这是我在 PHP Web 开发方面的第一次体验，我遇到了一个问题。我制作了一个 HTML 表单来上传可以正常工作的图像。但是，我正在尝试在其中添加一个功能，以便在上传新图像时删除同一链接中的前一个图像。 <?php if(isset($_POST["submit"])) { $a= $_POST['a'] ; if ($a == 'fesectionatimetable'){ $target_dir = "content/timeTables/FE/"; unlink ('content/timeTables/FE/A') ; } $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]); echo '$_FILES["fileToUpload"]["name"]' ; $imageFileType = pathinfo($target_file,PATHINFO_EXTENSION); if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) { echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded."; } } ?> <html> <body> <form action="index.php" method="post" enctype="multipart/form-data"> <h2 style = "color : black ; "> Select image to upload: </h2> <h6 style = "color : black ; "> <input type="file" name="fileToUpload" id="fileToUpload"> </h6> <h6 style = "color : black ; "> <input class="btn btn-primary" href="#" role="button" type="submit" value="Upload Image" name="submit"> </h6> <input type="text" name='a' value="<?php echo $a;?>" style="display:none"> </form> </body> <html>我尝试使用 unlink() 函数，但它没有删除该图像，显示警告 unlink(content/timeTables/FE/A): No such file or directory while there is an image at the same link and of the same name.请指导如何做到这一点。
1 回答
倚天杖
TA贡献1828条经验 获得超3个赞
两件事，一是路径不是动态的，我做到了，二是确保value="<?php echo $a;?>"具有“fesectionatimetable”的值。
<?php
if(isset($_POST["submit"]))
{
$a= $_POST['a'] ;
if ($a == 'fesectionatimetable'){
$target_dir = "content/"; //your path
$old_files = glob('content/*');
foreach($old_files as $file){ // iterate files
if(is_file($file))
unlink($file); // delete file
}
}
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been
uploaded.";
}
}
?>
<html>
<body>
<form action="index.php" method="post" enctype="multipart/form-data">
<h2 style = "color : black ; "> Select image to upload: </h2>
<h6 style = "color : black ; "> <input type="file" name="fileToUpload" id="fileToUpload">
</h6>
<h6 style = "color : black ; "> <input class="btn btn-primary" href="#" role="button"
type="submit" value="Upload Image" name="submit"> </h6>
<input type="text" name='a' value="fesectionatimetable" style="display:none"> //your value
</form>
</body>
<html>
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