There are 2 configs in php.ini related to upload process:
- post_max_size
- upload_max_filesize
If the size of your post is over post_max_size, system could cause an error without any warning and $_POST could be empty for no reason. So it’s important to check post size before you start to process a form submit.
Helper functions:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 |
function return_bytes($val) { $val = trim($val); if (is_numeric($val)) return $val; $last = strtolower($val[strlen($val)-1]); $val = substr($val, 0, -1); // necessary since PHP 7.1; otherwise optional switch($last) { // The 'G' modifier is available since PHP 5.1.0 case 'g': $val *= 1024; case 'm': $val *= 1024; case 'k': $val *= 1024; } return $val; } public function check_post_size(){ $max_size = $this->return_bytes(ini_get('post_max_size')); $content_length = $_SERVER['CONTENT_LENGTH']; if($content_length > $max_size){ $this->err = '送出的資料大於限制: ' . ini_get('post_max_size'); return false; } return true; } public function check_upload_error($field_name){ $file = $_FILES[$field_name]; if($file['error'] != 0){ $this->err = $this->get_upload_error($file['error']); return false; } return true; } function get_upload_error($error){ $err = ''; switch($error){ case 1: $err = '上傳的檔案超過限制:' . ini_get('upload_max_filesize'); break; case 2: $err = 'File size exceed the limit(2)'; break; case 3: $err = 'File is not uploaded completely'; break; case 4: $err = 'Please upload a file'; break; case 6: $err = 'Missing a temporary folder'; break; case 7: $err = 'Failed to write file to disk'; break; case 8: $err = 'Unknown extension issue'; break; case 9://Added by Rex $err = 'Custom Error'; break; } return $err; } |
Other programming issue:
|
1 2 3 4 5 6 7 8 |
//If related to Upload_lib.php, make sure following values are big enough $config['max_size'] = '9999'; $config['max_width'] = '9999'; $config['max_height'] = '9999'; //Image_handler.php //If memory is not enough, this line could cause error: imagecreatefromjpeg($file); |