PHP outputs the palindrome number between two numbers

This article mainly introduces the method of PHP outputting how many palindromes there are between two numbers. It analyzes the concept of palindromes and related judgment skills with examples. Friends in need can refer to this article

The example describes how PHP outputs how many palindromes there are between two numbers. The specific analysis is as follows:

"Palindrome number" is a kind of number. For example: 98789, this number is read as 98789 upright, and it is also 98789 when read backwards. It is the same when read upright and backward, so this number is a palindrome number.

<?php
 for($i=10;$i<100;$i++){
    $len=strlen($i);
    $l=1;
    $k=intval($len)/2+1;
   for($j=0;$j<$k;$j++){
    if (substr($i,$j,1)!=substr($i,$len-$j-1,1))
     $l=0;
     break;
 }
if ($l==1)
echo $i.&#39;<br>&#39;;
}
?>

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