Reflections эффект на php

Иногда необходимо на сайте сделать красивый вывод изображений. Например с зеркальным отражением на поверхности. Да, да – это возможно при помощи PHP!

<?php
	/*
		-------------------------------------------------------------------
		Easy Reflections v3 by Richard Davey, Core PHP (rich@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)
        fade_start      optional    Start the alpha fade from whch value? (% value)
        fade_end        optional    End the alpha fade from whch value? (% value)
        cache           optional    Save reflection image to the cache? (boolean)
        tint            optional    Tint the reflection with this colour (hex)
	*/

	//	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();
	}

    //    GD Version check
    $gd_info = gd_info();

    if ($gd_info['PNG Support'] == false)
    {
        echo 'This version of the GD extension cannot output PNG images.';
        exit();
    }

    if (ereg_replace('[[:alpha:][:space:]()]+', '', $gd_info['GD Version']) < '2.0.1')
    {
        echo 'GD library is too old. Version 2.0.1 or later is required, and 2.0.28 is strongly recommended.';
        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'];
		$source_image = str_replace('://','',$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();
	}

    //    tint (the colour used for the tint, defaults to white if not given)

    if (isset($_GET['tint']) == false)
    {
        $red = 127;
        $green = 127;
        $blue = 127;
    }
    else
    {
        //    Extract the hex colour
        $hex_bgc = $_GET['tint'];

        //    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 white
                $red = 127;
                $green = 127;
                $blue = 127;
        }
    }

	//	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 == 100)
			{
                $output_height = "0.99";
			}
			elseif ($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);

    //  Save any alpha data that might have existed in the source image and disable blending
    imagesavealpha($source, true);

    imagesavealpha($output, true);
    imagealphablending($output, false);

    imagesavealpha($buffer, true);
    imagealphablending($buffer, false);

	//	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.

	//	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);

    imagelayereffect($output, IMG_EFFECT_OVERLAY);

    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));
        }

        //  Rejig it because of the way in which the image effect overlay works
        $final_alpha = 127 - $alpha;

        //imagefilledrectangle($output, 0, $y, $width, $y, imagecolorallocatealpha($output, 127, 127, 127, $final_alpha));
        imagefilledrectangle($output, 0, $y, $width, $y, imagecolorallocatealpha($output, $red, $green, $blue, $final_alpha));
    }

	/*
		----------------------------------------------------------------
		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
	{
	    //	PNG
	    header("Content-type: image/png");
	    imagepng($output);

        // Save cached file
        if ($cache)
        {
            imagepng($output, $cache_path);
        }

		imagedestroy($output);
		exit();
	}
?>
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