我对Firefox 45有问题。它总是说$_FILES['imagem']是未定义的，是null，即使之前已经从数据库中选择并显示了图像。只有在版本45，我认为这是一个错误。
编辑过程是通过Ajax调用的，由于这个错误，Ajax一直在加载。我想知道是否有办法停止它的进程并在视图中显示错误。
$FILES = $_FILES;
$count = count($_FILES['imagem']['name']) - 2;
for ($i = 0; $i <= $count; $i++) {
$_FILES['imagem']['name'] = $FILES['imagem']['name'][$i];
$_FILES['imagem']['name'] = $FILES['imagem']['name'][$i];
$_FILES['imagem']['type'] = $FILES['imagem']['type'][$i];
$_FILES['imagem']['tmp_name'] = $FILES['imagem']['tmp_name'][$i];
$_FILES['imagem']['error'] = $FILES['imagem']['error'][$i];
$_FILES['imagem']['size'] = $FILES['imagem']['size'][$i];
if (isset($_FILES['imagem']) && $_FILES['imagem']['name'] !== '') {
$config['file_name'] = $id . '_' . $_FILES['imagem']['name'];
$config['upload_path'] = './uploads/carros/imagens/';
$config['allowed_types'] = 'jpg|jpeg|png';
$config['overwrite'] = true;
$imagem = array();
$imagem['id_carro'] = $id;
$imagem['imagem'] = $config['file_name'];
$this->upload->initialize($config);
$this->upload->do_upload('imagem');
$this->Imagens_carro_model->insert($imagem);
}
//
// Apagar caso haja.
if ($this->input->post('nome_imagem')[$i] === '') {
$this->Imagens_carro_model->delete($this->input->post('id_imagem')[$i]);
}
}
以上是生成错误的代码的一部分：
严重性：通知
消息：未定义的索引：imagem
文件名：controllers/Carros.php
线路编号：161
我想我不能用error做任何事情，因为它实际上成功了，而且错误发生在PHP部分，当时它没有找到imagem索引。建议？
如果您从PHP发送精心策划的响应，您可以检查响应，例如，在成功的操作中发送json响应，如（这可能不是问题的准确答案，而是帮助OP处理ajax错误的想法）：
if(somethingWasSuccessfull) {
$response = [
'success' => true,
'message' => 'something was successful!'
];
}
else {
$response = [
'success' => false,
'message' => 'something was not successful!'
];
}
echo json_encode(($response);
因此，当您在客户端收到done/success回调的响应时，您可以检查success的值，例如：
$.ajax(...)
.done(function(response) {
// Request succeeded
// Probably parse the response
if(response.success) {
// Successfull, status code is 200
}
else {
// Not successfull, status code is 200
}
})
.fail(function(response) {
// Error happened..., status code is not 200
})
.always(function(response) {
// Perform some common tasks
});