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php - 如果没有上传文件，则停止 file_exist 调用错误

问题描述

当用户没有选择将文件作为表单的一部分上传时，是否有一种简单的方法可以阻止 file_exists 返回 true？

我有以下代码；

if (isset($_FILES["tipimage"]) && $_FILES["tipimage"]["error"] == 0) {
    $allowed = array("jpg" => "image/jpg", "jpeg" => "image/jpeg", "gif" => "image/gif", "png" => "image/png");
    $filename = $_FILES["tipimage"]["name"];
    $filetype = $_FILES["tipimage"]["type"];
    $targetDir = "uploads/";
    $targetFilePath = $targetDir . $filename;

    // Verify file extension
    $ext = pathinfo($filename, PATHINFO_EXTENSION);
    if(!array_key_exists($ext, $allowed)) {
        $error .= "Invalid File Format<br>";
    } 
}

if (file_exists("uploads/" . $_FILES["tipimage"]["name"])) {
    $error .= "The File " . $_FILES["tipimage"]["name"] . " already exists.<br>";
} else if (move_uploaded_file($_FILES["tipimage"]["tmp_name"], $targetFilePath)) {
    $successmsg .= "<div class='alert alert-success'>Image - " . $filename . " - Uploaded Successfully!</div>";
}

标签： php

解决方案

我不确定您的else状况，因为您使用了if和else if。如果可能的话，我会选择多个以避免错误。

// Check if the file exists
if(file_exists("uploads/" . $_FILES["tipimage"]["name"])){
    $error .= "The File " . $_FILES["tipimage"]["name"] . " already exists.<br>";
} 

// Upload file
if(!move_uploaded_file($_FILES["tipimage"]["tmp_name"], 'uploads/' . $_FILES["file_upload"]["name"])){
    die('Error uploading file - check destination is writeable.');
}
 $successmsg .= "<div class='alert alert-success'>Image - " . $filename . " - Uploaded Successfully!</div>";

// Check for errors
if($_FILES["file_upload"]["error"] > 0){
    die('An error ocurred when uploading.');
}

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