(PHP 5 >= 5.4.0, PHP 7, PHP 8)
imagecreatefromwebp — Erzeugt ein neues Bild aus einer Datei oder URL
imagecreatefromwebp() returns an image identifier representing the image obtained from the given filename. Note that animated WebP files cannot be read.
Wenn fopen wrappers aktiviert ist, kann mit dieser Funktion eine URL als Dateiname verwendet werden. Mehr Details dazu, wie der Dateiname angeben werden muss, sind bei fopen() zu finden. Eine Liste der unterstützten URL-Protokolle, die Fähigkeiten der verschiedenen Wrapper, Hinweise zu deren Verwendung und Informationen zu den eventuell vorhandenen vordefinierten Variablen sind unter Unterstützte Protokolle und Wrapper zu finden.
filenamePath to the WebP image.
Gibt im Erfolgsfall eine Bildobjekt zurück, im Fehlerfall false .
| Version | Beschreibung |
|---|---|
| 8.0.0 | On success, this function returns a GDImage instance now; previously, a resource was returned. |
Beispiel #1 Convert an WebP image to a jpeg image using imagecreatefromwebp()
<?php
// Load the WebP file
$im = imagecreatefromwebp('./example.webp');
// Convert it to a jpeg file with 100% quality
imagejpeg($im, './example.jpeg', 100);
?>PHP GD and WebP support:
Normal WebP (VP8): supported since PHP 5.4
Transparent WebP or alpha transparency (VP8X, VP8L): supported since PHP 7.0
Animated WebP (VP8X): not supported at all.
You can use the images from here https://developers.google.com/speed/webp/gallery2
here https://ezgif.com/help/alternative-animated-image-formats
and here https://developers.google.com/speed/webp/gallery1
Test with imagecreatefromwebp('your-image.webp'); and see the errors.
You can detect animated or transparent webp using this code.
<?php
/**
* Get WebP file info.
*
* @link https://www.php.net/manual/en/function.pack.php unpack format reference.
* @link https://developers.google.com/speed/webp/docs/riff_container WebP document.
* @param string $file
* @return array|false Return associative array if success, return `false` for otherwise.
*/
function webpinfo($file) {
if (!is_file($file)) {
return false;
} else {
$file = realpath($file);
}
$fp = fopen($file, 'rb');
if (!$fp) {
return false;
}
$data = fread($fp, 90);
fclose($fp);
unset($fp);
$header_format = 'A4Riff/' . // get n string
'I1Filesize/' . // get integer (file size but not actual size)
'A4Webp/' . // get n string
'A4Vp/' . // get n string
'A74Chunk';
$header = unpack($header_format, $data);
unset($data, $header_format);
if (!isset($header['Riff']) || strtoupper($header['Riff']) !== 'RIFF') {
return false;
}
if (!isset($header['Webp']) || strtoupper($header['Webp']) !== 'WEBP') {
return false;
}
if (!isset($header['Vp']) || strpos(strtoupper($header['Vp']), 'VP8') === false) {
return false;
}
if (
strpos(strtoupper($header['Chunk']), 'ANIM') !== false ||
strpos(strtoupper($header['Chunk']), 'ANMF') !== false
) {
$header['Animation'] = true;
} else {
$header['Animation'] = false;
}
if (strpos(strtoupper($header['Chunk']), 'ALPH') !== false) {
$header['Alpha'] = true;
} else {
if (strpos(strtoupper($header['Vp']), 'VP8L') !== false) {
// if it is VP8L, I assume that this image will be transparency
// as described in https://developers.google.com/speed/webp/docs/riff_container#simple_file_format_lossless
$header['Alpha'] = true;
} else {
$header['Alpha'] = false;
}
}
unset($header['Chunk']);
return $header;
}// webpinfo
?>
Reference: https://stackoverflow.com/a/68491679/128761
Usage:
<?php
$info = webpinfo('your-image.webp');
if (isset($info['Animation']) && $info['Animation'] === true) {
echo 'It is animated webp.';
}
if (isset($info['Alpha']) && $info['Alpha'] === true) {
echo 'It is transparent webp.';
}
?>