PHP - AJAX Photo Uploader

<?php // RAY_image_resize.php
error_reporting(E_ALL);

// RESIZE A PNG IMAGE TO FIT A PREDEFINED SIZE.  USES THE GD LIBRARY.
// MAN PAGES: http://php.net/manual/en/ref.image.php

// A FUNCTION TO DETERMINE IF GD IS AT LEVEL 2 OR MORE
function get_gd_info($display=FALSE)
{
    // IS GD INSTALLED AT ALL?  http://php.net/manual/en/function.gd-info.php
    if (!function_exists("gd_info"))
    {
        if ($display) echo "<br/>GD NOT INSTALLED\n";
        return FALSE;
    }

    // IF GD IS INSTALLED GET DETAILS
    $gd = gd_info();

    // IF DISPLAY IS REQUESTED, PRINT DETAILS
    if ($display)
    {
        echo "<br/>GD DETAILS:\n";
        foreach ($gd as $key => $value)
        {
            if ($value === TRUE)  $value = 'YES';
            if ($value === FALSE) $value = 'NO';
            echo "<br/>$key = $value \n";
        }
    }

    // RETURN THE VERSION NUMBER
    $gd_version = preg_replace('/[^0-9\.]/', '', $gd["GD Version"]);
    return $gd_version;
}


// A FUNCTION TO MAKE AN IMAGE INTO THE RIGHT WIDTH FOR PAGE DISPLAY
// WILL WORK IF GD2 NOT INSTALLED, BUT WILL MAKE BETTER IMAGES WITH GD2
// INPUT IS THE IMAGE FILE NAME, OUTPUT IS AN IMAGE RESOURCE, OR FALSE IF NO RESIZE NEEDED
function create_right_size_image($image, $width=300)
{
    // IS GD HERE?
    $gdv = get_gd_info();
    if (!$gdv) return FALSE;

    // GET AN IMAGE RESOURCE http://php.net/manual/en/function.imagecreatefromjpeg.php
    $source = imagecreatefrompng("$image");

    // GET THE X AND Y DIMENSIONS http://php.net/manual/en/function.imagesx.php
    $imageX = imagesx($source);
    $imageY = imagesy($source);

    // IF NO RESIZING IS NEEDED
    if ($imageX <= $width)
    {
        return FALSE;
    }

    // THE WIDTH IS TOO GREAT - MUST RESIZE
    $tnailX = $width;
    $tnailY = (int) (($tnailX * $imageY) / $imageX );

    // WHICH FUNCTIONS CAN RESIZE / RESAMPLE THE IMAGE?
    if ($gdv >= 2)
    {
        // IF GD IS AT LEVEL 2 OR ABOVE USE http://php.net/manual/en/function.imagecreatetruecolor.php
        $target = imagecreatetruecolor($tnailX, $tnailY);
        imagecopyresampled ($target, $source, 0, 0, 0, 0, $tnailX, $tnailY, $imageX, $imageY);
    }
    else
    {
        // IF GD IS AT A LOWER REVISION LEVEL
        $target = imagecreate($tnailX, $tnailY);
        imagecopyresized   ($target, $source, 0, 0, 0, 0, $tnailX, $tnailY, $imageX, $imageY);
    }
    // RETURN THE IMAGE RESOURCE
    return $target;
}



// SAMPLE CALLING SEQUENCE - SET THE FILE PATH URLS
$old = 'RAY_orig_600x374.png';
$new = 'RAY_temp_300x187.png';

// RESIZE THE FILE TO FIT DESIRED WIDTH, IF NECESSARY
if ($image_resource = create_right_size_image($old))
{
    // WRITE (OVERWRITE) THE IMAGE IN THE NEW FILE http://php.net/manual/en/function.imagepng.php
    imagepng($image_resource, $new);

    // FREE THE MEMORY USED FOR THE IMAGE
    imagedestroy($image_resource);

    // SHOW A LINK TO THE NEW IMAGE
    echo '<a target="_blank" href="' . $new . '">SEE NEW ' . $new . '</a>' . PHP_EOL;
}

// IF IMAGE DID NOT NEED TO BE RESIZED - WAS EQUAL OR SMALLER THAN DESIRED WIDTH
echo 'ORIGINAL: <a target="_blank" href="' . $old . '">SEE OLD ' . $old . '</a>' . PHP_EOL;

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