PHP

PHP resize image using ratio

To maintain the aspect ratio of your original image, calculate the factor by which you have to resize the image in the vertical and horizontal direction.
Example, resize image to 1920 max width or max height

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list($width, $height) = getimagesize("your file path");
$ratio = $width / $height;
 
if ($width > $height)
{
    //landscape
    if ($width > 1920 )
    {
        $full_width = 1920;
    }
    else
    {
        $full_width = $width;
    }
    //set full size
    $full_height = $full_width / $ratio;
 
    $size_full = array($full_width, $full_height);
}
else
{
    // Portrait
    if ($height > 1920 )
    {
        $full_height = 1920;
    }
    else
    {
        $full_height = $width;
    }
    //set full size
    $full_width = $full_height * $ratio;
 
    $size_full = array($full_width, $full_height);
}

By Keenlio, September 25, 2014

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