PHP method to determine whether it is a palindrome string

This article mainly introduces the method of PHP to determine whether a string is a palindrome string. The example analyzes the techniques of PHP operating strings to determine palindrome. It has certain reference value. Friends who need it can refer to it

The example in this article describes how PHP determines whether a string is a palindrome string. The specific implementation method is as follows:

<?php
 function ishuiwen($str){
  $len=strlen($str);
  $l=1;
  $k=intval($len/2)+1;
   for($j=0;$j<$k;$j++){
    if (substr($str,$j,1)!=substr($str,$len-$j-1,1))
     {
  $l=0;
  break;
   }
 }
 if ($l==1)
 {
 return 1;
 }
 else
 {
 return -1;
  }
 }
 $str=12321;
 echo ishuiwen($str);
?>

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