imagescale

(PHP 5 >= 5.5.0, PHP 7)

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

Descrição

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.

Parâmetros

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).

Valor Retornado

Return the scaled image resource on success ou FALSE em caso de falha.

Changelog

Versão Descrição

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.