PHP代码中的多个调整大小图像不起作用
我是PHP的初学者。我尝试了很多代码用于图像调整大小仅适用于单个图像上传，但我想进行多个图像调整大小。
以下是我在Google上搜索的代码之一。
多张图片上传代码无效
<?php
if (isset($_POST['submit'])) {
for($i=0;$i<count($_FILES['image']['name']);$i++){
function resize($width, $height){
/* Get original image x y*/
list($w, $h) = getimagesize($_FILES['image']['tmp_name'][$i]);
/* calculate new image size with ratio */
$ratio = max($width/$w, $height/$h);
$h = ceil($height / $ratio);
$x = ($w - $width / $ratio) / 2;
$w = ceil($width / $ratio);
/* new file name */
$path = 'inder/'.$width.'x'.$height.'_'.$_FILES['image']['name'][$i];
/* read binary data from image file */
$imgString = file_get_contents($_FILES['image']['tmp_name'][$i]);
/* create image from string */
$image = imagecreatefromstring($imgString);
$tmp = imagecreatetruecolor($width, $height);
imagecopyresampled($tmp, $image,
0, 0,
$x, 0,
$width, $height,
$w, $h);
/* Save image */
switch ($_FILES['image']['type'][$i]) {
case 'image/jpeg':
imagejpeg($tmp, $path, 100);
break;
case 'image/png':
imagepng($tmp, $path, 0);
break;
case 'image/gif':
imagegif($tmp, $path);
break;
default:
exit;
break;
}
return $path;
/* cleanup memory */
imagedestroy($image);
imagedestroy($tmp);
}
// settings
$max_file_size = 50000*50000; // 200kb
$valid_exts = array('jpeg', 'jpg', 'png', 'gif');
// thumbnail sizes
$sizes = array(250 => 250);
if( $_FILES['image']['size'][$i] < $max_file_size ){
// get file extension
$ext = strtolower(pathinfo($_FILES['image']['name'][$i], PATHINFO_EXTENSION));
if (in_array($ext, $valid_exts)) {
/* resize image */
foreach ($sizes as $w => $h) {
$files[] = resize($w, $h);
}
} else {
$msg = 'Unsupported file';
}
} else{
$msg = 'Please upload image smaller than 200KB';
}
}
}
?>
单张图片上传代码正常工作
<?php
if (isset($_POST['submit'])) {
function resize($width, $height){
/* Get original image x y*/
list($w, $h) = getimagesize($_FILES['image']['tmp_name']);
/* calculate new image size with ratio */
$ratio = max($width/$w, $height/$h);
$h = ceil($height / $ratio);
$x = ($w - $width / $ratio) / 2;
$w = ceil($width / $ratio);
/* new file name */
$path = 'inder/'.$width.'x'.$height.'_'.$_FILES['image']['name'];
/* read binary data from image file */
$imgString = file_get_contents($_FILES['image']['tmp_name']);
/* create image from string */
$image = imagecreatefromstring($imgString);
$tmp = imagecreatetruecolor($width, $height);
imagecopyresampled($tmp, $image,
0, 0,
$x, 0,
$width, $height,
$w, $h);
/* Save image */
switch ($_FILES['image']['type']) {
case 'image/jpeg':
imagejpeg($tmp, $path, 100);
break;
case 'image/png':
imagepng($tmp, $path, 0);
break;
case 'image/gif':
imagegif($tmp, $path);
break;
default:
exit;
break;
}
return $path;
/* cleanup memory */
imagedestroy($image);
imagedestroy($tmp);
}
// settings
$max_file_size = 50000*50000; // 200kb
$valid_exts = array('jpeg', 'jpg', 'png', 'gif');
// thumbnail sizes
$sizes = array(250 => 250);
if( $_FILES['image']['size'] < $max_file_size ){
// get file extension
$ext = strtolower(pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION));
if (in_array($ext, $valid_exts)) {
/* resize image */
foreach ($sizes as $w => $h) {
$files[] = resize($w, $h);
}
} else {
$msg = 'Unsupported file';
}
} else{
$msg = 'Please upload image smaller than 200KB';
}
}
?>
我尝试 for loop 进行图片上传。
更新：错误显示： -
1 个答案:
答案 0 :(得分：1)
我认为这个问题可能是$i<count($_FILES['image']['name'])〜在处理数组时我通常会从计数中扣除1 - 所以那就是$i<count( $_FILES['image']['name'] ) - 1;
我修改了一下并重新编写了resize函数，以便它不会在循环内重复声明 - 这本身就会导致错误。
顺便提一下，如果最大值为200Kb，那么您所拥有的最大文件大小计算似乎不正确 - 因为50,000 x 50,000大约是2.3Gb我认为所以我在204800 - [ 1024 x 200 ]
<?php
function uploaderror( $code ){
switch( $code ) {
case UPLOAD_ERR_INI_SIZE: return 'The uploaded file exceeds the upload_max_filesize directive in php.ini';
case UPLOAD_ERR_FORM_SIZE: return 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form';
case UPLOAD_ERR_PARTIAL: return 'The uploaded file was only partially uploaded';
case UPLOAD_ERR_NO_FILE: return 'No file was uploaded';
case UPLOAD_ERR_NO_TMP_DIR: return 'Missing a temporary folder';
case UPLOAD_ERR_CANT_WRITE: return 'Failed to write file to disk';
case UPLOAD_ERR_EXTENSION: return 'File upload stopped by extension';
default: return 'Unknown upload error';
}
}
function resize( $tmp, $name, $type, $origwidth, $origheight, $newwidth, $newheight ){
/* calculate new image size with ratio */
$ratio = max( $newwidth / $origwidth, $newheight / $origheight );
$h = ceil( $newheight / $ratio );
$x = ( $origwidth - $newwidth / $ratio ) / 2;
$w = ceil( $newwidth / $ratio );
/* new file name */
$path = __DIR__ . '/inder/'.$newwidth.'x'.$newheight.'_'.$name;
/* read binary data from image file */
$imgString = file_get_contents( $tmp );
/* create image from string */
$image = imagecreatefromstring( $imgString );
$tmp = imagecreatetruecolor( $newwidth, $newheight );
imagecopyresampled( $tmp, $image, 0, 0, $x, 0, $newwidth, $newheight, $w, $h );
/* Save image */
switch( $type ) {
case 'image/jpeg': imagejpeg( $tmp, $path, 100 ); break;
case 'image/png': imagepng( $tmp, $path, 0 ); break;
case 'image/gif': imagegif( $tmp, $path ); break;
default:
imagedestroy($image);
imagedestroy($tmp);
return false;
}
/* cleanup memory */
imagedestroy($image);
imagedestroy($tmp);
return $path;
}
$fieldname='image';
$max_file_size = 204800; // 200kb
$valid_exts = array('jpeg', 'jpg', 'png', 'gif');
$sizes = (object)array('width'=>250,'height'=>250);
$errors = array();
$files = array();
if( $_SERVER['REQUEST_METHOD']=='POST' && !empty( $_FILES ) ){
foreach( $_FILES[ $fieldname ]['name'] as $i => $name ) {
try{
if( !empty( $_FILES[ $fieldname ]['tmp_name'][$i] ) ) {
$name = $_FILES[ $fieldname ]['name'][$i];
$size = $_FILES[ $fieldname ]['size'][$i];
$type = $_FILES[ $fieldname ]['type'][$i];
$tmp = $_FILES[ $fieldname ]['tmp_name'][$i];
$error = $_FILES[ $fieldname ]['error'][$i];
$ext=strtolower( pathinfo( $name, PATHINFO_EXTENSION ) );
$filesize=filesize( $tmp );
list( $w,$h,$t,$a )=getimagesize( $tmp );
if( !$w or !$h )throw new Exception( sprintf( 'Not an image: %s',$name ) );
if( $error == UPLOAD_ERR_OK ){
if( is_uploaded_file( $tmp ) ){
if( !in_array( $ext, $valid_exts ) ) throw new Exception( sprintf('Invalid file extension: %s', $ext ) );
if( $size > $max_file_size ) throw new Exception( sprintf( 'File is too large: %u', $size ) );
/* resize image */
$result = resize( $tmp, $name, $type, $w, $h, $sizes->width, $sizes->height );
if( !$result )throw new Exception( sprintf( 'error resizing %s',$name ) );
$files[] = $result;
} else {
throw new Exception('Possible file upload attack');
}
} else {
throw new Exception( uploaderror( $error ) );
}
} else {
throw new Exception( sprintf('"tmp_name" for %s is empty - unable to upload correctly', $_FILES[ $fieldname ]['name'][$i] ) );
}
}catch( Exception $e ){
$errors[]=$e->getMessage();
continue;
}
}
}
?>
<!doctype html>
<html>
<head>
<meta charset='utf-8' />
<title>Multiple File upload</title>
</head>
<body>
<form name='usrupload' method='post' enctype='multipart/form-data'>
<input type='hidden' name='MAX_FILE_SIZE' value='<?php echo $max_file_size;?>' />
<input type='file' name='image[]' multiple />
<input type='submit' />
</form>
<?php
if( $_SERVER['REQUEST_METHOD']=='POST' ){
if( !empty( $files ) ){
printf('<h2>Files uploaded & resized</h2>');
foreach( $files as $file ){
printf( '%s<br />',$file );
}
}
if( !empty( $errors ) ){
printf('<h2>Errors</h2>');
foreach( $errors as $error ){
printf('%s<br />',$error);
}
}
}
?>
</body>
</html>
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