使用php imagejpeg创建缩略图 - 获取错误“无法打开流：权限被拒绝”

Question

I am trying to create thumbnail of previously uploaded images using this function.

Original images are uploaded to mysite/used_uploads and thumbnails should be created at mysite/used_uploads_thb.

The thumbnail function is triggered directly after upload of the original.

I have also changed permissions with the directory, as follows, but the problem persists.

chmod("used_uploads_thb", 0777);

The directories are as follows:

mysite/used_uploads

mysite/used_uploads_thb

This is the whole script. The last step is giving the above error.

<?php
$src = substr($filePath, 1);

//$src example: used_uploads/252-558ec2e5dc45c-alfa-romeo-giulia - 2.jpg
chmod("used_uploads_thb", 0777);

$dest = '/used_uploads_thb';
$desired_width="100";

function make_thumb($src, $dest, $desired_width) {

/* read the source image */    
    $source_image = imagecreatefromjpeg($src);

$width = imagesx($source_image);
$height = imagesy($source_image);
/* find the "desired height" of this thumbnail, relative to the desired width  */
$desired_height = floor($height * ($desired_width / $width));

/* create a new, "virtual" image */
$virtual_image = imagecreatetruecolor($desired_width, $desired_height);

/* copy source image at a resized size */
imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);

/* create the physical thumbnail image to its destination */
imagejpeg($virtual_image, $dest);
                  print_r(error_get_last());              
}

make_thumb($src, $dest, $desired_width);
?>

This is the error message:

Array
(
[type] => 2
[message] => imagejpeg(/used_uploads_thb): failed to open stream:    Permission denied
[file] => /Applications/MAMP/htdocs/SiteCar/used_thumbnail.php
[line] => 26
)

I appreciate your help.

Answer 1

Just for the record.

The issue was with the destination path for the thumbnail. My original code had only the directory. I was wrongly assuming that the name would be the same as the original file and would be automatically created. Not so.

So here it is the working code: The preg_replace is there only because I am placing the thumbnails in a separate directory to the original image.

<?php
$src = $new_name = $filePath;
$new_name = preg_replace('/used_uploads\/(.*)$/', '$1', $new_name);
$src = $_SERVER['DOCUMENT_ROOT'] . $src;
$dest = 'used_uploads_thb'. $new_name;
$desired_width="100";


function make_thumb($src, $dest, $desired_width) {

/* read the source image */    
    $source_image = imagecreatefromjpeg($src);

$width = imagesx($source_image);
$height = imagesy($source_image);
/* find the "desired height" of this thumbnail, relative to the desired width  */
$desired_height = floor($height * ($desired_width / $width));

/* create a new, "virtual" image */
$virtual_image = imagecreatetruecolor($desired_width, $desired_height);

/* copy source image at a resized size */
imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);

/* create the physical thumbnail image to its destination */

imagejpeg($virtual_image,$dest);
    //print_r(error_get_last());
}

 make_thumb($src, $dest, $desired_width);
?>