Minimum Upload Size, please!

Hello,

I have edited your code on the fly, not sure how it will render, but you can try:

add_action( 'admin_init', 'wpse_28359_block_authors_from_uploading_small_images' );

function wpse_28359_block_authors_from_uploading_small_images()
{
    if( !current_user_can( 'administrator') )
        add_filter( 'wp_handle_upload_prefilter', 'wpse_28359_block_small_images_upload' );
}

function wpse_28359_block_small_images_upload( $file )
{
    // Mime type with dimensions, check to exit earlier
    $mimes = array( 'image/jpeg', 'image/png', 'image/gif' );

    if( !in_array( $file['type'], $mimes ) )
        return $file;

    $img = filesize( $file['tmp_name'] );
    $minimum = "20000";
	$minimumsize = "20Kb";

    if ( $img < $minimum )
        $file['error'] =
            'Image too small. Minimum size is '
            . $minimumsize
            . '. Uploaded again with the required filesize ';

    return $file;
}

The idea is to use filesize() instead of getimagesize()

This code is checking for particular image dimensions (it’s currently configured for 640×480) – this may be a better method than file size, because a file with a larger size could still be smaller than the dimensions that you would really like.

With that said, the PHP function that would get the file size (in bytes) of the picture is:

filesize ( $file[‘tmp_name’] )

Checking the size of that against your minimum size – similar to how that function is checking the width and height – should do the trick.

This code is untested, but I’ve replaced the dimension check from the example above with a file size check:

<?php
add_action( 'admin_init', 'wpse_28359_block_authors_from_uploading_small_images' );

function wpse_28359_block_authors_from_uploading_small_images()
{
    if( !current_user_can( 'administrator') )
        add_filter( 'wp_handle_upload_prefilter', 'wpse_28359_block_small_images_upload' );
}

function wpse_28359_block_small_images_upload( $file )
{
    // Mime type with dimensions, check to exit earlier
    $mimes = array( 'image/jpeg', 'image/png', 'image/gif' );

    if( !in_array( $file['type'], $mimes ) )
        return $file;

    $minfilesize = 20000; //Minimum file size in bytes
	$imgfilesize = filesize ( $file['tmp_name'] );

	if ( $imgfilesize < 20000 )
		$file['error'] =
            'Image too small. Minimum file size is '
			. $minfilesize
			. ' bytes. The uploaded file is '
			. $imgfilesize
			. ' bytes.';

    return $file;
}
?>

Hey v123shine,

the code you posted checks for the image dimensions (width and heigth). I’ve added another check for the filesize.

I have tested it on a local WP install, please let me know if it doesn’t work!

add_action( 'admin_init', 'wpse_28359_block_authors_from_uploading_small_images' );

function wpse_28359_block_authors_from_uploading_small_images()
{
    if( !current_user_can( 'administrator') )
        add_filter( 'wp_handle_upload_prefilter', 'wpse_28359_block_small_images_upload' );
}

function wpse_28359_block_small_images_upload( $file )
{
    // Mime type with dimensions, check to exit earlier
    $mimes = array( 'image/jpeg', 'image/png', 'image/gif' );

    if( !in_array( $file['type'], $mimes ) )
        return $file;

    $img = getimagesize( $file['tmp_name'] );
    $minimum = array( 'width' => 640, 'height' => 480 );

    if ( $img[0] < $minimum['width'] )
        $file['error'] =
            'Image too small. Minimum width is '
            . $minimum['width']
            . 'px. Uploaded image width is '
            . $img[0] . 'px';

    elseif ( $img[1] < $minimum['height'] )
        $file['error'] =
            'Image too small. Minimum height is '
            . $minimum['height']
            . 'px. Uploaded image height is '
            . $img[1] . 'px';

      $imgsize = filesize($file['tmp_name']);
	$minsize = 800; // Minimun file size in KB
      if ( $imgsize < (1024 * $minsize) )
        $file['error'] =
            'File size too small. Minimum size is '
            . $minsize
            . 'kb. Uploaded file size is '
            . sprintf('%0.2f', ($imgsize /1024)) . ' kb';

    return $file;
}

Damn, beat by a minute =/

Thank you very much Mcfreder, Phil Erb and Ruda Almeida.

Problem solved ??