Solved

Change background color in PHP

Posted on 2008-10-03
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Last Modified: 2013-12-12
hi,

i am trying to use "Easy Reflections by Richard Davey, Core PHP (rich@corephp.co.uk) v2" to create a reflection effect on my website.  I can't figure out how to get the files that are reflecting to fade out to white/ or set the "bgc" background color to white..... it is set to fade to black right now/load on a page with a black background - I have tried what was reccomended on their site and nothing seems to be working.

Things that were reccomended on their site which does not work: you can achieve this in two ways: Either by appending the parameter '&bgc=ffffff' on every src attribute of the images or by adding the following line in the first row of the reflect.php: $_GET['bgc'] = '#ffffff';


  Can someone please take a look at this and help me out?  Ive already wasted a ton of hours trying to do it myself.  Thankyou so much, Bonnie
<?php

	/*

		----------------------------------------------------------------

		Easy Reflections by Richard Davey, Core PHP (rich@corephp.co.uk)

		v2 - 2nd March 2007

        Updates include changes by Monte Ohrt (monte@ohrt.com)

		----------------------------------------------------------------

		You are free to use this in any product, or on any web site.

		Latest builds at: http://reflection.corephp.co.uk

		----------------------------------------------------------------

		

		This script accepts the following $_GET parameters:

		

		img		        required	The source image (to reflect)

		height	        optional	Height of the reflection (% or pixel value)

		bgc		        optional	Background colour to fade into, default = #000000

        fade_start      optional    Start the alpha fade from whch value? (% value)

        fade_end        optional    End the alpha fade from whch value? (% value)

		jpeg	        optional	Output will be JPEG at 'param' quality (default 80)

        cache           optional    Save reflection image to the cache? (boolean)

	*/

	

	// Replace special chars to be HTML-Code

	function stringToHTML($string)

	{

		$array_search = array('é', 'è', 'ë', 'ê', 'à', 'ä', 'Ä', 'â', 'ù', 'ü', 'Ü', 'û', 'ö', 'Ö', 'ô', 'ï', 'î');

		$array_replace = array('&eacute;', '&egrave;',	'&euml;', '&ecirc;', '&agrave;', '&auml;', '&Auml;', '&acirc;', '&ugrave;', '&uuml;', '&Uuml;', '&ucirc;', '&ouml;', '&Ouml;', '&ocirc;', '&iuml;', '&icirc;');

		$string_return = str_replace($array_search, $array_replace, $string);

		return $string_return;

	}

 

	// CACHE! EVERYTHING! 

	$_GET['cache'] = 1;

 

	//	PHP Version sanity check

	if (version_compare('4.3.2', phpversion()) == 1)

	{

		echo 'This version of PHP is not fully supported. You need 4.3.2 or above.';

		exit();

	}

	

	//	GD check

	if (extension_loaded('gd') == false && !dl('gd.so'))

	{

		echo 'You are missing the GD extension for PHP, sorry but I cannot continue.';

		exit();

	}

	

	//	Our allowed query string parameters

 

    //  To cache or not to cache? that is the question

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

    {

        if ((int) $_GET['cache'] == 1)

        {

            $cache = true;

        }

        else

        {

            $cache = false;

        }

    }

    else

    {

        $cache = false;

    }

 

	//	img (the image to reflect)

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

	{

		$source_image = $_GET['img'];

 

		//$source_image = utf8_decode($source_image);

 

		$source_image = str_replace('://','',$source_image);

		//$source_image = $_SERVER['DOCUMENT_ROOT'] . DIRECTORY_SEPARATOR . $source_image;

        

        if (file_exists($source_image))

        {

            if ($cache)

            {

                $cache_dir = dirname($source_image);

                $cache_base = basename($source_image);

                $cache_file = 'refl_' . md5($_SERVER['REQUEST_URI']) . '_' . $cache_base;

                $cache_path = $cache_dir . DIRECTORY_SEPARATOR . $cache_file;

 

                if (file_exists($cache_path) && filemtime($cache_path) >= filemtime($source_image))

                {

                    // Use cached image

                    $image_info = getimagesize($cache_path);

                    header("Content-type: " . $image_info['mime']);

                    readfile($cache_path);

                    exit();

                }

            }

        }

        else

        {

          echo 'Cannot find or read source image';

          exit();

        }

	}

	else

	{

		echo 'No source image to reflect supplied';

		exit();

	}

 

	//	bgc (the background colour used, defaults to black if not given)

	if (isset($_GET['bgc']) == false)

	{

		$red = 0;

		$green = 0;

		$blue = 0;

	}

	else

	{

		//	Extract the hex colour

		$hex_bgc = $_GET['bgc'];

		

		//	Does it start with a hash? If so then strip it

		$hex_bgc = str_replace('#', '', $hex_bgc);

		

		switch (strlen($hex_bgc))

		{

			case 6:

				$red = hexdec(substr($hex_bgc, 0, 2));

				$green = hexdec(substr($hex_bgc, 2, 2));

				$blue = hexdec(substr($hex_bgc, 4, 2));

				break;

				

			case 3:

				$red = substr($hex_bgc, 0, 1);

				$green = substr($hex_bgc, 1, 1);

				$blue = substr($hex_bgc, 2, 1);

				$red = hexdec($red . $red);

				$green = hexdec($green . $green);

				$blue = hexdec($blue . $blue);

				break;

				

			default:

				//	Wrong values passed, default to black

				$red = 0;

				$green = 0;

				$blue = 0;

		}

	}

	

	//	height (how tall should the reflection be?)

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

	{

		$output_height = $_GET['height'];

		

		//	Have they given us a percentage?

		if (substr($output_height, -1) == '%')

		{

			//	Yes, remove the % sign

			$output_height = (int) substr($output_height, 0, -1);

 

			//	Gotta love auto type casting ;)

			if ($output_height < 10)

			{

				$output_height = "0.0$output_height";

			}

			else

			{

				$output_height = "0.$output_height";

			}

		}

		else

		{

			$output_height = (int) $output_height;

		}

	}

	else

	{

		//	No height was given, so default to 50% of the source images height

		$output_height = 0.50;

	}

	

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

	{

		if (strpos($_GET['fade_start'], '%') !== false)

		{

			$alpha_start = str_replace('%', '', $_GET['fade_start']);

			$alpha_start = (int) (127 * $alpha_start / 100);

		}

		else

		{

			$alpha_start = (int) $_GET['fade_start'];

		

			if ($alpha_start < 1 || $alpha_start > 127)

			{

				$alpha_start = 80;

			}

		}

	}

	else

	{

		$alpha_start = 80;

	}

 

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

	{

		if (strpos($_GET['fade_end'], '%') !== false)

		{

			$alpha_end = str_replace('%', '', $_GET['fade_end']);

			$alpha_end = (int) (127 * $alpha_end / 100);

		}

		else

		{

			$alpha_end = (int) $_GET['fade_end'];

		

			if ($alpha_end < 1 || $alpha_end > 0)

			{

				$alpha_end = 0;

			}

		}

	}

	else

	{

		$alpha_end = 0;

	}

 

	/*

		----------------------------------------------------------------

		Ok, let's do it ...

		----------------------------------------------------------------

	*/

	

	//	How big is the image?

	$image_details = getimagesize($source_image);

	

	if ($image_details === false)

	{

		echo 'Not a valid image supplied, or this script does not have permissions to access it.';

		exit();

	}

	else

	{

		$width = $image_details[0];

		$height = $image_details[1];

		$type = $image_details[2];

		$mime = $image_details['mime'];

	}

	

	//	Calculate the height of the output image

	if ($output_height < 1)

	{

		//	The output height is a percentage

		$new_height = $height * $output_height;

	}

	else

	{

		//	The output height is a fixed pixel value

		$new_height = $output_height;

	}

 

	//	Detect the source image format - only GIF, JPEG and PNG are supported. If you need more, extend this yourself.

	switch ($type)

	{

		case 1:

			//	GIF

			$source = imagecreatefromgif($source_image);

			break;

			

		case 2:

			//	JPG

			$source = imagecreatefromjpeg($source_image);

			break;

			

		case 3:

			//	PNG

			$source = imagecreatefrompng($source_image);

			break;

			

		default:

			echo 'Unsupported image file format.';

			exit();

	}

 

 

	/*

		----------------------------------------------------------------

		Build the reflection image

		----------------------------------------------------------------

	*/

 

	//	We'll store the final reflection in $output. $buffer is for internal use.

	$output = imagecreatetruecolor($width, $new_height);

	$buffer = imagecreatetruecolor($width, $new_height);

 

	//	Copy the bottom-most part of the source image into the output

	imagecopy($output, $source, 0, 0, 0, $height - $new_height, $width, $new_height);

	

	//	Rotate and flip it (strip flip method)

    for ($y = 0; $y < $new_height; $y++)

    {

       imagecopy($buffer, $output, 0, $y, 0, $new_height - $y - 1, $width, 1);

    }

 

	$output = $buffer;

	

	/*

		----------------------------------------------------------------

		Apply the fade effect

		----------------------------------------------------------------

	*/

	

	//	This is quite simple really. There are 127 available levels of alpha, so we just

	//	step-through the reflected image, drawing a box over the top, with a set alpha level.

	//	The end result? A cool fade into the background colour given.

 

	//	There are a maximum of 127 alpha fade steps we can use, so work out the alpha step rate

 

	$alpha_length = abs($alpha_start - $alpha_end);

 

	for ($y = 0; $y <= $new_height; $y++)

	{

		//  Get % of reflection height

		$pct = $y / $new_height;

 

		//  Get % of alpha

		if ($alpha_start > $alpha_end)

        {

            $alpha = (int) ($alpha_start - ($pct * $alpha_length));

        }

        else

        {

            $alpha = (int) ($alpha_start + ($pct * $alpha_length));

        }

 

		imagefilledrectangle($output, 0, $y, $width, $y, imagecolorallocatealpha($output, $red, $green, $blue, $alpha));

		

	}

 

		

	/*

		----------------------------------------------------------------

		HACK - Build the reflection image by combining the source 

		image AND the reflection in one new image!

		----------------------------------------------------------------

	*/

		$finaloutput = imagecreatetruecolor($width, $height+$new_height);

		imagecopy($finaloutput, $source, 0, 0, 0, 0, $width, $height);

		imagecopy($finaloutput, $output, 0, $height, 0, 0, $width, $new_height);

		$output = $finaloutput;

 

	/*

		----------------------------------------------------------------

		Output our final PNG

		----------------------------------------------------------------

	*/

 

	if (headers_sent())

	{

		echo 'Headers already sent, I cannot display an image now. Have you got an extra line-feed in this file somewhere?';

		exit();

	}

	else

	{

		//	If you'd rather output a JPEG instead of a PNG then pass the parameter 'jpeg' (no value needed) on the querystring

 

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

		{

			//	PNG

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

			imagepng($output);

 

            // Save cached file

            if ($cache)

            {

                imagepng($output, $cache_path);

            }

			

		}

		else

		{

			if(!isset( $_GET['jpeg']))  $_GET['jpeg'] = 90;

			

			$quality = (int) $_GET['jpeg'];

			

			if ($quality < 1 || $quality > 100)

			{

				$quality = 90;

			}

			

			//	JPEG (the final parameter = the quality, 0 = terrible, 100 = pixel perfect)

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

			imagejpeg($output, '', $quality);

 

			// Save cached file

            if ($cache)

            {

                imagejpeg($output, $cache_path, $quality);

            }

			

           

		}

 

		imagedestroy($output);

		exit();

	}

?>

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Question by:bonnieta
  • 2
3 Comments
 
LVL 15

Expert Comment

by:mr_egyptian
ID: 22638718
Change the values for $red, $green, and $blue in lines 112-114 and 143-145 from 0 to 255.  This should set the default fade-to color to white while still allowing custom colors if need be.
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Author Comment

by:bonnieta
ID: 22639470
already did that - it doesn't work
0
 
LVL 15

Accepted Solution

by:
mr_egyptian earned 500 total points
ID: 22639593
Hmm.  I just copied the script from this post, and tried it on my server. Fades to black. I made the changes I proposed above, and it fades to white. Maybe the image/page was just cached in your browser?
0

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