imagecreatefromwebp

(PHP 5 >= 5.4.0, PHP 7)

imagecreatefromwebpTworzy nowy obraz z pliku lub URL

Opis

imagecreatefromwebp ( string $filename ) : resource

imagecreatefromwebp() returns an image identifier representing the image obtained from the given filename.

Wskazówka

Jeśli włączona jest dyrektywa konfiguracyjna fopen wrappers, możliwe jest podanie jako nazwy pliku adresu URL. Zobacz opis funkcji fopen() aby dowiedzieć się jak przekazać nazwę pliku, oraz fopen wrappers aby uzyskać listę obsługiwanych protokołów.

Parametry

filename

Path to the WebP image.

Zwracane wartości

Zwraca identyfikator zasobu obrazu w przypadku powodzenia lub FALSE w przypadku błędów.

Przykłady

Przykład #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($im'./example.jpeg'100);
imagedestroy($im);
?>

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User Contributed Notes 1 note

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kawewong at gmail dot com
2 years ago
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.';
}
?>
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