how do I upload a file in php by doing a replace of the existing file?

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how do I upload a file in php by doing a replace of the existing file?

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#1 by (3 votes)

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I need to upload a file but this file will have the same name only with different content, I have the code below that does this file upload only when I put a different file with the same name it does not replace it could anyone see what I'm doing wrong

Here I have the html

<html>
<body>

<form action="update.php" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">
</form>

</body>
</html>

php code

<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 50000000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
    && $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}

header("location:upload.php");
?>

php javascript

asked by anonymous 09.05.2016 / 17:32

1 answer

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score 3 · Answer 1

This block of code prevents a file with an already existing name from being overwritten, it sets zero to $uploadOk that is later compared and if zero cancels the if ($uploadOk == 0) { action.

To solve the problem simply remove it.

if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}