PHP, MySQL, Drupal, .htaccess, Robots.txt, Phponwebsites: August 2015

# Find prime numbers between 1 and 100 in PHP

This blog describes how to find prime numbers between 1 and 100 using PHP. Prime number is a number which is divided by 1 and itself.  Consider the number 5. It is prime number because it can be divided by 1 and 5.

### PHP program for prime numbers:

Consider the below program which is used to find prime numbers from 1 to 100.

<?php
for(\$i = 1; \$i <= 100; \$i++)
\$mm = 0;
for(\$j = 2; \$j <= \$i/2; \$j++) {
//only not prime numbers
if (\$i % \$j == 0) {
\$mm++;
break;
}
}
if (\$mm == 0) {
echo"\$i is prime number<br/>";
}
}
?>

In above program, if a number is divided by any number except 1 and itself, then it is not prime number. Otherwise it is a prime number.

Now you got prime numbers between 1 and 100 using PHP.
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# Find Armstrong Numbers between 1 to 1000 in PHP

This blog describes how to find Armstrong Numbers between 1 to 1000 using PHP?. Before we are going to program part, we should know what is Armstrong Number?. So only we can write program for find Armstrong Number in any languages like C, C++, PHP.

### what is Armstrong Number?

Armstrong Number is sum of 3 power of each digits equals to given number.
For example:
153 is Armstrong Number.
1^3 + 5^3 + 3 ^3
1 + 125 + 27
153

### PHP Program to find Armstrong Numbers:

Consider below example which is find Armstrong Numbers between 1 to 1000.

<?php
for(\$i = 1; \$i <= 1000; \$i++) {
\$sum = 0;
\$qu = \$i;
while(\$qu != 0) {
\$remainder = \$qu % 10;
\$thrice = \$remainder * \$remainder * \$remainder;
\$sum += \$thrice;
\$qu = \$qu / 10;
}
if (\$sum == \$i) {
echo "<p>\$i is armstrong number</p>";
}
}
?>

Now you got Armstrong Numbers between 1 to 1000.

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# Get value from drop down box using PHP

The drop down box allows you to select one or more values from it. The HTML tag "select" is also known as "drop down" or "pul down" box.You can get value from drop down box using PHP while form submitting.

### HTML form with drop down box

The below example describes how to create HTML form with drop down box.

<html>
<body>
<form action="#" method="post">
<select name="country">
<option value="USA">USA</option>
<option value="United Kingdom">United Kingdom</option>
<option value="France">France</option>
<option value="Russia">Russia</option>
<option value="India">India</option>
</select>
<input type="submit" name="submit" value="Submit">
</form>
</body>
</html>

### Retrieve input data from drop down box using PHP

You can retrieve input data from drop down box using following types in PHP.
\$_POST['drop_down_name'] (if method is post)
\$_GET['drop_down_name'] (if method is gett)
\$_REQUEST['drop_down_name'] (if method is either post or get)
The following PHP script describes how to retrieve input data from drop down box while form submitting.

<html>
<body>
<form action="#" method="post">
<select name="country">
<option value="USA">USA</option>
<option value="United Kingdom">United Kingdom</option>
<option value="France">France</option>
<option value="Russia">Russia</option>
<option value="India">India</option>
</select>
<input type="submit" name="submit" value="Submit">
</form>
<?php
if(isset(\$_POST['submit']))
{
\$country=\$_POST['country'];
echo'You selected '.\$country;
}
?>
</body>
</html>

While submitting form with select country from drop down box, you can get selected country as output.

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