asort arsort diffrerences

Question: what is the difference between asort and arsort?

Answer:

asort - sorts an array. It maintains index values.

arsort- It sorts an array in reverse manner.

Example for asort:

<?php

$fruits = array("d" => "php", "a" => "interview", "b" => "questions", "c" => "answers");

asort($fruits);

foreach ($fruits as $key => $val) {

echo "$key = $val\n";

}

?>

The output is c = answers a = interview d = php b = questions

Example for arsort:

<?php

$fruits = array("d" => "php", "a" => "interview", "b" => "questions", "c" => "answers");

arsort($fruits);

foreach ($fruits as $key => $val) {

echo "$key = $val\n";

}

?>

The output is

b = questions d = php a = interview c = answers

stristr trick questions

What is output of the following

echo stristr('user@EXAMPLE.com', 'R'); //

echo stristr('user@EXAMPLE.com', 'r'); //

Output

r@EXAMPLE.com

r@EXAMPLE.com

The stristr is case insensitive.

strstr trick questions

What is output of the following

strstr("php@interview",'@');

strstr("php@interview",'@',true);

Answer

@interview

php

This is the mostly asked interview question

substr - related questions

What is substr in php?

substr is used to return a part of a string

Two arguments can be passed to the substr

1. start value

2. length value

Examples

1. start value

substr('interview',1); // returns "nterview"

substr('interview',-2); //returns "ew"

2. Length value

substr('interview',-2,1); //the output is "e"

substr('interview',-3,-2); //the output is "i"

substr('interview',1,2); //the out put is "nt"

Your comment always welcome

captcha in php

Question: What is captcha in php

Answer

Captcha is nothing but an image which contains numbers,characters with an distorted background

Acronym for captcha is

Completely Automated Public Turing test to tell Computers and Human Apart

Simply saying : It is a mechanism for protecting spams in an application.

Explain Static keyword in php

Answer

Declaring class members or methods as static makes them accessible without needing an instantiation of the class. A member declared as static can not be accessed with an instantiated class object (though a static method can).

what are the magic methods in php

Answer

__construct

__destruct

__call

__callStatic

__get

__set

__isset

__unset

__sleep

__wakeup

__toString

__invoke

__set_state

__clone

These are all the magic methods in php

what is magic constants in php

Answer

======

Magic constants change their value depending on where they used

Example:

=========

__line__

this will show the current line number.

There are seven magic constants in php

__LINE__

__FILE__
__DIR__
__FUNCTION__
__CLASS__
__METHOD__
__NAMESPACE__

Question:what is References in php

Question: what is References in php

Answer

Access the same variable content by different names

Example

---------

$x =& $y;

?>

Here the $x,$y point the same content