PHP Exercises: Compute sum of the prime numbers less than 100
PHP: Exercise-37 with Solution
Write a PHP program to compute the sum of the prime numbers less than 100.
Note: There are 25 prime numbers are there in less than 100.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 and sum of all these numbers is 1060.
Sample Solution: -
PHP Code:
<?php
$primes = array();
$is_prime_no = false;
for ($i = 2; $i<100; $i++) {
$is_prime_no = true;
for ($j = 2; $j<=($i/2); $j++) {
if ($i%$j==0) {
$is_prime_no = false;
break;
}
}
if ($is_prime_no) {
array_push($primes,$i);
}
if (count($primes)==100) {
break;
}
}
echo array_sum($primes)."\n";
?>
Sample Output:
1060
Flowchart:

PHP Code Editor:
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PHP: Tips of the Day
Mutates the original array to filter out the values specified
Example:
<?php function tips_pull(&$items, ...$params) { $items = array_values(array_diff($items, $params)); return $items; } $items = ['x', 'y', 'z', 'x', 'y', 'z']; print_r(tips_pull($items, 'y', 'z')); ?>
Output:
Array ( [0] => x [1] => x )
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