How to flip an image horizontally and vertically using php
I search the internet for this and I cannot find what I need.
I have an image (on or off the server) and I need to flip the image horizontally or vertically using php and display it like this:
<?
$img = $_GET['img'];
header('Content-type: image/png');
/*
do the flip work
*/
imagepng($img, NULL);
imagedestroy($tmp_img);
?>
How can i do this? Thanks everyone.
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3 answers
You can also achieve this with a family of functions imagecopy
if you don't have ImageMagick available. See this example :
function ImageFlip ( $imgsrc, $mode )
{
$width = imagesx ( $imgsrc );
$height = imagesy ( $imgsrc );
$src_x = 0;
$src_y = 0;
$src_width = $width;
$src_height = $height;
switch ( $mode )
{
case '1': //vertical
$src_y = $height -1;
$src_height = -$height;
break;
case '2': //horizontal
$src_x = $width -1;
$src_width = -$width;
break;
case '3': //both
$src_x = $width -1;
$src_y = $height -1;
$src_width = -$width;
$src_height = -$height;
break;
default:
return $imgsrc;
}
$imgdest = imagecreatetruecolor ( $width, $height );
if ( imagecopyresampled ( $imgdest, $imgsrc, 0, 0, $src_x, $src_y , $width, $height, $src_width, $src_height ) )
{
return $imgdest;
}
return $imgsrc;
}
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Using ImageMagick and methods flipImage()
and flopImage()
, the following example is from devzone.zend.com :
<?php
try {
// initialize object
$image = new Gmagick();
// read image file
$image->readImage('gallery/original.jpg');
// flip image vertically
$image->flipImage();
// write new image file
$image->writeImage('gallery/new_1.jpg');
// revert
$image->flipImage();
// flip image horizontally
$image->flopImage();
// write new image file
$image->writeImage('gallery/new_2.jpg');
// free resource handle
$image->destroy();
} catch (Exception $e) {
die ($e->getMessage());
}
?>
With the following results:
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