ajax pagination

<?php
header('content-type:text/html;charset=utf8');
if(isset($_GET['page'])){
	$page=$_GET['page'];
}else{
	$page=1;
}
//Define a function msubstr() for intercepting a string
function msubstr($str,$start,$len){ //$str refers to the string, $start refers to the starting position of the string, and $len refers to the length.
	$tmpstr="";
	$strlen=$start+$len; //Use $strlen to store the total length of the string (from the start of the string to the total length of the string)
	for($i=0;$i<$strlen;$i++){ //Through the for loop statement, read the string in a loop
		if(ord(substr($str,$i,1))>0xa0){ //If the ASCII ordinal value of the first byte in the string is greater than 0xa0, it means Chinese characters
 			$tmpstr.=substr($str,$i,2); //Take out two characters each time and assign them to the variable $tmpstr, which is equal to one Chinese character
 			$i++; //The variable is incremented by 1
	}else{ //If it is not a Chinese character, take out one character each time and assign it to the variable $tmpstr
  		$tmpstr.=substr($str,$i,1);}
	}
		return $tmpstr; //output string
}
?>
<div id="synopsis">
	<table width="100%" border="0" cellspacing="0" cellpadding="0">
	<tr>
        <td height="20"> </td>
    </tr>
    <tr>
       <td>
		<?php
		  if($page){												
			 $counter=file_get_contents("test.txt");				
		     $length=strlen($counter); //Read the super-long text data and realize the paging display of the data in the super-long text
		     $page_count=ceil($length/2048); //Calculate the number of pages, round up to an integer
		     $c=msubstr($counter,0,($page-1)*2048);
		     $c1=msubstr($counter,0,$page*2048);
			 echo substr($c1,strlen($c),strlen($c1)-strlen($c));
		  }?>    
	  </td>
    </tr>
    <tr>
        <td>
        <table>
  			<tr>
			    <td>
			    	<span> 页次：<?php echo $page;?> / <?php echo $page_count;?> 页 </span>
			    </td>
			    <td>
			    	<span> pagination:
             		<?php if($page!=1){  ?>
						<a href="#" onclick='return artpagination("test.php?page=1")'>首页</a> 
						<a href="#" onclick='return artpagination("test.php?&page=<?php echo $page-1;?>")'>上一页</a> 
				 	<?php  }
				  	if($page<$page_count){ ?>
						<a href="#" onclick='return artpagination("test.php?page=<?php echo $page+1;?>")'>下一页</a> 
				        <a href="#" onclick='return artpagination("test.php?page=<?php echo $page_count;?>")'>尾页</a>
					<?php  } ?>
				    </span>
				</td>
  			</tr>
		</table>
		</td>
     </tr>
</table>
</div>
<script>
//Create an asynchronous HTTP request using the XMLHttpRequest object
function artpagination(url){ //Create a custom function to get the passed parameters
  xmlHttp=new XMLHttpRequest();
  xmlHttp.open('get',url,true); //According to the passed parameters, through the get method, execute another file that implements the paging function
  xmlHttp.onreadystatechange = function(){
    if(xmlHttp.readyState == 4 && xmlHttp.status == 200){ //Return the result to the div tag synopsis
      document.getElementById("synopsis").innerHTML = xmlHttp.responseText;
    }
  }
  xmlHttp.send(null);
}
</script>
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