PHP program to list prime numbers

Here is the Program to list the first 15 prime numbers.

<?php
$count = 0;
$num = 2;

while ($count < 15 )

{

$div_count=0;

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

{

if (($num%$i)==0)

{

$div_count++;

}

}

if ($div_count<3)

{

echo $num." , ";

$count=$count+1;

}

$num=$num+1;

}
?>

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PHP program that multiplies corresponding elements of two given lists

<?php function multiply_two_lists($x, $y) { $a = explode(' ',trim($x)); $b = explode(' ',trim($y)); foreach($a as $key=>$value) { $output[$key] = $a[$key]*$b[$key]; } return implode(' ',$output); } echo multiply_two_lists(("10 12 3"), ("1 3 3"))."\n"; ?>

Temperature Calculator using PHP

This is a PHP script to calculate and display average temperature, five lowest and highest temperatures. <?php $month_temp = "78, 60, 62, 68, 71, 68, 73, 85, 66, 64, 76, 63, 81, 76, 73, 68, 72, 73, 75, 65, 74, 63, 67, 65, 64, 68, 73, 75, 79, 73"; $temp_array = explode(',', $month_temp); $tot_temp = 0; $temp_array_length = count($temp_array); foreach($temp_array as $temp) { $tot_temp += $temp; } $avg_high_temp = $tot_temp/$temp_array_length; echo "Average Temperature is : ".$avg_high_temp."; sort($temp_array); echo " List of five lowest temperatures :"; for ($i=0; $i< 5; $i++) { echo $temp_array[$i].", "; } echo "List of five highest temperatures :"; for ($i=($temp_array_length-5); $i< ($temp_array_length); $i++) { echo $temp_array[$i].", "; } ?>

PHP fiction to change array values to upper and lower case

<?php function array_change_value_case($input, $ucase) { $case = $ucase; $narray = array(); if (!is_array($input)) { return $narray; } foreach ($input as $key => $value) { if (is_array($value)) { $narray[$key] = array_change_value_case($value, $case); continue; } $narray[$key] = ($case == CASE_UPPER ? strtoupper($value) : strtolower($value)); } return $narray; } $Color = array('A' => 'Blue', 'B' => 'Green', 'c' => 'Red'); echo 'Actual array '; print_r($Color); echo 'Values are in lower case.'; $myColor = array_change_value_case($Color,CASE_LOWER); print_r($myColor); echo 'Values are in upper case.'; $myColor = array_change_value_case($Color,CASE_UPPER); print_r($myColor); ?>

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