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フォーム フィールドを最小長と最大長で検証したいと考えています。

空かどうか、または電子メールアドレスが無効かどうかは、すでに検証しています。各フィールドに長さの要件を追加したい (最小長と最大長)。これのベストプラクティスは何ですか？

process.php私のファイルからの抜粋：

require_once('includes/phpmailer-config.php');
require_once('includes/phpmailer/class.phpmailer.php');

// other stuff here

// Validate each form field
if (empty($name)) {
    $errors['name'] = MIA_NAME;    // Error message for missing name
}
if (empty($email)) {
    $errors['email'] = MIA_ADDR;   // Error message for missing email address
}
elseif (!(filter_var($email, FILTER_VALIDATE_EMAIL))) {
    $errors['email'] = INV_ADDR;   // Error message for invalid email address
}
if (empty($message)) {
    $errors['message'] = MIA_MESG; // Error message for missing message
}

phpmailer-config.php私のファイルからの抜粋：

// other stuff here

define ('MIA_NAME', 'A Full Name is Required.');       // Error for missing name
define ('LG_NAME',  {5,50}');                          // Min. length: 5, Max. length: 50
define ('TS_NAME',  'Name is too Short.');             // Error for name too short 
define ('TL_NAME',  'Name is too Long.');              // Error for name too long

define ('MIA_ADDR', 'An Email Address is Required.');  // Error for missing email address
define ('LG_ADDR',  {8,50}');                          // Min. length: 8, Max. length: 50
define ('TS_ADDR',  'Email Address is too Short.');    // Error for email too short 
define ('TL_ADDR',  'Email Address is too Long.');     // Error for email too long
define ('INV_ADDR', 'We need a valid email address.'); // Error for invalid email address

define ('MIA_MESG', 'A Message is Required.');         // Error message for missing message
define ('LG_MESG',  {20,7500}');                       // Min. length: 20, Max. length: 7500
define ('TS_MESG',  'Message is too Short.');          // Error for message too short 
define ('TL_MESG',  'Message is too Long.');           // Error for message too long





編集：アマルの答えのおかげで、私が最終的に使用したものは次のとおりです。

からの抜粋phpmailer-config.php:

define ('MIA_NAME', 'A Full Name is Required.');       // Error for missing name
define ('MIN_NAME', 5);                                // Min. length for name 
define ('MAX_NAME', 50);                               // Max. length for name
define ('TS_NAME',  'Name is too Short.');             // Error for name too short 
define ('TL_NAME',  'Name is too Long.');              // Error for name too long

define ('MIA_ADDR', 'An Email Address is Required.');  // Error for missing email address
define ('MIN_ADDR', 8);                                // Min. length for email address
define ('MAX_ADDR', 50);                               // Max. length for email address
define ('TS_ADDR',  'Email Address is too Short.');    // Error for email too short 
define ('TL_ADDR',  'Email Address is too Long.');     // Error for email too long
define ('INV_ADDR', 'We need a valid email address.'); // Error for invalid email address

define ('MIA_MESG', 'A Message is Required.');         // Error message for missing message
define ('MIN_MESG', 20);                               // Min. length for message
define ('MAX_MESG', 7500);                             // Max. length for message
define ('TS_MESG',  'Message is too Short.');          // Error for message too short 
define ('TL_MESG',  'Message is too Long.');           // Error for message too long

からの抜粋process.php:

// Validate each form field
if (empty($name)) {
    $errors['name'] = MIA_NAME; }    // Missing name
elseif (strlen(trim($_POST['name'])) < MIN_NAME ) {
    $errors['name'] = TS_NAME; }     // Name too short
elseif (strlen(trim($_POST['name'])) > MAX_NAME ) {
    $errors['name'] = TL_NAME; }     // Name too long

if (empty($email)) {
    $errors['email'] = MIA_ADDR; }   // Missing email address
elseif (strlen(trim($_POST['email'])) < MIN_ADDR ) {
    $errors['email'] = TS_ADDR; }    // Email too short
elseif (strlen(trim($_POST['email'])) > MAX_ADDR ) {
    $errors['email'] = TL_ADDR; }    // Email too long
elseif (!(filter_var($email, FILTER_VALIDATE_EMAIL))) {
    $errors['email'] = INV_ADDR; }   // Invalid email address

if (empty($message)) {
    $errors['message'] = MIA_MESG; } // Missing message
elseif (strlen(trim($_POST['message'])) < MIN_MESG ) {
    $errors['message'] = TS_MESG; }  // Message too short
elseif (strlen(trim($_POST['message'])) > MAX_MESG ) {
    $errors['message'] = TL_MESG; }  // Message too long
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