need to look it up in the documentation.

  [1]: http://php.net/manual/en/language.operators.precedence.php

&gt; Are they equivalent?

Yes, logically they are equivalent. [The answer][1] by **&#193;lvaro G. Vicario** provides more detail *why*.

&gt; Which is the correct format for negating instance of?

Of the two, there is an argument that the following is more readable. But there is no single *way*. That&#39;s the beauty and curse of PHP.

    !($a instanceof stdClass)


  [1]: https://stackoverflow.com/a/14362690/164998

Is there an easy way to export a data frame (or even a part of it) to LaTeX?  

*I searched in google and was only able to find solutions using asciitables.*

Export a LaTeX table from pandas DataFrame

I used this Xpath expression `&quot;//span[@class=&#39;Big&#39;]&quot;` and got all elements in that page that are under `&lt;span&gt;` tag and `class=&#39;Big&#39;`.

My question is what if I want just the first occurrence on the page, not all occurrences, what would be the correct `Xpath` expression?

Thanks,
Narin

What is the XPath expression to find only the first occurrence?

Which is the correct format for negating instanceof?

    if ( ! $a instanceof stdClass)

or



   
    if ( ! ($a instanceof stdClass) ) 

I&#39;ve convinced myself the latter is correct way, probably after reading a blog article several years ago, but after some command-line tests, they both seem equivalent. *Are* they?

instanceof negation

Which is the correct format for negating instanceof?
<pre><code class="hljs language-php">if ( ! $a instanceof stdClass)
</code></pre>
or
<pre><code class="hljs language-php">if ( ! ($a instanceof stdClass) ) 
</code></pre>
I've convinced myself the latter is correct way, probably after reading a blog article several years ago, but after some command-line tests, they both seem equivalent. Are they?

I&#39;ve found an error on a page in my Magento application; it always show this message error when I visit it:

&gt; Fatal error: Class &#39;DOMDocument&#39; not found in /home/.../lib/Zend/Feed/Abstract.php on line 95

Can you give me a solution? I&#39;m using magento 1.4.1.1.


Class &#39;DOMDocument&#39; not found

In JavaScript, you can easiliy create an object without a class by:

     myObj = {};
     myObj.abc = &quot;aaaa&quot;;

For PHP I&#39;ve found this one, but it is nearly 4 years old:
http://www.subclosure.com/php-creating-anonymous-objects-on-the-fly.html

    $obj = (object) array(&#39;foo&#39; =&gt; &#39;bar&#39;, &#39;property&#39; =&gt; &#39;value&#39;);

Now with PHP 5.4 in 2013, is there an alternative to this?

php create object without class

I understand PHP does not have a pure object variable, but I want to check whether a property is in the given object or class.

    $ob = (object) array(&#39;a&#39; =&gt; 1, &#39;b&#39; =&gt; 12); 

or

    $ob = new stdClass;
    $ob-&gt;a = 1;
    $ob-&gt;b = 2;

In **JS,** I can write this to check if variable `a` exists in an object:

    if (&#39;a&#39; in ob)

In **PHP,** can anything like this be done?

PHP check whether property exists in object or class

So I&#39;m using a PHP framework called **fuelphp**, and I have this page that is an **HTML** file, so I can&#39;t use PHP in it. I have another file that has a top bar in it, which my HTML file will call through ajax.  

How do I check if a constant exists in PHP?  
I want to check for the the fuelphp framework file locations.


These are the constants I need to check for (actually, I only have to check one of them):

	

    define(&#39;DOCROOT&#39;, __DIR__.DIRECTORY_SEPARATOR);
    	define(&#39;APPPATH&#39;, realpath(__DIR__.&#39;/fuel/app/&#39;).DIRECTORY_SEPARATOR);
    	define(&#39;PKGPATH&#39;, realpath(__DIR__.&#39;/fuel/packages/&#39;).DIRECTORY_SEPARATOR);
    	define(&#39;COREPATH&#39;, realpath(__DIR__.&#39;/fuel/core/&#39;).DIRECTORY_SEPARATOR);					
    	require APPPATH.&#39;bootstrap.php&#39;;

**edit:**&lt;br /&gt;
I realized that these aren&#39;t variables they are constants...

How to check if a defined constant exists in PHP?

I have to make a PATCH request using PhP cURL. I couldn&#39;t find any documentation, so I tried the following but it isn&#39;t working.
 
    $data = &quot;{&#39;field_name&#39;: &#39;field_value&#39;}&quot;;
    $url = &quot;http://webservice.url&quot;;
    $headers = array(&#39;X-HTTP-Method-Override: PATCH&#39;);
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
    $response = curl_exec($curl);
    curl_close($curl);
 
Any idea why this isn&#39;t working? How can I fix it?

**Edit:**
I am connecting to a RESTful web service. It returns HTTP/1.1 200 for successful requests. Unsuccessful requests return HTTP/1.1 403. I keep getting 403.

I tried changing $data to:
 
    $data = &quot;data={&#39;field_name&#39;: &#39;field_value&#39;}&quot;;
It didn&#39;t change the outcome. 

**Edit2:**
The final working code.
 

    $data = &quot;{&#39;field_name&#39;: &#39;field_value&#39;}&quot;;
    $url = &quot;http://webservice.url&quot;;
    $headers = array(&#39;Content-Type: application/json&#39;);
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_CUSTOMREQUEST, &#39;PATCH&#39;);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
    $response = curl_exec($curl);
    curl_close($curl);


How do I make a PATCH request in PHP using cURL?

For this example:

    public class Foo{}
    
    public class Bar extends Foo{}

    ....

    void myMethod(Foo qux){
       if (checkInstance(qux,Foo.class)){
         ....
       }
    }

How can I check if `qux` is an instance of Foo (but not an instance of its subclass of foo)? That is:

 - checkInstance(qux,Foo.class)=true
 - checkInstance(qux,Bar.class)=false

Is there some kind of statement like `instanceof` for this check? or I should use `qux.getClass().equals(Foo.class)`


Check if an object is an instance of a class (but not an instance of its subclass)

In JavaScript, I can declare a string in the following ways;

    var a = &quot;Hello World&quot;;
    var b = new String(&quot;Hello World&quot;);

but a is not an instance of String...

    console.log(a instanceof String); //false;
    console.log(b instanceof String); //true;

So how do you find the type or &quot;`instanceof`&quot; a string literal?

Can JavaScript be forced to create a `new String()` for every string literal?

How to &quot;instanceof&quot; a primitive string (string literal) in JavaScript

I would like to know regarding following behavior of `instanceof` operator in Java.

    interface C {}

    class B {}

    public class A {
        public static void main(String args[]) {
            B obj = new B();
            System.out.println(obj instanceof A);      //Gives compiler error
            System.out.println(obj instanceof C);      //Gives false as output
        }
    }

Why is it so? There is no relation between `interface C` and `class B`, but it gives false whereas in case of `obj instanceof A` it gives compiler error?


The &#39;instanceof&#39; operator behaves differently for interfaces and classes

I have the following expression:

    scheduleIntervalContainers.stream()
            .filter(sic -&gt; ((ScheduleIntervalContainer) sic).getStartTime() != ((ScheduleIntervalContainer)sic).getEndTime())
            .collect(Collectors.toList());

...where `scheduleIntervalContainers` has element type `ScheduleContainer`:

    final List&lt;ScheduleContainer&gt; scheduleIntervalContainers

Is it possible to check the type before the filter?

Check instanceof in stream

How can I find the variable type in Kotlin?
In Java there is `instanceof`, but Kotlin does not exist:

    val properties = System.getProperties() // Which type?

Content Type	Original Author	Original Content on Stackoverflow
Question	Mathew	View Question on Stackoverflow
Solution 1 - Php	Álvaro González	View Answer on Stackoverflow
Solution 2 - Php	Jason McCreary	View Answer on Stackoverflow

instanceof negation

Php Problem Overview

Php Solutions

Solution 1 - Php

Solution 2 - Php

What is the XPath expression to find only the first occurrence?

Export a LaTeX table from pandas DataFrame

Attributions