imagescale

(PHP 5 >= 5.5.0, PHP 7)

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

Beschreibung

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

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

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).

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.