image_resize.php

image_resize.php

<?php

$sourcePath      = '';
$destinationPath = '';
$maxHeight       = 1024;
$maxWith         = 768;

$ratio = $maxWith / $maxHeight;
$dir   = new DirectoryIterator($sourcePath);

foreach ($dir as $file) {
    if ($file->isDot()) {
        continue;
    }

    $sourceImage = null;
    $filePath    = $file->getPathname();

    switch (strtolower($file->getExtension())) {
        case 'jpg':
        case 'jpeg':
            $sourceImage = imagecreatefromjpeg($filePath);
            break;
        case 'png':
            $sourceImage = imagecreatefrompng($filePath);
            break;
        case 'gif':
            $sourceImage = imagecreatefromgif($filePath);
            break;
    }

    if (is_null($sourceImage)) {
        continue;
    }

    $scalePercent = null;

    list($currentWidth, $currentHeight) = getimagesize($filePath);

    $currentRatio = $currentHeight / $currentWidth;

    if ($currentRatio > $ratio) {
        $newHeight = $currentHeight;
        $newWidth  = $currentHeight * $ratio;
    } else {
        $newHeight = $currentWidth * $ratio;
        $newWidth  = $currentWidth;
    }

    $destinationImage = imagecreatetruecolor($newWidth, $newHeight);

    imagecopyresampled(
        $destinationImage,
        $sourceImage,
        0,
        0,
        0,
        0,
        $newWidth,
        $newHeight,
        $currentWidth,
        $currentHeight
    );

    $destinationImagePath = $destinationPath . '/' . $file->getBasename($file->getExtension()) . 'jpg';

    imagejpeg($destinationImage, $destinationImagePath, 80);

    imagedestroy($destinationImage);
    imagedestroy($sourceImage);
}