PHPで数値と文字列が回文であるかどうかを確認するにはどうすればよいですか? (コード例)

<?php 
header("content-type:text/html;charset=utf-8");
function Palindrome($number){   
    $temp = $number;   
    $new = 0;   
    while (floor($temp)) {   
        $d = $temp % 10;   
        $new = $new * 10 + $d;   
        $temp = $temp/10;   
    }   
    if ($new == $number){   
        return 1;   
    } 
    else{ 
        return 0; 
    } 
}   
  
$original = 1441;  
if (Palindrome($original)){   
    echo $original."是回文数";   
}  
else {   
echo $original."不是回文数";  
} 
  
?>

<?php 
header("content-type:text/html;charset=utf-8");
function Palindrome($string){   
    if (strrev($string) == $string){   
        return 1;   
    } 
    else{ 
        return 0; 
    } 
}   
  
$original = "hgbgbgh"; 
if (Palindrome($original)){   
    echo $original."是回文字符串";   
}  
else {   
echo $original."不是回文字符串";  
} 
  
?>

<?php 
header("content-type:text/html;charset=utf-8");
function Palindrome($string){
	//结束递归 
    if ((strlen($string) == 1) || (strlen($string) == 0)){ 
        echo "回文字符串"; 
    } 
  
    else{ 
          
        // 第一个字符与最后一个字符比较
        if (substr($string,0,1) == substr($string,(strlen($string) - 1),1)){ 
              
            // 选中的字母将被丢弃并传递给下一个字符串
            return Palindrome(substr($string,1,strlen($string) -2)); 
        } 
        else{  
            echo "不是回文字符串"; } 
    } 
} 
  
$string = "MALAYALAM"; 
Palindrome($string); 
  
?>

回文字符串