note 89865 deleted from function.imagecreatefromjpeg by cmb
| From: | cmb@php.net | Date: | Sun, 11 Dec 2016 11:05:35 +0000 |
| Subject: | note 89865 deleted from function.imagecreatefromjpeg by cmb | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-208486@lists.php.net to get a copy of this message | ||
Note Submitter: francesco@essensys
----
I didn't find any example like this, so I mixed pieces together.. hope this will save time to
other people!
Here's a complete solution to READ any image (gif jpg png) from the FILESYSTEM, SCALE it to a
max width/height, SAVE the scaled image to a BLOB field keeping the original image type. Quite
tricky..
<?php
function scaleImageFileToBlob($file) {
$source_pic = $file;
$max_width = 200;
$max_height = 200;
list($width, $height, $image_type) = getimagesize($file);
switch ($image_type)
{
case 1: $src = imagecreatefromgif($file); break;
case 2: $src = imagecreatefromjpeg($file); break;
case 3: $src = imagecreatefrompng($file); break;
default: return ''; break;
}
$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;
if( ($width <= $max_width) && ($height <= $max_height) ){
$tn_width = $width;
$tn_height = $height;
}elseif (($x_ratio * $height) < $max_height){
$tn_height = ceil($x_ratio * $height);
$tn_width = $max_width;
}else{
$tn_width = ceil($y_ratio * $width);
$tn_height = $max_height;
}
$tmp = imagecreatetruecolor($tn_width,$tn_height);
/* Check if this image is PNG or GIF to preserve its transparency */
if(($image_type == 1) OR ($image_type==3))
{
imagealphablending($tmp, false);
imagesavealpha($tmp,true);
$transparent = imagecolorallocatealpha($tmp, 255, 255, 255, 127);
imagefilledrectangle($tmp, 0, 0, $tn_width, $tn_height, $transparent);
}
imagecopyresampled($tmp,$src,0,0,0,0,$tn_width, $tn_height,$width,$height);
/*
* imageXXX() has only two options, save as a file, or send to the browser.
* It does not provide you the oppurtunity to manipulate the final GIF/JPG/PNG file stream
* So I start the output buffering, use imageXXX() to output the data stream to the browser,
* get the contents of the stream, and use clean to silently discard the buffered contents.
*/
ob_start();
switch ($image_type)
{
case 1: imagegif($tmp); break;
case 2: imagejpeg($tmp, NULL, 100); break; // best quality
case 3: imagepng($tmp, NULL, 0); break; // no compression
default: echo ''; break;
}
$final_image = ob_get_contents();
ob_end_clean();
return $final_image;
}
?>
So, let's suppose you have a form where a user can upload an image, and you have to scale it
and save it into your database.
<?php
[..] // the user has clicked the Submit button..
// Check if the user entered an image
if ($_FILES['imagefile']['name'] != '') {
$image = scaleImageFileToBlob($_FILES['imagefile']['tmp_name']);
if ($image == '') {
echo 'Image type not supported';
} else {
$image_type = $_FILES['imagefile']['type'];
$image = addslashes($image);
$query = "UPDATE yourtable SET image_type='$image_type',
image='$image' WHERE ...";
$result = mysql_query($query);
if ($result) {
echo 'Image scaled and uploaded';
} else {
echo 'Error running the query';
}
}
}
?>