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PHP判断一个字符串是否是回文字符串的方法_PHP

WBOY
WBOYOriginal
2016-05-31 11:45:41805browse

本文实例讲述了PHP判断一个字符串是否是回文字符串的方法。分享给大家供大家参考。具体实现方法如下:

<?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);
?>

希望本文所述对大家的php程序设计有所帮助。

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