26 lines
372 B
PHP
26 lines
372 B
PHP
|
#!/usr/bin/env php
|
||
|
|
<?php
|
||
|
|
# PHP version of a Prime Number Finder
|
||
|
|
# haplo@mindstab.net
|
||
|
|
|
||
|
|
$MAX = $argv[1];
|
||
|
|
if($MAX < 1)
|
||
|
|
{
|
||
|
|
print "primes.php <MAX NUM>\n";
|
||
|
|
exit;
|
||
|
|
}
|
||
|
|
for($num=3; $num<= $MAX; $num+=2)
|
||
|
|
{
|
||
|
|
$max = sqrt($num);
|
||
|
|
$isPrime = true;
|
||
|
|
for($test=3;$test <= $max; $test+=2)
|
||
|
|
{
|
||
|
|
if(! ($num % $test)) {
|
||
|
|
$isPrime= false;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if($isPrime) print "$num\n";
|
||
|
|
}
|
||
|
|
?>
|