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31 lines
516 B
PHP
31 lines
516 B
PHP
<?php
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/**
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* This function check whether
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* the provided integer is a prime
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* number or not.
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*
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* @param Integer $number An integer input
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* @return boolean whether the number is prime or not
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*/
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function isPrime(int $number)
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{
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if ($number === 2) {
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return true;
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}
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if ($number % 2 === 0 or $number < 2) {
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return false;
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}
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$i = 3;
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while ($i <= sqrt($number)) {
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if ($number % $i === 0) {
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return false;
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}
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$i += 2;
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}
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return true;
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}
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