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Prime number in PHP

A prime number is a natural number/whole number/cardinal number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number.
e.g. 2, 3, 5, 7, 11, 13, 17….etc are prime numbers; while 4, 6, 8, 9, 10, 12, 14, 15, 16….etc are composite numbers.

Program to determine if the supplied number is Prime or Composite using native bcmod() function.

<?php
$num = 26; // desired number to check
for ( $i = 2; $i <= $num - 1; $i++ ) {
    if ( bcmod( $num, $i ) == 0 ) {
        echo $num . " is composite number";
        break;
    }
}
if ( $num == $i )
    echo $num . " is prime number";
?>
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By Swatantra Kumar

Swatantra is an Open Source evangelist, a technologist and researcher. Professionally, he does software development, software architecture, server administration and project management. When he's not writing software, he enjoys building web entities and servers, reading about and working with new technologies, and trying to get his friends to make the move to open source software. He's written, co-written and published many articles in international journals, on various domains/topics including Open Source, Networks, Computer Organization, Mobile Technologies, and Business Intelligence. He made a proposal for an information management system at University level during graduation days.

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