了解$ _REQUEST。为什么这不会获得$ _REQUEST ['submit']？

Question

以下代码能够从数据库中删除行，但无法插入。这是为什么？

<?php 

    mysql_connect("localhost","formuser","password") or die(mysql_error()); 
    mysql_select_db("formpractice") or die(mysql_error()); 


    $name = $_POST['name']; 
    $address = $_POST['address']; 

    // Add into DB Query 
    $insert = "INSERT INTO Users(name, address) VALUES ('$name', '$address')"; 
    $insert_result = mysql_query($insert); 

    // Delete from DB Query 
    $delete = "DELETE FROM Users WHERE name = '$name' OR address = '$address'"; 
    $delete_result = mysql_query($delete); 

    if(isset($_REQUEST['submit'])) { 
     if ($insert_result) { 
      echo "Success"; 
     } else { 
      echo "Failed to submit"; 
     } 
     echo 'Submit Request'; 

    } else if (isset($_REQUEST['delete'])) { 
     if ($delete_result) { 
      echo "Deleted"; 
     } else { 
      echo "Failed to submit"; 
     } 
    } 


?> 

Answer 1

试试这个：

mysql_connect("localhost","formuser","password") or die(mysql_error()); 
mysql_select_db("formpractice") or die(mysql_error()); 

$name = $_POST['name']; 
$address = $_POST['address']; 

if(isset($_REQUEST['submit'])) { 
    // Add into DB Query 
    $insert = "INSERT INTO Users(name, address) VALUES ('$name', '$address')"; 
    $insert_result = mysql_query($insert); 
    if ($insert_result) { 
     echo "Success"; 
    } else { 
     echo "Failed to submit"; 
    } 
    echo 'Submit Request'; 

} else if (isset($_REQUEST['delete'])) { 
    // Delete from DB Query 
    $delete = "DELETE FROM Users WHERE name = '$name' OR address = '$address'"; 
    $delete_result = mysql_query($delete); 
    if ($delete_result) { 
     echo "Deleted"; 
    } else { 
     echo "Failed to submit"; 
    } 
}