php - ctype_alphaは改行時にFALSEを返します

Question

textareaフィールドを介して送信されたデータにctype_alphaを使用したいのですが、データは特殊文字を含まないアルファベットのみである必要があります。FALSE改行時に戻るときに、どうすればそれを使用できますか？

これはHTMLコードです：

<?php
include_once('../../header.php');
include_once('../../model/contribution/create_new_tag_script.php');
?>

<form action="" method="post">
    <input type="text" name="tag_name" value="" />
    <textarea maxlength="60" type="text"  name="tag_description" value=""></textarea>
    <input type="submit" name="tag_name_submit" value="Submit the New Tag" />
</form>


<?php
include_once('../../footer.php');
?>

これはPHPコードです：

<?php
# This script does get included into the document create_new_tag_from.php




    if(isset($_POST['tag_name_submit'])){
    $tag_name_submit = $_POST['tag_name_submit'];
    }

    if(!empty($_POST['tag_name'])){
    $tag_name = strip_tags($_POST['tag_name']);
    }

    if(!empty($_POST['tag_description'])){
    $tag_description = strip_tags($_POST['tag_description']);
    }


if(isset($tag_name_submit)){



    # The Validation of User Entered Data
    # Do validate for solely alphabetic characters with ctype_alpha

    # ctype_alpha($tag_name) && 
    if(ctype_alpha($tag_description)){
        $tag_name = strtolower($tag_name);
        $tag_description = strtolower($tag_description);


    # The Insertion Into the Database
    $db_connect = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);



    $sql_query = sprintf(

            "set @newid = convert(

              ( select 
               max(convert( (substring(tag_id, 2)) , unsigned integer))+1
               from tags), char(10) );

                set @newid = if(length(@newid) = 1, concat('0', @newid), @newid);
                set @newid = concat('c', @newid);

                INSERT INTO tags (tag_id, tag_name, tag_description, added_by_user_id,
                                creation_date, last_edited)
                VALUES (@newid, '%s', '%s', 7, now(), '0')",

                mysqli_real_escape_string($db_connect, $tag_name),
                mysqli_real_escape_string($db_connect, $tag_description)


            );

    $sql_query_run = mysqli_multi_query($db_connect, $sql_query);

    # Print Test to See If It Works
    echo "works_ ";
    echo $tag_name . "_ ";
    echo $tag_description . "_ ";


        } else { # End of the Validation
            echo "The entered data must be in alphabetic characters.";
        }

}



?>