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imagecreatefromstring (PHP 4 >= 4.0.4, PHP 5) imagecreatefromstring -- Create a new image from the image stream in the string Descriptionresource imagecreatefromstring ( string image )
imagecreatefromstring() returns an image identifier
representing the image obtained from the given string. These types
will be automatically detected if your build of PHP supports them:
JPEG, PNG, GIF, WBMP, and GD2.
Return Values
An image resource will be returned on success. FALSE is returned if
the image type is unsupported, the data is not in a recognised format,
or the image is corrupt and cannot be loaded.
Examples
Example 1. imagecreatefromstring() example |
<?php
$data = 'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABl'
. 'BMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDr'
. 'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r'
. '8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg==';
$data = base64_decode($data);
$im = imagecreatefromstring($data);
if ($im !== false) {
header('Content-Type: image/png');
imagepng($im);
}
else {
echo 'An error occured.';
}
?>
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User Contributed Notes
imagecreatefromstring
not given
03-Aug-2003 04:14
A note to the previous question (if you still don't know it :))...
GIF's are 256 colors (or 8 bit), and the resample function needs true color I guess... that's why it works with JPG's and not with GIF's.
Next thing... you take a string, write it to file, open the file (imagecreatefromgif), and delete the file again.
if you do imagecreatefromstring($string) you can skip the temporary file part.
shiehj at yahoo dot com
11-Apr-2003 11:44
Here is the code I did to create a thumbnail image from the database blob field. The trick is to use "imagecreatefromstring()" to create an image file.
Jack Shieh
<?php
require("dbconfig.inc");
$id = $_GET['id'];
if($id) {
$link = @mysql_connect($host, $user, $password) or die("Could not connect: " . mysql_error());
@mysql_select_db($dbname, $link);
$query = "select filetype, image from pictures where id = $id";
$result = @mysql_query($query);
$data = @mysql_result($result,0,"image");
$type = @mysql_result($result,0,"filetype");
Header( "Content-type: $type");
$size = 150; $src = imagecreatefromstring($data);
$width = imagesx($src);
$height = imagesy($src);
$aspect_ratio = $height/$width;
if ($width <= $size) {
$new_w = $width;
$new_h = $height;
} else {
$new_w = $size;
$new_h = abs($new_w * $aspect_ratio);
}
$img = imagecreatetruecolor($new_w,$new_h);
imagecopyresized($img,$src,0,0,0,0,$new_w,$new_h,$width,$height);
if ($type == "image/pjpeg") {
imagejpeg($img);
} else if ($type == "image/x-png") {
imagepng($img);
} else if ($type == "image/gif") {
imagegif($img);
}
imagedestroy($img);
mysql_close($link);
};
?>
adrian_schmidt at yahoo dot com
05-Mar-2003 06:04
I'm trying to get the imagecreatefromstring to work with GIFs. Of course, it won't.
I've read the tips but can't get them to work either.
The following is what I tried, based on above tips:
---
header('Content-Type: image/gif');
header('Content-Disposition: inline; filename=file.gif');
$temp = tmpfile();
fwrite($temp, $line['image']);
$src_img = imagecreatefromgif($temp);
fclose($temp); // this removes the file
$dst_img = imagecreatetruecolor(100, 100);
imagecopyresampled($dst_img, $src_img, 0,0,0,0, 100,100, imagesx($src_img), imagesy($src_img));
imagegif($dst_img);
---
where $line['image'] is the gif as taken from my MySQL database...
If anyone that has been able to make something like this work could give me a working piece of code I'd be really greatful!
I would be great if the tempfile could be excluded too...
Below is a working piece of code for jpeg:
---
header('Content-Type: image/jpeg');
header('Content-Disposition: inline; filename=file.jpg');
$src_img = imagecreatefromstring($line['image']);
$dst_img = imagecreatetruecolor(100, 100);
imagecopyresampled($dst_img, $src_img, 0,0,0,0, 100,100, imagesx($src_img), imagesy($src_img));
imagejpeg($dst_img);
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imagecreatefrompng