PHP 通过 JS 发送图片上传时不调整大小
PHP Image Upload Not Resizing When Sent Via JS
我 运行 在 上传 通过 JS 发送到 PHP 的图像时遇到问题。我可以很好地上传图片,但我会先 resize 图片,然后再将其移动到新目的地。我也可以毫无问题地重命名图像。这真的只是 resizing 才是问题所在。
经过大量搜索后,我在 SO 上看到了很多关于此的问题,这就是我到达现在位置的方式,但没有一个能回答这 100 %。如果您知道 question/answer 已经在 SO 上,请 link 我找到正确的文章。
非常感谢任何帮助,谢谢。
这是JS
var test = document.querySelector('#afile');
test.addEventListener('change', function() {
var file = this.files[0];
var fd = new FormData();
fd.append('afile', file);
// These extra params aren't necessary but show that you can include other data.
fd.append('id', burgerId);
var xhr = new XMLHttpRequest();
// why wont this work in the actions directory?
xhr.open('POST', 'actions/upload.php', true);
xhr.upload.onprogress = function(e) {
if (e.lengthComputable) {
var percentComplete = (e.loaded / e.total) * 100;
var uploadProcess = document.getElementById('uploadProcess');
uploadProcess.setAttribute('style', 'width: ' + percentComplete + '%;');
// uploadProcess.innerHTML = parseInt(percentComplete) + '% uploaded';
}
};
xhr.onload = function() {
if (this.status == 200) {
var resp = JSON.parse(this.response);
image = 'img/' + resp.newFileName;
sessionStorage.setItem('burgerLoc', image);
var image = document.createElement('img');
image.src = resp.dataUrl;
document.body.appendChild(image);
};
};
xhr.send(fd);
// upImage(id)
}, false);
这是标记
<input type="file" name="afile" id="afile" accept="image/*"/>
这是PHP
$image = $_FILES['afile']['name'];
$image_tmp = $_FILES['afile']['tmp_name'];
$image_type = $_FILES['afile']['type'];
function getName($str) {
$parts = explode('.',$str);
$imgName = str_replace(' ', '_',$parts[0]);
return $imgName;
}
function getExtension($str) {
$parts = explode('.',$str);
$ext = $parts[1];
return $ext;
}
$image_name = stripslashes($image);
$name = getName($image_name);
$image_ext = getExtension($image_name);
$ext = strtolower($image_ext);
if($ext == 'jpg' || $ext == 'jpeg' ) {
$ext = 'jpg';
$src = imagecreatefromjpeg($image_tmp);
} else if($ext == 'png') {
$src = imagecreatefrompng($image_tmp);
} else {
$src = imagecreatefromgif($image_tmp);
}
$file_content = file_get_contents($image_tmp);
$data_url = 'data:' . $image_type . ';base64,' . base64_encode($file_content);
list($width,$height) = getimagesize($image_tmp);
// width of the main image
$new_width = 748;
$new_height = ($height / $width) * $new_width;
$img_dest = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($img_dest,$src,0,0,0,0,$new_width,$new_height,$width,$height);
// rename the file
$new_file_name = strtolower($_REQUEST['id'] . '.' . $ext);
$new_file_location = '../img/' . $new_file_name;
imagejpeg($img_dest,$new_file_name,100);
move_uploaded_file($image_tmp, $new_file_location);
imagedestroy($src);
imagedestroy($img_dest);
$json = json_encode(array(
'dataUrl' => $data_url,
'extension' => $ext,
'id' => $_REQUEST['id'],
'name' => $image,
'newFileName' => $new_file_name,
'type' => $image_type
));
echo $json;
我可能会尝试在您的 linux 发行版中安装 ImageMagick 并尝试使用此功能调整图像大小
http://php.net/manual/en/imagick.resizeimage.php
我已经在我的网络服务器上复制了您的脚本...我进行了修改并想出了这个。
最重要的修改是我在文件位置使用了准确的路径,我将 tmp 文件移动到一个真实文件,加载那个真实文件,调整那个真实文件的大小,而不是尝试用它来处理tmp 上传的文件。
PHP:
<?php
$image = $_FILES['afile']['name'];
$image_tmp = $_FILES['afile']['tmp_name'];
$image_type = $_FILES['afile']['type'];
function getName($str) {
$parts = explode('.',$str);
$imgName = str_replace(' ', '_',$parts[0]);
return $imgName;
}
function getExtension($str) {
$parts = explode('.',$str);
$ext = $parts[1];
return $ext;
}
$image_name = stripslashes($image);
$name = getName($image_name);
$image_ext = getExtension($image_name);
$ext = strtolower($image_ext);
$outputfolder = "/var/www/html/wp-content/";
$new_file_name = strtolower($_REQUEST['id'] . '.' . $ext);
$new_file_location = $outputfolder.$new_file_name;
move_uploaded_file($image_tmp, $new_file_location);
if($ext == 'jpg' || $ext == 'jpeg' ) {
$ext = 'jpg';
$src = imagecreatefromjpeg($new_file_location);
} else if($ext == 'png') {
$src = imagecreatefrompng($new_file_location);
} else {
$src = imagecreatefromgif($new_file_location);
}
list($width,$height) = getimagesize($new_file_location);
// width of the main image
$new_width = 748;
$new_height = ($height / $width) * $new_width;
$img_dest = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($img_dest,$src,0,0,0,0,$new_width,$new_height,$width,$height);
$resizedLocation = $outputfolder."resized_".$new_file_name;
imagejpeg($img_dest,$resizedLocation,100);
imagedestroy($src);
imagedestroy($img_dest);
$file_content = file_get_contents($resizedLocation);
$data_url = 'data:image/jpeg;base64,' . base64_encode($file_content);
$json = json_encode(array(
'dataUrl' => $data_url,
'extension' => $ext,
'id' => $_REQUEST['id'],
'name' => $image,
'newFileName' => $new_file_name,
'type' => $image_type
));
echo $json;
?>
您的 HTML/JS 保持不变。
现在这对我来说完美无缺,你唯一需要确保的是
$outputfolder 可由 linux 用户写入,执行 php 脚本的网络服务器正在其下运行(通常是网络数据...)
我的网络服务器:
- CentOS Linux 发行版 7.0.1406(核心)
- php.x86_64 5.4.16-23.el7_0.3
- 阿帕奇 x86_64 2.4.6
我 运行 在 上传 通过 JS 发送到 PHP 的图像时遇到问题。我可以很好地上传图片,但我会先 resize 图片,然后再将其移动到新目的地。我也可以毫无问题地重命名图像。这真的只是 resizing 才是问题所在。
经过大量搜索后,我在 SO 上看到了很多关于此的问题,这就是我到达现在位置的方式,但没有一个能回答这 100 %。如果您知道 question/answer 已经在 SO 上,请 link 我找到正确的文章。
非常感谢任何帮助,谢谢。
这是JS
var test = document.querySelector('#afile');
test.addEventListener('change', function() {
var file = this.files[0];
var fd = new FormData();
fd.append('afile', file);
// These extra params aren't necessary but show that you can include other data.
fd.append('id', burgerId);
var xhr = new XMLHttpRequest();
// why wont this work in the actions directory?
xhr.open('POST', 'actions/upload.php', true);
xhr.upload.onprogress = function(e) {
if (e.lengthComputable) {
var percentComplete = (e.loaded / e.total) * 100;
var uploadProcess = document.getElementById('uploadProcess');
uploadProcess.setAttribute('style', 'width: ' + percentComplete + '%;');
// uploadProcess.innerHTML = parseInt(percentComplete) + '% uploaded';
}
};
xhr.onload = function() {
if (this.status == 200) {
var resp = JSON.parse(this.response);
image = 'img/' + resp.newFileName;
sessionStorage.setItem('burgerLoc', image);
var image = document.createElement('img');
image.src = resp.dataUrl;
document.body.appendChild(image);
};
};
xhr.send(fd);
// upImage(id)
}, false);
这是标记
<input type="file" name="afile" id="afile" accept="image/*"/>
这是PHP
$image = $_FILES['afile']['name'];
$image_tmp = $_FILES['afile']['tmp_name'];
$image_type = $_FILES['afile']['type'];
function getName($str) {
$parts = explode('.',$str);
$imgName = str_replace(' ', '_',$parts[0]);
return $imgName;
}
function getExtension($str) {
$parts = explode('.',$str);
$ext = $parts[1];
return $ext;
}
$image_name = stripslashes($image);
$name = getName($image_name);
$image_ext = getExtension($image_name);
$ext = strtolower($image_ext);
if($ext == 'jpg' || $ext == 'jpeg' ) {
$ext = 'jpg';
$src = imagecreatefromjpeg($image_tmp);
} else if($ext == 'png') {
$src = imagecreatefrompng($image_tmp);
} else {
$src = imagecreatefromgif($image_tmp);
}
$file_content = file_get_contents($image_tmp);
$data_url = 'data:' . $image_type . ';base64,' . base64_encode($file_content);
list($width,$height) = getimagesize($image_tmp);
// width of the main image
$new_width = 748;
$new_height = ($height / $width) * $new_width;
$img_dest = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($img_dest,$src,0,0,0,0,$new_width,$new_height,$width,$height);
// rename the file
$new_file_name = strtolower($_REQUEST['id'] . '.' . $ext);
$new_file_location = '../img/' . $new_file_name;
imagejpeg($img_dest,$new_file_name,100);
move_uploaded_file($image_tmp, $new_file_location);
imagedestroy($src);
imagedestroy($img_dest);
$json = json_encode(array(
'dataUrl' => $data_url,
'extension' => $ext,
'id' => $_REQUEST['id'],
'name' => $image,
'newFileName' => $new_file_name,
'type' => $image_type
));
echo $json;
我可能会尝试在您的 linux 发行版中安装 ImageMagick 并尝试使用此功能调整图像大小
http://php.net/manual/en/imagick.resizeimage.php
我已经在我的网络服务器上复制了您的脚本...我进行了修改并想出了这个。
最重要的修改是我在文件位置使用了准确的路径,我将 tmp 文件移动到一个真实文件,加载那个真实文件,调整那个真实文件的大小,而不是尝试用它来处理tmp 上传的文件。
PHP:
<?php
$image = $_FILES['afile']['name'];
$image_tmp = $_FILES['afile']['tmp_name'];
$image_type = $_FILES['afile']['type'];
function getName($str) {
$parts = explode('.',$str);
$imgName = str_replace(' ', '_',$parts[0]);
return $imgName;
}
function getExtension($str) {
$parts = explode('.',$str);
$ext = $parts[1];
return $ext;
}
$image_name = stripslashes($image);
$name = getName($image_name);
$image_ext = getExtension($image_name);
$ext = strtolower($image_ext);
$outputfolder = "/var/www/html/wp-content/";
$new_file_name = strtolower($_REQUEST['id'] . '.' . $ext);
$new_file_location = $outputfolder.$new_file_name;
move_uploaded_file($image_tmp, $new_file_location);
if($ext == 'jpg' || $ext == 'jpeg' ) {
$ext = 'jpg';
$src = imagecreatefromjpeg($new_file_location);
} else if($ext == 'png') {
$src = imagecreatefrompng($new_file_location);
} else {
$src = imagecreatefromgif($new_file_location);
}
list($width,$height) = getimagesize($new_file_location);
// width of the main image
$new_width = 748;
$new_height = ($height / $width) * $new_width;
$img_dest = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($img_dest,$src,0,0,0,0,$new_width,$new_height,$width,$height);
$resizedLocation = $outputfolder."resized_".$new_file_name;
imagejpeg($img_dest,$resizedLocation,100);
imagedestroy($src);
imagedestroy($img_dest);
$file_content = file_get_contents($resizedLocation);
$data_url = 'data:image/jpeg;base64,' . base64_encode($file_content);
$json = json_encode(array(
'dataUrl' => $data_url,
'extension' => $ext,
'id' => $_REQUEST['id'],
'name' => $image,
'newFileName' => $new_file_name,
'type' => $image_type
));
echo $json;
?>
您的 HTML/JS 保持不变。
现在这对我来说完美无缺,你唯一需要确保的是 $outputfolder 可由 linux 用户写入,执行 php 脚本的网络服务器正在其下运行(通常是网络数据...)
我的网络服务器:
- CentOS Linux 发行版 7.0.1406(核心)
- php.x86_64 5.4.16-23.el7_0.3
- 阿帕奇 x86_64 2.4.6