(PHP 5 >= 5.5.0, PHP 7)
imagecropauto — Crop an image automatically using one of the available modes
$image
[, int $mode = -1
[, float $threshold = .5
[, int $color = -1
]]] )
Automatically crops an image according to the given
mode.
imageРесурс изображения, полученный одной из функций создания изображений, например, такой как imagecreatetruecolor().
modeOne of the following constants:
IMG_CROP_DEFAULTIMG_CROP_TRANSPARENT and if it
fails it falls back to IMG_CROP_SIDES.
IMG_CROP_TRANSPARENTIMG_CROP_BLACKIMG_CROP_WHITEIMG_CROP_SIDESIMG_CROP_THRESHOLDthreshold and
color.
thresholdSpecifies the tolerance in percent to be used while comparing the image color and the color to crop. The method used to calculate the color difference is based on the color distance in the RGB(a) cube.
Used only in IMG_CROP_THRESHOLD mode.
colorEither an RGB color value or a palette index.
Used only in IMG_CROP_THRESHOLD mode.
Returns a cropped image resource on success или FALSE в случае возникновения ошибки.
If no cropping would occur, or the complete image would be cropped, that is
treated as failure, i.e. imagecrop() returns FALSE.
Пример #1 Proper handling of auto-cropping
As noted in the return value section, imagecropauto()
returns FALSE when there is either nothing to crop or the whole image
would be cropped. In this example we have an image resource
$im which should be automatically cropped only if there
is something to crop; otherwise we want to proceed with the original image.
<?php
$cropped = imagecropauto($im, IMG_CROP_DEFAULT);
if ($cropped !== false) { // in case a new image resource was returned
imagedestroy($im); // we destroy the original image
$im = $cropped; // and assign the cropped image to $im
}
?>