(PHP 4, PHP 5, PHP 7, PHP 8)
imagejpeg — Invia l'immagine al browser o in un file
imagejpeg() creates a JPEG file from
the given image
.
image
Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().
file
Il percorso in cui salvare il file. Se non è impostato o è null
, viene restituito il flusso raw dell'immagine.
quality
quality
is optional, and ranges from 0 (worst
quality, smaller file) to 100 (best quality, biggest file). The
default (-1
) uses the default IJG quality value (about 75).
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 Outputting a JPEG image to the browser
<?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, 'A Simple Text String', $text_color);
// Set the content type header - in this case image/jpeg
header('Content-Type: image/jpeg');
// Output the image
imagejpeg($im);
// Free up memory
imagedestroy($im);
?>
Il precedente esempio visualizzerà qualcosa simile a:
Example #2 Saving a JPEG image to a 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, 'A Simple Text String', $text_color);
// Save the image as 'simpletext.jpg'
imagejpeg($im, 'simpletext.jpg');
// Free up memory
imagedestroy($im);
?>
Example #3 Outputting the image at 75% quality to the browser
<?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, 'A Simple Text String', $text_color);
// Set the content type header - in this case image/jpeg
header('Content-Type: image/jpeg');
// Skip the file parameter using NULL, then set the quality to 75%
imagejpeg($im, NULL, 75);
// Free up memory
imagedestroy($im);
?>
Nota:
If you want to output Progressive JPEGs, you need to set interlacing on with imageinterlace().