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Vários problemas de upload de fotos


Para o primeiro erro, o array errors está fora do foreah, então você não limpa o erro para cada arquivo, e a consulta a inserir está fora do if que verifica os erros, portanto, é sempre executado

Para o segundo erro o mesmo, a consulta é executada sempre é preciso verificar se o arquivo foi carregado.
<?php

    include_once('connect.php');

    if(isset($_FILES['files'])){
        $filesErrors = 0;
        foreach($_FILES['files']['tmp_name'] as $key => $tmp_name ){
            // MOved errors inside the foreach to clear it each loop
            $errors = array();

            // Check file is uploaded
            if ($_FILES['files']['error'][$key] == UPLOAD_ERR_NO_FILE){
                // Continue with the next file
                continue; 
            }

            $file_name = $key.$_FILES['files']['name'][$key];
            $file_size = $_FILES['files']['size'][$key];
            $file_type = $_FILES['files']['type'][$key];

            if($file_type == "image/gif"){
                $sExt = ".gif";
            } elseif($file_type == "image/jpeg" || $file_type == "image/pjpeg"){
                $sExt = ".jpg";
            } elseif($file_type == "image/png" || $file_type == "image/x-png"){
                $sExt = ".png";
            }
            if (!in_array($sExt, array('.gif','.jpg','.png'))) {
                $errors[] = "Image types alowed are (.gif, .jpg, .png) only!";
            }

            $file_tmp = $_FILES['files']['tmp_name'][$key];
            $file_type = $_FILES['files']['type'][$key];
            if($file_size > 2097152){
                $errors[]='File size must be less than 2 MB';
            }    


            if(empty($errors) == true){
                $desired_dir = "user_data";
                // Execute query inside the errors check
                $query = "INSERT into offers_pics (`offer_id`,`pic_name`,`pic_type`) VALUES ('$user_id','$file_name','$file_type'); ";
                $result = mysqli_query($link,$query);

                if(is_dir($desired_dir) == false){
                    mkdir("$desired_dir", 0700);        // Create directory if it does not exist
                }
                if(is_dir("$desired_dir/".$file_name) == false){
                    move_uploaded_file($file_tmp,"$desired_dir/".$file_name);
                }else{                                  // rename the file if another one exist
                    $new_dir = "$desired_dir/".$file_name.time();
                     rename($file_tmp,$new_dir) ;               
                }
            }else{
                $filesErrors++;
                print_r($errors);
            }
        }

        if ($filesErrors == 0){
            echo 'Success';
        }
    }
?>


<form action="" method="POST" enctype="multipart/form-data">
    <input type="file" name="files[]"> <br/>
    <input type="file" name="files[]"> <br/>
    <input type="file" name="files[]"> <br/>
    <input type="file" name="files[]"> <br/>
    <input type="file" name="files[]" > <br/><br/>
    <input type="submit"/>
</form>