PHP 8.3.4 Released!

getimagesize

(PHP 4, PHP 5, PHP 7, PHP 8)

getimagesizeLiefert die Größe einer Grafik

Beschreibung

getimagesize(string $filename, array &$image_info = null): array|false

Die Funktion getimagesize() ermittelt die Größe der übergebenen Grafik, sofern das Format unterstützt wird, und gibt die Abmessungen zusammen mit dem Dateityp und einer Zeichenkette aus Breite und Höhe zurück, die innerhalb eines regulären HTML-IMG-Tags verwendet werden kann. Außerdem wird der entsprechende HTTP-Content-Type zurückgegeben.

getimagesize() kann im Parameter image_info weitere Informationen liefern.

Achtung

Diese Funktion erwartet, dass filename eine gültige Bilddatei ist. Wird eine Datei angegeben, die kein Bild enthält, kann sie fälschlicherweise als Bild erkannt werden und die Funktion wird erfolgreich ausgeführt, aber das Array kann unsinnige Werte enthalten.

getimagesize() sollte nicht verwendet werden, um zu überprüfen, ob eine gegebene Datei ein Bild enthält. Stattdessen sollte eine für diesen Zweck entwickelte Lösung wie die Erweiterung Fileinfo verwendet werden.

Hinweis: Beachten Sie, dass JPC und JP2 aus Komponenten mit verschiedener Farbtiefe bestehen können. In diesem Fall entspricht der Wert für "bits" dem höchsten gefundenen Wert. Des Weiteren können JP2-Dateien mehrere JPEG-2000-Codestreams enthalten. In diesem Fall gibt getimagesize() die Werte des ersten gefundenen Codestreams zurück.

Hinweis: Informationen über Icons werden für das Icon mit der höchsten Bitrate ermittelt.

Hinweis: GIF-Bilder bestehen aus einem oder mehreren Frames, wobei jeder Frame nur einen Teil des Bildes belegen kann. Die Größe des Bildes, die von getimagesize() gemeldet wird, ist die Gesamtgröße (ermittelt aus dem Logical Screen Descriptor).

Parameter-Liste

filename

Die zu überprüfende Datei. Dabei kann es sich um eine lokale Datei oder, eine entsprechende Konfiguration vorausgesetzt, um eine entfernte Datei handeln, die über einen der unterstützten Streams gelesen wird.

image_info

Dieser optionale Parameter erlaubt es, erweiterte Informationen aus der Datei zu ermitteln. Aktuell werden die verschiedenen JPG-APP-Markierungen als assoziatives Array zurückgegeben. Diese Markierungen werden von einigen Programmen verwendet um, Textinformationen in Grafiken zu speichern. Gebräuchlich ist die Einbettung von » IPTC-Informationen in die APP13-Markierung. Sie können iptcparse() verwenden, um die binäre APP13-Markierung in ein lesbares Format zu übertragen.

Hinweis:

Der Parameter image_info unterstützt nur JFIF-Dateien.

Rückgabewerte

Gibt ein Array mit bis zu sieben Elementen zurück. Nicht alle Bildtypen enthalten die Elemente channels und bits.

Index 0 und 1 enthalten die Breite bzw. die Höhe des Bildes.

Hinweis:

Einige Formate enthalten keine oder mehrere Grafiken. In diesen Fällen ist getimagesize() möglicherweise nicht in der Lage, die Abmessungen zu ermitteln; der Rückgabewert für Breite und Höhe ist in diesen Fällen 0.

Index 2 ist eine der IMAGETYPE_XXX-Konstanten, die den Typ der Grafik angeben.

Index 3 ist eine Zeichenkette mit dem Attributen Breite und Höhe in der Form height="yyy" width="xxx" zur Verwendung in einem IMG-Tag.

mime entspricht dem MIME-Typ der Grafik. Diese Information kann zur Auslieferung von Grafiken mit dem entsprechenden HTTP-Content-type-Header dienen.

Beispiel #1 getimagesize() und MIME-Typ

<?php
$size
= getimagesize($filename);
$fp = fopen($filename, "rb");
if (
$size && $fp) {
header("Content-type: {$size['mime']}");
fpassthru($fp);
exit;
} else {
// Fehler
}
?>

channels hat für RGB-Grafiken den Wert 3, für CMYK den Wert 4.

bits entspricht der Anzahl der Bits pro Farbe.

Für einige Bildformate kann die Angebe von channels und bits irreführend sein. Beispielsweise nutzt GIF immer drei Kanäle pro Pixel, aber die Anzahl der Bits pro Pixel kann für ein animiertes GIF mit einer globalen Farbtabelle nicht errechnet werden.

Gibt im Falle eines Fehlers false zurück.

Fehler/Exceptions

Wenn ein Zugriff auf die mit filename angegebene Grafik nicht möglich ist, wird getimagesize() einen Fehler der Stufe E_WARNING generieren. Bei einem Lesefehler wird getimagesize() einen Fehler der Stufe E_NOTICE hervorrufen.

Changelog

Version Beschreibung
8.2.0 Gibt nun die tatsächlichen Abmessungen, Bits und Kanäle von AVIF-Bildern zurück; zuvor wurden die Abmessungen als 0x0 zurückgegeben, und Bits und Kanäle wurden überhaupt nicht zurückgegeben.
7.1.0 Unterstützung für WebP hinzugefügt.

Beispiele

Beispiel #2 getimagesize()-Beispiel

<?php
list($width, $height, $type, $attr) = getimagesize("img/flag.jpg");
echo
"<img src=\"img/flag.jpg\" $attr alt=\"getimagesize() example\" />";
?>

Beispiel #3 getimagesize (URL)

<?php
$size
= getimagesize("http://www.example.com/gifs/logo.gif");

// if the file name has space in it, encode it properly
$size = getimagesize("http://www.example.com/gifs/lo%20go.gif");

?>

Beispiel #4 getimagesize() mit Rückgabe von IPTC

<?php
$size
= getimagesize("testimg.jpg", $info);
if (isset(
$info["APP13"])) {
$iptc = iptcparse($info["APP13"]);
var_dump($iptc);
}
?>

Anmerkungen

Hinweis:

Diese Funktion benötigt die GD-Bibliothek nicht.

Siehe auch

add a note

User Contributed Notes 24 notes

up
87
james dot relyea at zifiniti dot com
15 years ago
As noted below, getimagesize will download the entire image before it checks for the requested information. This is extremely slow on large images that are accessed remotely. Since the width/height is in the first few bytes of the file, there is no need to download the entire file. I wrote a function to get the size of a JPEG by streaming bytes until the proper data is found to report the width and height:

<?php
// Retrieve JPEG width and height without downloading/reading entire image.
function getjpegsize($img_loc) {
$handle = fopen($img_loc, "rb") or die("Invalid file stream.");
$new_block = NULL;
if(!
feof($handle)) {
$new_block = fread($handle, 32);
$i = 0;
if(
$new_block[$i]=="\xFF" && $new_block[$i+1]=="\xD8" && $new_block[$i+2]=="\xFF" && $new_block[$i+3]=="\xE0") {
$i += 4;
if(
$new_block[$i+2]=="\x4A" && $new_block[$i+3]=="\x46" && $new_block[$i+4]=="\x49" && $new_block[$i+5]=="\x46" && $new_block[$i+6]=="\x00") {
// Read block size and skip ahead to begin cycling through blocks in search of SOF marker
$block_size = unpack("H*", $new_block[$i] . $new_block[$i+1]);
$block_size = hexdec($block_size[1]);
while(!
feof($handle)) {
$i += $block_size;
$new_block .= fread($handle, $block_size);
if(
$new_block[$i]=="\xFF") {
// New block detected, check for SOF marker
$sof_marker = array("\xC0", "\xC1", "\xC2", "\xC3", "\xC5", "\xC6", "\xC7", "\xC8", "\xC9", "\xCA", "\xCB", "\xCD", "\xCE", "\xCF");
if(
in_array($new_block[$i+1], $sof_marker)) {
// SOF marker detected. Width and height information is contained in bytes 4-7 after this byte.
$size_data = $new_block[$i+2] . $new_block[$i+3] . $new_block[$i+4] . $new_block[$i+5] . $new_block[$i+6] . $new_block[$i+7] . $new_block[$i+8];
$unpacked = unpack("H*", $size_data);
$unpacked = $unpacked[1];
$height = hexdec($unpacked[6] . $unpacked[7] . $unpacked[8] . $unpacked[9]);
$width = hexdec($unpacked[10] . $unpacked[11] . $unpacked[12] . $unpacked[13]);
return array(
$width, $height);
} else {
// Skip block marker and read block size
$i += 2;
$block_size = unpack("H*", $new_block[$i] . $new_block[$i+1]);
$block_size = hexdec($block_size[1]);
}
} else {
return
FALSE;
}
}
}
}
}
return
FALSE;
}
?>
up
17
nikolam3244 at gmail dot com
6 years ago
There's a code snippet for getting JPEG image dimensions by getting only first few bytes of the file, but it doesn't work for PNG files, so I wrote one. It will download only the first 24 bytes instead of the whole image, and thus being much faster than getimagesize() and it will save bandwidth at the same time:

<?php
// Retrieve PNG width and height without downloading/reading entire image.
function getpngsize( $img_loc ) {
$handle = fopen( $img_loc, "rb" ) or die( "Invalid file stream." );

if ( !
feof( $handle ) ) {
$new_block = fread( $handle, 24 );
if (
$new_block[0] == "\x89" &&
$new_block[1] == "\x50" &&
$new_block[2] == "\x4E" &&
$new_block[3] == "\x47" &&
$new_block[4] == "\x0D" &&
$new_block[5] == "\x0A" &&
$new_block[6] == "\x1A" &&
$new_block[7] == "\x0A" ) {
if (
$new_block[12] . $new_block[13] . $new_block[14] . $new_block[15] === "\x49\x48\x44\x52" ) {
$width = unpack( 'H*', $new_block[16] . $new_block[17] . $new_block[18] . $new_block[19] );
$width = hexdec( $width[1] );
$height = unpack( 'H*', $new_block[20] . $new_block[21] . $new_block[22] . $new_block[23] );
$height = hexdec( $height[1] );

return array(
$width, $height );
}
}
}

return
false;
}
?>
up
15
tomasz at trejderowski dot pl
10 years ago
If you want to "convert" value returned by "getimagesize()" as index "2" into something more human-readable, you may consider using a function like this one:

$imageTypeArray = array
(
0=>'UNKNOWN',
1=>'GIF',
2=>'JPEG',
3=>'PNG',
4=>'SWF',
5=>'PSD',
6=>'BMP',
7=>'TIFF_II',
8=>'TIFF_MM',
9=>'JPC',
10=>'JP2',
11=>'JPX',
12=>'JB2',
13=>'SWC',
14=>'IFF',
15=>'WBMP',
16=>'XBM',
17=>'ICO',
18=>'COUNT'
);

$size = getimagesize($filename);

$size[2] = $imageTypeArray[$size[2]];

Or something similar.
up
18
php dot net at dannysauer dot com
19 years ago
Note that, if you're going to be a good programmer and use named constatnts (IMAGETYPE_JPEG) rather than their values (2), you want to use the IMAGETYPE variants - IMAGETYPE_JPEG, IMAGETYPE GIF, IMAGETYPE_PNG, etc. For some reason, somebody made a horrible decision, and IMG_PNG is actually 4 in my version of PHP, while IMAGETYPE_PNG is 3. It took me a while to figure out why comparing the type against IMG_PNG was failing...
up
5
simon dot waters at surevine dot com
8 years ago
Note: getimage size doesn't attempt to validate image file formats

It is possible for malformed GIF images to contain PHP and still have valid dimensions.

Programmers need to ensure such images are validated by other tools, or never treated as PHP or other executable types (enforcing appropriate extensions, avoiding user controlled renaming, restricting uploaded images to areas of the website where PHP is not enabled).

http://ha.ckers.org/blog/20070604/passing-malicious-php-through-getimagesize/
up
3
utilmind
12 years ago
Here is the function which determines whether the PNG image contains alpha or not:

<?php
function is_alpha_png($fn){
return (
ord(@file_get_contents($fn, NULL, NULL, 25, 1)) == 6);
}
?>

The color type of PNG image is stored at byte offset 25. Possible values of that 25'th byte is:
* 0 - greyscale
* 2 - RGB
* 3 - RGB with palette
* 4 - greyscale + alpha
* 6 - RGB + alpha
up
3
redcore at gmail dot com
16 years ago
It's always good to check out an image's dimensions while attempting to upload to your server or database...especially if it's going to be displayed on a page that doesn't accomodate images beyond a particular size.

<?php

$tmpName
= $_FILES['userfile']['tmp_name'];

list(
$width, $height, $type, $attr) = getimagesize($tmpName);

if(
$width>275 || $height>275)
{
die(
"exceeded image dimension limits.");
}

?>
up
5
info at alex-lawrence dot com
15 years ago
Could be useful (didn´t know where to post it):

function getImageErrors( $filename, $type = "", $minWidth = 0, $minHeight = 0, $maxWidth = 0, $maxHeight = 0, $maxFileSize = 0 )
{
$errors = array();
if ( file_exists( $filename ) )
{
$ending = substr( $filename, strpos( $filename, "." ) );
if ( is_array( $type ) )
{
$isTypeOf = false;
foreach( $type as $eachtype )
{
if ( $ending == $eachtype )
{
$isTypeOf = true;
}
}
if ( ! $isTypeOf )
{
$errors[ 'type' ] = $ending;
}
}
elseif ( $type != "" )
{
if ( $ending != $type )
{
$errors[ 'type' ] = $ending;
}
}
$size = getimagesize( $filename );
if ( $size[ 0 ] < $minWidth )
{
$errors[ 'minWidth' ] = $size[ 0 ];
}
if ( $size[ 1 ] < $minHeight )
{
$errors[ 'minHeight' ] = $size[ 1 ];
}
if ( ( $maxWidth > $minWidth ) && ( $size[ 0 ] > $maxWidth ) )
{
$errors[ 'maxWidth' ] = $size[ 0 ];
}
if ( ( $maxHeight > $minHeight ) && ( $size[ 1 ] > $maxHeight ) )
{
$errors[ 'maxHeight' ] = $size[ 1 ];
}
if ( ( $maxFileSize > 0 ) && ( filesize( $filename ) > $maxFileSize ) )
{
$errors[ 'maxFileSize' ] = filesize( $filename );
}
}
else
{
$errors[ 'filename' ] = "not existing";
}
return ( count( $errors ) > 0 ? $errors : null );
}
up
3
Steve
12 years ago
The list of defined IMAGETYPE_ constants is on the manual page for exif_imagetype:

http://www.php.net/manual/en/function.exif-imagetype.php
up
2
shmohel at gmail dot com
16 years ago
Rather than making a lengthy function that essentially runs twice (once as width, once as height) I came up with a helpful function that uses variable variables to set a maximum height/width. Hope someone finds this helpful.

function scaleimage($location, $maxw=NULL, $maxh=NULL){
$img = @getimagesize($location);
if($img){
$w = $img[0];
$h = $img[1];

$dim = array('w','h');
foreach($dim AS $val){
$max = "max{$val}";
if(${$val} > ${$max} && ${$max}){
$alt = ($val == 'w') ? 'h' : 'w';
$ratio = ${$alt} / ${$val};
${$val} = ${$max};
${$alt} = ${$val} * $ratio;
}
}

return("<img src='{$location}' alt='image' width='{$w}' height='{$h}' />");
}
}
up
2
info at personalmis dot com
16 years ago
Seems the various ways people are trying to proportionaly scale an image, up or down, could be more straight forward if one remembers ones algebra.

The formula is, y = mx, where m is the slope of the line. This is the ratio of y:x or m = y/x.

So if...

// max values for x and y
$y_max = 600;
$x_max = 800;

// image size
$y1 = 2000;
$x1 = 3000;

// use width for scaling
if ($x1 > $x_max)
{
// find slope
$m = $y1/$x1;
// set x side to max
$x2 = $x_max;
// set y side to a proportional size
$y2 = $m * $x1;
}

The new image proportionally scaled will be x2 = 800, y2 = 533 (rounded).

To do it from the y side, simply reverse the x's and y's.
up
2
geoff at spacevs dot com
14 years ago
This function returns the width and height of a JPEG image from a string, allowing the dimensions of images stored in a database to be retrieved without writing them to the disk first, or using "imagecreatefromstring" which is very slow in comparison.

<?PHP
function getJPEGImageXY($data) {
$soi = unpack('nmagic/nmarker', $data);
if (
$soi['magic'] != 0xFFD8) return false;
$marker = $soi['marker'];
$data = substr($data, 4);
$done = false;

while(
1) {
if (
strlen($data) === 0) return false;
switch(
$marker) {
case
0xFFC0:
$info = unpack('nlength/Cprecision/nY/nX', $data);
return array(
$info['X'], $info['Y']);
break;

default:
$info = unpack('nlength', $data);
$data = substr($data, $info['length']);
$info = unpack('nmarker', $data);
$marker = $info['marker'];
$data = substr($data, 2);
break;
}
}
}
?>

Doing this 10,000 times takes 0.43 seconds, compared with using imagecreatefromstring/imagesx/imagesy which takes around 1.52 seconds to do the same.

Do not use this instead of getimagesize when dealing with files, getimagesize is much faster coming in at 0.15 seconds.
up
2
cloned at clonedmadman dot com
16 years ago
Well, I am making a script which will resize the image when uploaded, however, i am making a multi-uploader, so i came across with a problem: an efficient way of getting a pictures height and width and storing them in an array to resize later. This is what i came up with:

<?php
$links
= array("test1.jpg", "test2.png");
$sizearray = array();
$count = count($links);
for(
$i = 0; $i < $count; $i++) {
$size = getimagesize($links[$i]);
list(
$width, $height) = $size;
$sizearray[$links[$i]] = array("width" => $width, "height" => $height);
}
print_r($sizearray);
// which will print out: Array ( [test1.jpg] => Array ( [width] => 300 [height] => 400 ) [test2.png] => Array ( [width] => 680 [height] => 100 ) )
?>
up
2
diablx at hotmail dot com
19 years ago
I'm sorry for they other scripts, but I made one mistake about the image resizing... here is a working script !
<?
// Some configuration variables !
$maxWidth = 90;
$maxHeight = 90;
$maxCols = 8;
$webDir = "https://localhost/images/";
$localDir = $_SERVER['DOCUMENT_ROOT']."/images/";

$AutorisedImageType = array ("jpg", "jpeg", "gif", "png");
?>

<center>
<table border='1' cellspacing='5' cellpadding='5' style="border-collapse:collapse; border-style: dotted">
<tr>
<?
// Open localDir
$dh = opendir($localDir);
while (false !== ($filename = readdir($dh))) {
$filesArray[] = $filename;
}

// Display and resize
foreach ($filesArray as $images) {

$ext = substr($images, strpos($images, ".")+1, strlen($images));

if( in_array($ext, $AutorisedImageType) ) {

list($width, $height, $type, $attr) = @getimagesize( $localDir.$images );

$xRatio = $maxWidth / $width;
$yRatio = $maxHeight / $height;

if ( ($width <= $maxWidth) && ($height <= $maxHeight) ) {
$newWidth = $width;
$newHeight = $height;
}
else if (($xRatio * $height) < $maxHeight) {
$newHeight = ceil($xRatio * $height);
$newWidth = $maxWidth;
}
else {
$newWidth = ceil($yRatio * $width);
$newHeight = $maxHeight;
}

if($i == $maxCols) {
echo "</tr><tr>";
$i = 0;
}
echo "<td align='center' valign='middle' width='$maxWidth' height='$maxHeight'><img src='".$webDir.$images."' width='$newWidth' height='$newHeight'></td>";
$i++;
}
}
?>
</tr>
</table>
</center>
up
1
kazuya
10 years ago
i made function img_resize($path,$tmp_name,$new_name,$new_width)
this could be useful.

<?php

$new_file
= img_resize("./img/", "test.jpg","copy_test.jpg",300);
echo
"<IMG src = '$new_file'>";

function
img_resize($path,$tmp_name,$new_name,$new_width){
if (!
file_exists($path.$filename)){
echo
"file not found!";
exit;
}
if (!
is_writable($path)){
echo
"error:permission denied!";
exit;
}
list(
$width, $height) = getimagesize($path . $tmp_name);
$new_height = abs($new_width * $height / $width);
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($path . $tmp_name);
imagecopyresampled($image_p, $image, 0, 0, 0, 0,
$new_width, $new_height, $width, $height);
imagejpeg($image_p, $path . $new_name);
return
$path.$new_name;
}

?>
up
1
alexyam at live dot com
12 years ago
I wanted to use getimagesize() on .SWF files stored in the database as blob data and couldn't find a simple solution, so I created my own.

I am releasing this code under the MIT license to save everyone some time:

<?php
/*
----------------------------------------------------------------------
PHP Blob Data As File Stream v1.0 (C) 2012 Alex Yam <alexyam@live.com>
This code is released under the MIT License.
----------------------------------------------------------------------
[Summary]

A simple class for PHP functions to read and write blob data as a file
using a stream wrapper.

Particularly useful for running getimagesize() to get the width and
height of .SWF Flash files that are stored in the database as blob data.

Tested on PHP 5.3.10.

----------------------------------------------------------------------
[Usage Example]

//Include
include('./blob_data_as_file_stream.php');

//Register the stream wrapper
stream_wrapper_register("BlobDataAsFileStream", "blob_data_as_file_stream");

//Fetch a .SWF file from the Adobe website and store it into a variable.
//Replace this with your own fetch-swf-blob-data-from-database code.
$swf_url = 'http://www.adobe.com/swf/software/flash/about/flashAbout_info_small.swf';
$swf_blob_data = file_get_contents($swf_url);

//Store $swf_blob_data to the data stream
blob_data_as_file_stream::$blob_data_stream = $swf_blob_data;

//Run getimagesize() on the data stream
$swf_info = getimagesize('BlobDataAsFileStream://');
var_dump($swf_info);

----------------------------------------------------------------------
[Usage Output]

array(5) {
[0]=>
int(159)
[1]=>
int(91)
[2]=>
int(13)
[3]=>
string(23) "width="159" height="91""
["mime"]=>
string(29) "application/x-shockwave-flash"
}

*/

class blob_data_as_file_stream {

private static
$blob_data_position = 0;
public static
$blob_data_stream = '';

public static function
stream_open($path,$mode,$options,&$opened_path){
static::
$blob_data_position = 0;
return
true;
}

public static function
stream_seek($seek_offset,$seek_whence){
$blob_data_length = strlen(static::$blob_data_stream);
switch (
$seek_whence) {
case
SEEK_SET:
$new_blob_data_position = $seek_offset;
break;
case
SEEK_CUR:
$new_blob_data_position = static::$blob_data_position+$seek_offset;
break;
case
SEEK_END:
$new_blob_data_position = $blob_data_length+$seek_offset;
break;
default:
return
false;
}
if ((
$new_blob_data_position >= 0) AND ($new_blob_data_position <= $blob_data_length)){
static::
$blob_data_position = $new_blob_data_position;
return
true;
}else{
return
false;
}
}

public static function
stream_tell(){
return static::
$blob_data_position;
}

public static function
stream_read($read_buffer_size){
$read_data = substr(static::$blob_data_stream,static::$blob_data_position,$read_buffer_size);
static::
$blob_data_position += strlen($read_data);
return
$read_data;
}

public static function
stream_write($write_data){
$write_data_length=strlen($write_data);
static::
$blob_data_stream = substr(static::$blob_data_stream,0,static::$blob_data_position).
$write_data.substr(static::$blob_data_stream,static::$blob_data_position+=$write_data_length);
return
$write_data_length;
}

public static function
stream_eof(){
return static::
$blob_data_position >= strlen(static::$blob_data_stream);
}

}
?>
up
1
ajreading at classixshop dot com
18 years ago
A simple piece of code i wrote to proportionally resize an image to a max height and width then display it

<?php
// Max height and width
$max_width = 100;
$max_height = 100;

// Path to your jpeg

$upfile '/path/to/file.jpg';
Header("Content-type: image/jpeg");

$size = GetImageSize($upfile); // Read the size
$width = $size[0];
$height = $size[1];

// Proportionally resize the image to the
// max sizes specified above

$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;
}
// Increase memory limit to support larger files

ini_set('memory_limit', '32M');

// Create the new image!
$src = ImageCreateFromJpeg($upfile);
$dst = ImageCreateTrueColor($tn_width, $tn_height);
ImageCopyResized($dst, $src, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);
ImageJpeg($dst);
// Destroy the images
ImageDestroy($src);
ImageDestroy($dst);
?>
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0
freecorvette at gmail dot com
6 years ago
For some images, using getimagesize() without the second parameter will return the correct info, but when you add the second parameter it will return false. This is most likely a bug (and it has been reported as such), but meanwhile, if you encounter this problem, a workaround is to use exif_read_data().
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0
Jesus Zamora
13 years ago
Returns a array with 4 elements.
The 0 index is the width of the image in pixels.
The 1 index is the height of the image in pixels.
The 2 index is a flag for the image type:

1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(orden de bytes intel), 8 = TIFF(orden de bytes motorola), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF, 15 = WBMP, 16 = XBM.

The 3 index contains ' height="yyy" width="xxx" '
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0
anonymous
15 years ago
Note that if you specify a remote file (via a URL) to check the size of, PHP will first download the remote file to your server.

If you're using this function to check the size of user provided image links, this could constitute a security risk. A malicious user could potentially link to a very large image file and cause PHP to download it. I do not know what, if any, file size limits are in place for the download. But suppose the user provided a link to an image that was several gigabytes in size?

It would be nice if there were a way to limit the size of the download performed by this function. Hopefully there is already a default with some sensible limits.
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0
mail at soylentgreens dot com
18 years ago
How about this for cropping images...

<?php

$imgfile
= "img.jpg";
$cropStartX = 300;
$cropStartY = 250;
$cropW = 200;
$cropH = 200;

// Create two images
$origimg = imagecreatefromjpeg($imgfile);
$cropimg = imagecreatetruecolor($cropW,$cropH);

// Get the original size
list($width, $height) = getimagesize($imgfile);

// Crop
imagecopyresized($cropimg, $origimg, 0, 0, $cropStartX, $cropStartY, $width, $height, $width, $height);

// TODO: write code to save new image
// or, just display it like this:
header("Content-type: image/jpeg");
imagejpeg($cropimg);

// destroy the images
imagedestroy($cropimg);
imagedestroy($origimg);

?>
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-1
Coodiss at w3bbix dot net
19 years ago
Heres a easy way to scale images to the <td> that they are in
*this is broken up so anyone can understand it :)

<?
$imageinfo = getimagesize("images/picture.jpg");

$ix=$imageinfo[0];
$iy=$imageinfo[1];

$widthscale = $ix/175; //<TD> WIDTH
$heightscale = $iy/175; //<TD> HEIGHT

if($widthscale < 1)
$nwidth = $ix*$widthscale;
else
$nwidth = $ix/$widthscale;

if($heightscale < 1)
$nheight = $iy*$heightscale;
else
$nheight = $iy/$heightscale;

?>
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-1
user at example dot net
15 years ago
When validating images, allways check both, image type *AND* file extension!

Because most image types allow sections for comments or other irrelevant data. Those section can be used to infiltrate php code onto the server. If these files are stored as sent by the client, files with a ".php" extension can be executed and do tremendous harm.
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-1
pfarthing at hotmail dot com
16 years ago
Correction: to find $y2 it should be...

// set y side to a proportional size
$y2 = $m * $x_max; // not $x1

Thanks Norbert =)
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