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imagegetclip is a function in the PHP GD library that gets cropped fragments of a specified area from an image. It can capture a part of the image by setting the starting coordinates and width and height of the crop area.
However, it should be noted that there is no imagegetclip function in the official PHP document. This name may be a user-defined function or a function provided in a third-party library. This article will combine the standard function imagecrop of the PHP GD library to simulate and implement similar imagegetclip functions, specifically for WebP format image cropping.
PHP has supported the processing of WebP format images since version 7.0, but it must be ensured that the GD library has enabled WebP support.
Example of code to check whether the GD library supports WebP:
<?php
if (imagetypes() & IMG_WEBP) {
echo "GDLibrary supportWebPFormat image";
} else {
echo "GDThe library does not support itWebPFormat image";
}
?>
Below is a complete example of cropping images in WebP format. The code will implement image cropping by simulated imagegetclip function.
<?php
// ReadWebPimage
$src = imagecreatefromwebp("https://gitbox.net/images/sample.webp");
// Define the starting point and width and height of the crop area
$x = 50; // starting pointxcoordinate
$y = 50; // starting pointycoordinate
$width = 200; // Crop width
$height = 150; // Cropping height
// Crop parameters
$crop_rect = [
'x' => $x,
'y' => $y,
'width' => $width,
'height' => $height,
];
// Perform a crop operation
$cropped_image = imagecrop($src, $crop_rect);
if ($cropped_image !== FALSE) {
// 输出裁剪后的image到浏览器
header('Content-Type: image/webp');
imagewebp($cropped_image);
imagedestroy($cropped_image);
} else {
echo "Cropping failed";
}
imagedestroy($src);
?>
If you want to call cropping in the form of imagegetclip , you can wrap it with the following custom function:
<?php
function imagegetclip($image, $x, $y, $width, $height) {
$crop_rect = [
'x' => $x,
'y' => $y,
'width' => $width,
'height' => $height,
];
return imagecrop($image, $crop_rect);
}
// Example of usage
$src = imagecreatefromwebp("https://gitbox.net/images/sample.webp");
$clip = imagegetclip($src, 50, 50, 200, 150);
if ($clip !== FALSE) {
header('Content-Type: image/webp');
imagewebp($clip);
imagedestroy($clip);
} else {
echo "Cropping failed";
}
imagedestroy($src);
?>
The built-in GD library in PHP supports reading and writing operations of WebP format images, ensuring that the GD library enables WebP support.
The imagecrop function is a standard method for cropping images and can be used to crop WebP images.
By encapsulating the imagecrop function, you can create a custom imagegetclip function, which is easy to call repeatedly.
When cropping, the crop area parameters should be set reasonably to avoid exceeding the image boundary.
By mastering the above methods, you can easily realize the cropping operation of WebP format images to meet various image processing needs.
