构建MySQL查询时出错[关闭]

I am getting an error in select query line. Here it is:

Parse error: syntax error, unexpected '' (T_ENCAPSED_AND_WHITESPACE), expecting identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING

And the code:

<?php
    include('dbconnection.php');

    $sql = "select * from 'user' where id ='.$_REQUEST['id'].' "; 
    $result = mysql_query( $sql);

    if(!$result )
    {
         die('Could not enter data: ' . mysql_error());
    }

 $sql="select * from `user` where id ='".$_REQUEST['id']."' "; 

This will solves your problem But look mysqli_query to limit your SQL-injection vulnerability.

Replace query:

$sql="select * from 'user' where id ='.$_REQUEST['id'].' "; 

with:

$sql="select * from `user` where id =".$_REQUEST['id'].""; 

You can try this:

$id  = (int) $_REQUEST['id']; // interger value
$sql = "select * from `user` where id = '$id' ";