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Calculating image aspect ratio in PHP is very simple. First you need to find greatest common divisor(GCD). You can do that by using following function:

function GCD($a, $b) {
while ($b != 0)
$remainder = $a % $b;
$a = $b;
$b = $remainder;
}
return abs ($a);
}

If you compiled your PHP version with GMP functions, you can also use following:

$gcd = gmp_gcd($a, $b);

After finding GCD, simply divide both sides with it:

$a = 2048; // screen width
$b = 1152; // screen height
$gcd = GCD($a, $b);
$a = $a/$gcd;
$b = $b/$gcd;
$ratio = $a . ":" . $b;

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This entry was posted on Sunday, September 13th, 2009 at 6:49 am and is filed under PHP. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.