PHP judge input string is not a palindrome

Palindrome: Positive sequence and reversed exact same

$string="ABC126321CBA";$stra=Array();$STRB=Array();$res=checkhuiwen ($string); functioncheckhuiwen($string){//input string to convert to array for($i=0;$i
  
   <>
   $string);      $i+ +) { $stra[ $i]= $string[ $i];       
 } //Reverse output array array_reverse$strb=array_reverse ( $stra); //Determine if two arrays are equal, and equal to Palindrome  for
 ( $i= 0; $i
  <> $stra);          
  $i+ +) { if( $stra[ $i]!= $strb[ $i]) { return          
  1;       break;  }} return2;  } if( $res= = 2) { echo"YES";  } Else{ echo"no!"; }
 
  

'). addclass (' pre-numbering '). Hide (); $ (this). addclass (' has-numbering '). Parent (). append ($numbering); for (i = 1; i <= lines; i++) {$numbering. Append ($ ('

'). Text (i)); }; $numbering. FadeIn (1700); }); });

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