Usage of php image processing function imagecopyresampled

This article mainly introduces the usage of the PHP image processing function imagecopyresampled, and analyzes the function, parameters, and usage of the imagecopyresampled function in detail with examples. Friends in need can refer to it

Grammar

Copy code The code is as follows:

bool imagecopyresampled ( resource $dst_image , resource $src_image , int $dst_x , int $dst_y , int $src_x , int $src_y , int $dst_w , int $dst_h , int $src_w , int $src_h )

Parameters

dst_image	Target image connection resource.
src_image	Source image connection resource.
dst_x	Target X coordinate point.
dst_y	Target Y coordinate point.
src_x	The X coordinate point of the source.
src_y	The Y coordinate point of the source.
dst_w	Target width.
dst_h	Target height.
src_w	The width of the source image.
src_h	The height of the source image.

Returns TRUE on success, or FALSE on failure.

Case

Case (image cropping):

<?php
  $targ_w = $targ_h = 150; // 设置目标宽度与高度
  $jpeg_quality = 90; // 图片质量90，满分为100
  $src = &#39;demo_files/pool.jpg&#39;; // 被处理的图片
  $img_r = imagecreatefromjpeg($src); // 获取原图
  $dst_r = ImageCreateTrueColor( $targ_w, $targ_h ); // 获取新图
  imagecopyresampled($dst_r,$img_r,0,0,$_POST[&#39;x&#39;],$_POST[&#39;y&#39;],
  $targ_w,$targ_h,$_POST[&#39;w&#39;],$_POST[&#39;h&#39;]); // 目标图 源图 目标X坐标点 目标Y坐标点 源的X坐标点 源的Y坐标点 目标宽度 目标高度 源图宽度 源图高度
  header(&#39;Content-type: image/jpeg&#39;);
  imagejpeg($dst_r,null,$jpeg_quality); // 输出图象到浏览器或文件
?>

Case 2 (resampling) ：

<?php
// 源文件
$filename = &#39;1.jpg&#39;;
// 设置最大宽高
$width = 400;
$height = 400;
// Content type
header(&#39;Content-Type: image/jpeg&#39;);
// 获取新尺寸
list($width_orig, $height_orig) = getimagesize($filename);
$ratio_orig = $width_orig/$height_orig;
if ($width/$height > $ratio_orig) {
  $width = $height*$ratio_orig;
} else {
  $height = $width/$ratio_orig;
}
// 重新取样
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
// 输出
imagejpeg($image_p, null, 100);
?>

Attached are three ideas for uploading pictures

1 .Select the picture, submit the form, the server handles the upload uniformly, save the path

2.Select the picture, upload, get the path, submit the form, save the path

3. Select the picture, upload it to the server, obtain the picture from the server through some means, and save it locally

The above is the entire content of this article, I hope it will be helpful to everyone learning helps.

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