Check whether the file already exists in jquery - php

Question

how can I check if uploaded file using jQuery File Uploader filename already exists. I tried below code and it keeps overriding the first file uploaded. What I wanted is to prevent adding the file. Can someone guide me? Thanks.
Code:
$output_dir = "uploads/";
if(isset($_FILES["myfile"])) {
$ret = array();
// This is for custom errors;
// $custom_error= array();
// $custom_error['jquery-upload-file-error']="File already exists";
// echo json_encode($custom_error);
// die();
$error =$_FILES["myfile"]["error"];
//You need to handle both cases
//If Any browser does not support serializing of multiple files using FormData()
if(!is_array($_FILES["myfile"]["name"])) //single file
{
$fileName = $_FILES["myfile"]["name"];
// check if fileName already exists
if (file_exists($fileName)) {
$fileName = $_FILES["myfile"]["name"];
echo "string";
} else {
move_uploaded_file($_FILES["myfile"]["tmp_name"],$output_dir.$fileName);
$ret[]= $fileName;
}
}
else //Multiple files, file[]
{
$fileCount = count($_FILES["myfile"]["name"]);
for($i=0; $i < $fileCount; $i++)
{
$fileName = $_FILES["myfile"]["name"][$i];
move_uploaded_file($_FILES["myfile"]["tmp_name"][$i],$output_dir.$fileName);
$ret[]= $fileName;
}
}
echo json_encode($ret);
}
JS:
$(document).ready(function() {
var baseurl = window.location.protocol + "//" + window.location.host + "/rmc/";
var newurl = baseurl + 'document_items/upload';
var deleteurl = baseurl + 'document_items/delete';
$("#fileuploader").uploadFile({
url : newurl,
fileName : "myfile",
returnType : "json",
multiple : true, //allow multiple file upload
showFileSize : false, // show file size
acceptFiles : "image/*,application/pdf", // files accepted list
formData: {"name":"Ravi","age":31},
showAbort : true, // display abort button on upload
onSuccess:function(files,data,xhr) {
// $("#status").html("<font color='green'>Upload is success</font>");
},
afterUploadAll:function() {
swal({
title : "Success",
text : "File(s) successfuly uploaded.",
type : "success"
});
},
onError: function(files,status,errMsg)
{
swal({
title : "Error",
text : "Aw Snap! Something went wrong.",
type : "error"
});
},
deleteCallback: function (data, pd) {
for (var i = 0; i < data.length; i++) {
$.post(deleteurl, {op: "delete",name: data[i]},
function (resp,textStatus, jqXHR) {
// Show Message
swal("Success!", "File deleted successfuly!", "success");
});
}
pd.statusbar.hide(); // You choice.
}
});
});

Answer 1

Change your code as below and try again.
if(!is_array($_FILES["myfile"]["name"])) //single file
{
$fileName = $_FILES["myfile"]["name"];
// check if fileName already exists
if (file_exists($output_dir.$fileName)) {
$fileName = $_FILES["myfile"]["name"];
echo "string";
} else {
move_uploaded_file($_FILES["myfile"]["tmp_name"],$output_dir.$fileName);
$ret[]= $fileName;
}
}