(PHP 5 >= 5.4.0, PHP 7, PHP 8)
imagewebp — Output a WebP image to browser or file
Outputs or saves a WebP version of the given image.
imageUna risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().
fileIl percorso in cui salvare il file. Se non è impostato o è null, viene restituito il flusso raw dell'immagine.
quality
quality ranges from 0 (worst
quality, smaller file) to 100 (best quality, biggest file).
Restituisce true in caso di successo, false in caso di fallimento.
However, if libgd fails to output the image, this function returns true.
Throws a ValueError if quality is invalid.
| Versione | Descrizione |
|---|---|
| 8.4.0 |
Now throws a ValueError if quality is invalid.
|
| 8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
Example #1 Saving an WebP file
<?php
// Create a blank image and add some text
$im = imagecreatetruecolor(120, 20);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 1, 5, 5, 'WebP with PHP', $text_color);
// Save the image
imagewebp($im, 'php.webp');
// Free up memory
imagedestroy($im);
?>To convert a PNG image to Webp, we can do this:
<?php
// Image
$dir = 'img/countries/';
$name = 'brazil.png';
$newName = 'brazil.webp';
// Create and save
$img = imagecreatefrompng($dir . $name);
imagepalettetotruecolor($img);
imagealphablending($img, true);
imagesavealpha($img, true);
imagewebp($img, $dir . $newName, 100);
imagedestroy($img);
?>As of today (end of january 2019), WebP is now supported across all the major browsers (Edge, Chrome, Firefox, Opera).Function to save any image to Webp
public static function webpImage($source, $quality = 100, $removeOld = false)
{
$dir = pathinfo($source, PATHINFO_DIRNAME);
$name = pathinfo($source, PATHINFO_FILENAME);
$destination = $dir . DIRECTORY_SEPARATOR . $name . '.webp';
$info = getimagesize($source);
$isAlpha = false;
if ($info['mime'] == 'image/jpeg')
$image = imagecreatefromjpeg($source);
elseif ($isAlpha = $info['mime'] == 'image/gif') {
$image = imagecreatefromgif($source);
} elseif ($isAlpha = $info['mime'] == 'image/png') {
$image = imagecreatefrompng($source);
} else {
return $source;
}
if ($isAlpha) {
imagepalettetotruecolor($image);
imagealphablending($image, true);
imagesavealpha($image, true);
}
imagewebp($image, $destination, $quality);
if ($removeOld)
unlink($source);
return $destination;
}WebP is not yet supported by Safari, although they are experimenting with it.
Check out https://caniuse.com/#search=webp for the latest support information.