difference between ksort and asort in php

Interview Question:

What is the difference between ksort and asort in php?

Answer:

ksort - sorts an array by its key

asort - sorts an array by its value

Example.

<?php

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

ksort($resource);

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

echo "$key = $val\n";

}

?>

The sample output is

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

question about array sorts in php

Question: What are all the array sorts in php?

Answer: The following are the array sort functions

sort()

asort()

arsort()

krsort()

usort()

ksort()

natcasesort()

rsort()

shuffle()

array_multisort()

uasort()

uksort()

natsort()

extract domain name from the url using regular expression

Question: How to extract domain name from a url using regular expressions

Answer:

preg_match('@^(?:http://)?([^/]+)@i',"http://blogger.com", $matches);

$host = $matches[1];

// get last two segments of host name

preg_match('/[^.]+\.[^.]+$/', $host, $matches);

echo "domain name is: {$matches[0]}\n";

The output is

domain name is: blogger.com

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