Rechercher une fonction PHP

imagescale

Contents

(PHP 5 >= 5.5.0, PHP 7)

imagescale — Scale an image using the given new width and height

Description

imagescale ( resource $image , int $new_width [, int $new_height = -1 [, int $mode = IMG_BILINEAR_FIXED ]] ) : resource

imagescale() scales an image using the given interpolation algorithm.

Note:

Unlike many of other image functions, imagescale() does not modify the passed image; instead, a new image is returned.

PHP: imagescale - Manual Home of Manuel PHP  Contents Haut

Parameters

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

new_width

The width to scale the image to.

new_height

The height to scale the image to. If omitted or negative, the aspect ratio will be preserved.

Caution

You should always provide the height if using PHP 5.5.18 or earlier, or PHP 5.6.2 or earlier, as the aspect ratio calculation was incorrect.

mode

One of IMG_NEAREST_NEIGHBOUR, IMG_BILINEAR_FIXED, IMG_BICUBIC, IMG_BICUBIC_FIXED or anything else (will use two pass).

Note: IMG_WEIGHTED4 is not yet supported.

PHP: imagescale - Manual Home of Manuel PHP  Contents Haut

Return Values

Return the scaled image resource on success or FALSE on failure.

PHP: imagescale - Manual Home of Manuel PHP  Contents Haut

Changelog

Version Description
5.5.19/5.6.3 The calculation of the height if new_height was negative or omitted was fixed; prior to these versions, the aspect ratio was not maintained correctly.

PHP: imagescale - Manual Home of Manuel PHP  Contents Haut

See Also

imagecopyresized() - Copy and resize part of an image imagecopyresampled() - Copy and resize part of an image with resampling

Find a PHP function

English translation

You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.

If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.

Thank you in advance.

Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-imagescale.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut