PHP Manual: imagejpeg

Description

function imagejpeg(GdImage $image, resource|string|null $file = null, int $quality = -1): bool

imagejpeg() creates a JPEG file from the given image.

Parameters

image: A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
file: The path or an open stream resource (which is automatically closed after this function returns) to save the file to. If not set or null, the raw image stream will be output directly.
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).

Return Values

Returns true on success or false on failure.

Caution

However, if libgd fails to output the image, this function returns true.

Errors/Exceptions

Throws a ValueError if quality is invalid.

Changelog

Version	Description
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.

Examples

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);
?>

The above example will output something similar to:

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');
?>

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);
?>

Notes

Note:
If you want to output Progressive JPEGs, you need to set interlacing on with imageinterlace().

imagejpeg