How can the PHP manual on file upload errors be effectively used to diagnose upload issues?

To diagnose upload issues using the PHP manual on file upload errors, you can refer to the error messages provided by PHP when handling file uploads. These error messages can help identify issues such as file size limitations, file type restrictions, or directory permission problems. By understanding and interpreting these error messages, you can effectively troubleshoot and resolve upload issues. 

if ($_FILES['file']['error'] === UPLOAD_ERR_INI_SIZE) {
    echo "The uploaded file exceeds the upload_max_filesize directive in php.ini.";
} elseif ($_FILES['file']['error'] === UPLOAD_ERR_FORM_SIZE) {
    echo "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.";
} elseif ($_FILES['file']['error'] === UPLOAD_ERR_PARTIAL) {
    echo "The uploaded file was only partially uploaded.";
} elseif ($_FILES['file']['error'] === UPLOAD_ERR_NO_FILE) {
    echo "No file was uploaded.";
} elseif ($_FILES['file']['error'] === UPLOAD_ERR_NO_TMP_DIR) {
    echo "Missing a temporary folder.";
} elseif ($_FILES['file']['error'] === UPLOAD_ERR_CANT_WRITE) {
    echo "Failed to write file to disk.";
} elseif ($_FILES['file']['error'] === UPLOAD_ERR_EXTENSION) {
    echo "A PHP extension stopped the file upload.";
} else {
    // Handle file upload
}

Keywords

PHP manual file upload errors diagnose upload issues error types

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