Need php code for 1) Create a function that checks if an integer n is a prime (r

Question

Need php code for

1)      Create a function that checks if an integer n is a prime (returns true if the integer is prime and false otherwise). In the body of your page create a loop that uses this function to check and display all primes in a range from 1 to 100.

2)      Create a function GeneratePassword which accepts two arguments, an integer and a character string consisting of letters (a-z) and digits (0-9).

When GeneratePassword(5,'abc0123') is called, it should return a random string of 5 characters taken from 'abc0123'. For Example : GeneratePassword(7,'abczxc012394') could return any of the following outputs : 2c00acb 2c23z93 030b2a4

In the body of your page generate three different calls to this function using a different numeric value and text string and display the results.

Explanation / Answer

<?php

function isPrime($num)

{

if($num == 1)

return false;

if($num == 2)

return true;

if($num % 2 == 0)//all the cases multiple of two excluded here now we have to check only odd numbers

return false;

//after ceil(sqrt($num) the numbers started to multiple of lesser number than ceil(sqrt($num). So just check till ceil(sqrt($num) will be fine and take less time.

for($i = 3; $i <= ceil(sqrt($num)); $i = $i + 2)

{

if($num % $i == 0)

return false;

}

return true;

}

function GeneratePassword($n,$domain)

{

$len = strlen($domain);

$pass = str_repeat("",$n);

for($i=0;$i<$n;$i++)

{

$randomPassChar = $domain[rand(0, $len-1)];

$pass[$i]=$randomPassChar;

}

return $pass;

}

//for web page

echo "Prime number exist between 1 to 100<br/>";

for($i=1;$i<=100;$i++)

{

if(isPrime($i))

{

echo $i." is prime<br/>";

}

}

//for pass generator

echo "password generated of length 5 from 'abc123' : ".GeneratePassword(5,"abc123")."<br/>";

echo "password generated of length 7 from 'xyzabc123' : ".GeneratePassword(7,"xyzabc123")."<br/>";

echo "password generated of length 9 from 'abcdef789' : ".GeneratePassword(9,"abcdef789")."<br/>";

echo "password generated of length 5 from '12345xyz' : ".GeneratePassword(5,"12345xyz")."<br/>";

?>

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