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();
}
?>
