php 한글 메뉴얼 도움말 검색 사이트 Scale an image using the given new width and height [function.imagescale]

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.

image: imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
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).

Return the scaled image resource on success실패 시 FALSE를 반환합니다.

버전	설명
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.