php[world] 2019 — 25 years of PHP

imagescale

(PHP 5 >= 5.5.0, PHP 7)

imagescaleScale an image using the given new width and height

Beschreibung

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.

Hinweis:

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

Parameter-Liste

image

Eine von den verschiedenen Erzeugungsfunktionen wie imagecreatetruecolor() gelieferte Grafikressource.

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.

Achtung

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).

Hinweis: IMG_WEIGHTED4 is not yet supported.

Rückgabewerte

Return the scaled image resource on successIm Fehlerfall wird FALSE zurückgegeben..

Changelog

Version Beschreibung
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.

Siehe auch

imagecopyresized() - Kopieren und Ändern der Größe eines Bild-Teiles imagecopyresampled() - Copy and resize part of an image with resampling

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