我正在使用以下PHP上传脚本上传图像并将其存储到目录中。
我现在希望脚本识别上传图像的类型，如果不image/jpeg，则脚本会在存储之前自动将图像转换为 JPEG 格式。
有人可以告诉我如何实现这一目标吗？
<?php
session_start();
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$title = 'Profile_Pic';
include '../include/config.php';
/**
* uploadFile()
*
* @param string $file_field name of file upload field in html form
* @param bool $check_image check if uploaded file is a valid image
* @param bool $random_name generate random filename for uploaded file
* @return array
*/
function uploadFile ($file_field = null, $check_image = false, $random_name = false) {
//Config Section
//Set file upload path
$path = '../data/user/image/'.$_SESSION['id'].'/'; //with trailing slash
//Set max file size in bytes
$max_size = 1000000;
//Set default file extension whitelist
$whitelist_ext = array('jpg','png','gif');
//Set default file type whitelist
$whitelist_type = array('image/jpeg', 'image/png','image/gif');
//The Validation
// Create an array to hold any output
$out = array('error'=>null);
if (!$file_field) {
$out['error'][] = "Please specify a valid form field name";
}
if (!$path) {
$out['error'][] = "Please specify a valid upload path";
}
if (count($out['error'])>0) {
return $out;
}
//Make sure that there is a file
if((!empty($_FILES[$file_field])) && ($_FILES[$file_field]['error'] == 0)) {
// Get filename
$file_info = pathinfo($_FILES[$file_field]['name']);
$name = $file_info['filename'];
$ext = $file_info['extension'];
//Check file has the right extension
if (!in_array($ext, $whitelist_ext)) {
$out['error'][] = "Invalid file Extension";
}
//Check that the file is of the right type
if (!in_array($_FILES[$file_field]["type"], $whitelist_type)) {
$out['error'][] = "Invalid file Type";
}
//Check that the file is not too big
if ($_FILES[$file_field]["size"] > $max_size) {
$out['error'][] = "File is too big";
}
//If $check image is set as true
if ($check_image) {
if (!getimagesize($_FILES[$file_field]['tmp_name'])) {
$out['error'][] = "Uploaded file is not a valid image";
}
}
//Create full filename including path
if ($random_name) {
// Generate random filename
$tmp = 'default';
if (!$tmp || $tmp == '') {
$out['error'][] = "File must have a name";
}
$newname = $tmp.'.'.$ext;
} else {
$newname = $name.'.'.$ext;
}
//Check if file already exists on server
if (file_exists($path.$newname)) {
$out['error'][] = "A file with this name already exists";
}
if (count($out['error'])>0) {
//The file has not correctly validated
return $out;
}
if (move_uploaded_file($_FILES[$file_field]['tmp_name'], $path.$newname)) {
//Success
$out['filepath'] = $path;
$out['filename'] = $newname;
return $out;
} else {
$out['error'][] = "Server Error!";
}
} else {
$out['error'][] = "No file uploaded";
return $out;
}
} }
?>
把它放在move_uploaded_file之前。
//non JPG, convert to JPG
if($_FILES[$file_field]['type'] != 'image/jpeg') {
// create image resource
$img = imagecreatefromjpeg($_FILES[$file_field]['tmp_name']);
// store to directory
imagejpeg($img, $path.$newname, $quality); // quality is between 0 (worst) to 100 (best), but this is not mandatory, you can skip quality parameter
// free memory associated with image resource
imagedestroy($img);
// success, return filepath and name
$out['filepath'] = $path;
$out['filename'] = $newname;
return $out;
}