Convert images on the fly with PHP

Sample code used to resize images in PHP.

<?php
function createThumbnail($image_name,$new_width,$new_height,$uploadDir,$moveToDir)
{
    $path = $uploadDir . '/' . $image_name;

    $mime = getimagesize($path);

    if($mime['mime']=='image/png') {
        $src_img = imagecreatefrompng($path);
    }
    if($mime['mime']=='image/jpg' || $mime['mime']=='image/jpeg' || $mime['mime']=='image/pjpeg') {
        $src_img = imagecreatefromjpeg($path);
    }

    $old_x          =   imageSX($src_img);
    $old_y          =   imageSY($src_img);

    if($old_x > $old_y)
    {
        $thumb_w    =   $new_width;
        $thumb_h    =   $old_y*($new_height/$old_x);
    }

    if($old_x < $old_y)
    {
        $thumb_w    =   $old_x*($new_width/$old_y);
        $thumb_h    =   $new_height;
    }

    if($old_x == $old_y)
    {
        $thumb_w    =   $new_width;
        $thumb_h    =   $new_height;
    }

    $dst_img        =   ImageCreateTrueColor($thumb_w,$thumb_h);

    imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y);


    // New save location
    $new_thumb_loc = $moveToDir . $image_name;

    if($mime['mime']=='image/png') {
        $result = imagepng($dst_img,$new_thumb_loc,8);
    }
    if($mime['mime']=='image/jpg' || $mime['mime']=='image/jpeg' || $mime['mime']=='image/pjpeg') {
        $result = imagejpeg($dst_img,$new_thumb_loc,80);
    }

    imagedestroy($dst_img);
    imagedestroy($src_img);

    return $result;
}


function compress($source, $destination, $quality) {

    $info = getimagesize($source);

    if ($info['mime'] == 'image/jpeg')
        $image = imagecreatefromjpeg($source);

    elseif ($info['mime'] == 'image/gif')
        $image = imagecreatefromgif($source);

    elseif ($info['mime'] == 'image/png')
        $image = imagecreatefrompng($source);

    imagejpeg($image, $destination, $quality);

    return $destination;
}

//$source_img = 'source.jpg';
//$destination_img = 'destination .jpg';

//$d = compress($source_img, $destination_img, 90);

$image_name = 'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png';


$img_src =  "Image1";
if(isset($_GET['Image2']))
{
        $dest_size = 1800;
        list($width, $height) = getimagesize($image_name);
        $img = imagecreatefrompng($image_name);
        $largersize = $width;
        if ($height > $width)
        {
                $largersize = $height;
        }
        $ratioToShrink = 0;
        if ($largersize > $dest_size || true)
        {
                $ratioToShrink = $largersize / $dest_size;
                //echo $ratioToShrink . "<br>";

                $newheight = round($height / $ratioToShrink, 0, PHP_ROUND_HALF_UP);
                $newwidth = round($width / $ratioToShrink, 0, PHP_ROUND_HALF_UP);
                //echo $newheight . "<br>";
                //echo $newwidth . "<br>";
                //$img = imagescale( $img, 600, 200 );
                $img = imagescale( $img, $newwidth, $newheight );
        }
        //header("content-type: text/html; charset=UTF-8");
        header("Content-type: image/png");
        imagepng($img);
        return;
}
        if(isset($_GET['Image']))
        {

        // Assign image file to variable

        // Load image file
        $image = imagecreatefrompng($image_name);

        // Use imagescale() function to scale the image
        $img = imagescale( $image, 500, 400 );

        // Output image in the browser
        header("Content-type: image/png");
        imagepng($img);

                //$img_src=$_GET['img_src']
        }
        else
        {
                echo "<br>Before: " . var_dump(getimagesize($image_name));
                echo "<br><img src='./" . $_SERVER['PHP_SELF'] . "?Image=" . $img_src . "' alt='img'><br>After: ";
                echo "<br><img src='" . $image_name . "' alt='img'><br>";
                echo "<br><img src='./" . $_SERVER['PHP_SELF'] . "?Image2=" . $img_src . "' alt='img'><br>After: ";
                //echo "Before: " . var_dump(getimagesize("./" . $_SERVER['PHP_SELF'] . "?Image=" . $img_src . "));
                header("content-type: text/html; charset=UTF-8");

                echo 15/2;

        }

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<?php

function createThumbnail($image_name,$new_width,$new_height,$uploadDir,$moveToDir)

{

$path = $uploadDir . '/' . $image_name;

$mime = getimagesize($path);

if($mime['mime']=='image/png') {

$src_img = imagecreatefrompng($path);

}

if($mime['mime']=='image/jpg' || $mime['mime']=='image/jpeg' || $mime['mime']=='image/pjpeg') {

$src_img = imagecreatefromjpeg($path);

}

$old_x = imageSX($src_img);

$old_y = imageSY($src_img);

if($old_x > $old_y)

{

$thumb_w = $new_width;

$thumb_h = $old_y*($new_height/$old_x);

}

if($old_x < $old_y)

{

$thumb_w = $old_x*($new_width/$old_y);

$thumb_h = $new_height;

}

if($old_x == $old_y)

{

$thumb_w = $new_width;

$thumb_h = $new_height;

}

$dst_img = ImageCreateTrueColor($thumb_w,$thumb_h);

imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y);

// New save location

$new_thumb_loc = $moveToDir . $image_name;

if($mime['mime']=='image/png') {

$result = imagepng($dst_img,$new_thumb_loc,8);

}

if($mime['mime']=='image/jpg' || $mime['mime']=='image/jpeg' || $mime['mime']=='image/pjpeg') {

$result = imagejpeg($dst_img,$new_thumb_loc,80);

}

imagedestroy($dst_img);

imagedestroy($src_img);

return $result;

}

function compress($source, $destination, $quality) {

$info = getimagesize($source);

if ($info['mime'] == 'image/jpeg')

$image = imagecreatefromjpeg($source);

elseif ($info['mime'] == 'image/gif')

$image = imagecreatefromgif($source);

elseif ($info['mime'] == 'image/png')

$image = imagecreatefrompng($source);

imagejpeg($image, $destination, $quality);

return $destination;

}

//$source_img = 'source.jpg';

//$destination_img = 'destination .jpg';

//$d = compress($source_img, $destination_img, 90);

$image_name = 'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png';

$img_src = "Image1";

if(isset($_GET['Image2']))

{

$dest_size = 1800;

list($width, $height) = getimagesize($image_name);

$img = imagecreatefrompng($image_name);

$largersize = $width;

if ($height > $width)

{

$largersize = $height;

}

$ratioToShrink = 0;

if ($largersize > $dest_size || true)

{

$ratioToShrink = $largersize / $dest_size;

//echo $ratioToShrink . " ";

$newheight = round($height / $ratioToShrink, 0, PHP_ROUND_HALF_UP);

$newwidth = round($width / $ratioToShrink, 0, PHP_ROUND_HALF_UP);

//echo $newheight . " ";

//echo $newwidth . " ";

//$img = imagescale( $img, 600, 200 );

$img = imagescale( $img, $newwidth, $newheight );

}

//header("content-type: text/html; charset=UTF-8");

header("Content-type: image/png");

imagepng($img);

return;

}

if(isset($_GET['Image']))

{

// Assign image file to variable

// Load image file

$image = imagecreatefrompng($image_name);

// Use imagescale() function to scale the image

$img = imagescale( $image, 500, 400 );

// Output image in the browser

header("Content-type: image/png");

imagepng($img);

//$img_src=$_GET['img_src']

}

else

{

echo " Before: " . var_dump(getimagesize($image_name));

echo " <img src='./" . $_SERVER['PHP_SELF'] . "?Image=" . $img_src . "' alt='img'> After: ";

echo " <img src='" . $image_name . "' alt='img'> ";

echo " <img src='./" . $_SERVER['PHP_SELF'] . "?Image2=" . $img_src . "' alt='img'> After: ";

//echo "Before: " . var_dump(getimagesize("./" . $_SERVER['PHP_SELF'] . "?Image=" . $img_src . "));

header("content-type: text/html; charset=UTF-8");

echo 15/2;

}

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