警告：imagecreatetruecolor（）：第13行的C：\ xampp \ htdocs \ try \ resize.php中的图像尺寸无效
注意：未定义的变量：第14行的C：\ xampp \ htdocs \ try \ resize.php中的2048
警告：imagecopyresampled（）要求参数1为资源，第14行的C：\ xampp \ htdocs \ try \ resize.php中给出布尔值
警告：imagejpeg（）要求参数1为资源，第15行的C：\ xampp \ htdocs \ try \ resize.php中给出布尔值
imagecopyresampled不起作用。
$size = $_POST['max'];
$target = $_FILES['image']['name'];
$new = "resize_".$target;
$type = $_FILES['image']['type'];
$image_name = $_FILES['image']['tmp_name'];
list($originalWidth, $originalHeight) = getimagesize($target);
$ratio = $originalWidth / $originalHeight;
$targetWidth = $targetHeight = min($size, max($originalWidth, $originalHeight));
if ($ratio < 1) {
$targetWidth = $targetHeight * $ratio;
} else {
$targetHeight = $targetWidth / $ratio;
}
$srcWidth = $originalWidth;
$srcHeight = $originalHeight;
$srcX = $srcY = 0;
$targetWidth = $targetHeight = min($originalWidth, $originalHeight, $size);
if ($ratio < 1) {
$srcX = 0;
$srcY = ($originalHeight / 2) - ($originalWidth / 2);
$srcWidth = $srcHeight = $originalWidth;
} else {
$srcY = 0;
$srcX = ($originalWidth / 2) - ($originalHeight / 2);
$srcWidth = $srcHeight = $originalHeight;
}
resize($target,$new,$srcX,$srcY,$targetWidth,$targetHeight,$type,$srcWidth,$srcHeight);
}
<form action='' method="post" enctype="multipart/form-data">
<input type="text" name ="max">
<input type="file" name ="image">
<input type="submit" name="Submit" value="upload">
</form>
这是我的功能
function resize($target,$new,$srcX,$srcY,$targetWidth,$targetHeight,$type,$srcWidth,$srcHeight){
list($originalWidth, $originalHeight) = getimagesize($target);
if($type=="image/jpeg"){
$nen = imagecreatefromjpeg($target);
}
else if($type=="image/gif"){
$nen = imagecreatefromgif($target);
}
else if($type=="image/png"){
$nen = imagecreatefrompng($target);
}
$chen = imagecreatetruecolor($srcX, $srcY);
imagecopyresampled($chen, $nen, 0, 0, $srcX, $srcY, $originalWidth, $originalHeight,$srcWidth, $srcHeight);
imagejpeg($chen,$new,80);
}
答案 0 :(得分：0)
我不确定你的代码试图实现什么，但是有很多错误。
我发现很难相信它是像你说的那样复制图像。
参见内联评论
<?php
if ($_POST) {
// lets set a default value here as MAX field is not set in the form shown below
$size = empty($_POST['max']) ? 500 : $_POST['max'];
$target = $_FILES['image']['name'];
$new = "resize_".$target;
$type = $_FILES['image']['type'];
$image_name = $_FILES['image']['tmp_name'];
// should use image_name as that is the absolute filename, not $target
// list($originalWidth, $originalHeight) = getimagesize($target);
list($originalWidth, $originalHeight) = getimagesize($image_name);
$ratio = $originalWidth / $originalHeight;
$targetWidth = $targetHeight = min($size, max($originalWidth, $originalHeight));
if ($ratio < 1) {
$targetWidth = $targetHeight * $ratio;
} else {
$targetHeight = $targetWidth / $ratio;
}
// why are we setting $srcWidth,$srcHeight,$srcX,$srcY here, if we are overwriting them in the next bit of code
$srcWidth = $originalWidth;
$srcHeight = $originalHeight;
$srcX = $srcY = 0;
$targetWidth = $targetHeight = min($originalWidth, $originalHeight, $size);
// this if/else could be merged with one above as it is based on the same conditions
if ($ratio < 1) {
$srcX = 0;
$srcY = ($originalHeight / 2) - ($originalWidth / 2);
$srcWidth = $srcHeight = $originalWidth;
} else {
$srcY = 0;
$srcX = ($originalWidth / 2) - ($originalHeight / 2);
$srcWidth = $srcHeight = $originalHeight;
}
// $srcX OR $srcY is now set to 0, this causes error in resize function
// should use $image_name as that is the absolute filename, not $target
// resize($target,$new,$srcX,$srcY,$targetWidth,$targetHeight,$type,$srcWidth,$srcHeight);
resize($image_name,$new,$srcX,$srcY,$targetWidth,$targetHeight,$type,$srcWidth,$srcHeight);
}
function resize($target,$new,$srcX,$srcY,$targetWidth,$targetHeight,$type,$srcWidth,$srcHeight){
// Why are we getting the width/height again this could be passed from calling function
list($originalWidth, $originalHeight) = getimagesize($target);
// if($type=="image/jpeg"){
// $nen = imagecreatefromjpeg($target);
// }
// else if($type=="image/gif"){
// $nen = imagecreatefromgif($target);
// }
// else if($type=="image/png"){
// $nen = imagecreatefrompng($target);
// }
// let php decide the image type instead
$nen = imagecreatefromstring(file_get_contents($target));
// srcX or srcY is set to 0 see calling function. we cannot create a image that is 0 in width or height
// i am guessing this should be $targetWidth,$targetHeight instead
// $chen = imagecreatetruecolor($srcX, $srcY);
$chen = imagecreatetruecolor($targetWidth,$targetHeight);
imagecopyresampled($chen, $nen, 0, 0, $srcX, $srcY, $originalWidth, $originalHeight,$srcWidth, $srcHeight);
imagejpeg($chen,$new,80);
}
?>
<form action='' method="post" enctype="multipart/form-data">
<input type="text" name ="max">
<input type="file" name ="image">
<input type="submit" name="Submit" value="upload">
</form>
<强>已更新
我已经将代码重写为应该做我认为你想做的事情
<?php
if ($_POST) {
$original_filename = $_FILES['image']['tmp_name'];
$target_dir = "/temp/"; // change to your target dir with trailing slash
// original filename without the extension, as we are going to convert to jpg anyway
$path_info = pathinfo($_FILES['image']['name']);
$target_filename = $path_info['filename'];
// specify multiple sizes
$target_sizes = array(2000, 500, 300, 200, 100);
resize($original_filename, $target_dir, $target_filename, $target_sizes);
// or just one size
resize($original_filename, $target_dir, $target_filename, 375);
}
function resize($original_filename, $target_dir, $target_filename, $target_sizes){
// convert target_sizes to array
if (! is_array($target_sizes)) {
$target_sizes = array($target_sizes);
}
// get original image dimensions
list($original_w, $original_h) = getimagesize($original_filename);
// load image, let php decide the image type
$original_img = imagecreatefromstring(file_get_contents($original_filename));
foreach ($target_sizes as $target_size) {
// determine max size
$max_size = min($original_w, $original_h, $target_size);
// calculate target size based on ratio
if ($original_w < $original_h) {
$target_h = $max_size;
$ratio = $original_w / $original_h;
$target_w = $target_h * $ratio;
} else {
$target_w = $max_size;
$ratio = $original_h / $original_w;
$target_h = $target_w * $ratio;
}
// create new target image to target dimensions
$target_img = imagecreatetruecolor($target_w, $target_h);
// resize original
imagecopyresampled($target_img, $original_img, 0, 0, 0, 0, $target_w, $target_h, $original_w, $original_h);
// create new filename, with image size suffix
$new_filename = "{$target_dir}/{$target_filename}_{$max_size}.jpg";
// save new image
imagejpeg($target_img, $new_filename, 80);
// destroy image after we are finished using it
imagedestroy($target_img);
}
}
?>
<form action='' method="post" enctype="multipart/form-data">
<input type="text" name ="max">
<input type="file" name ="image">
<input type="submit" name="Submit" value="upload">
</form>