What are common reasons for the move_uploaded_file() function in PHP to always return false?

The move_uploaded_file() function in PHP may return false due to insufficient permissions on the destination folder, incorrect file paths, or exceeding the maximum upload file size limit set in php.ini. To solve this issue, ensure that the destination folder has the correct permissions for the web server to write to it, double-check the file paths for accuracy, and adjust the upload_max_filesize and post_max_size settings in php.ini if needed. 

<?php
$uploadDir = 'uploads/';
$uploadFile = $uploadDir . basename($_FILES['file']['name']);

if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadFile)) {
    echo "File is valid, and was successfully uploaded.";
} else {
    echo "Upload failed";
}
?>

Keywords

move_uploaded_file PHP return false file permissions upload directory

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