cant add POST content to mysql database - php

Question

<?php
require "config.php";
/*
CREATE TABLE `addnews` (
`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`auther` VARCHAR( 255 ) NOT NULL ,
`title` VARCHAR( 255 ) NOT NULL ,
`content` LONGTEXT NOT NULL
) ENGINE = MYISAM ;
*/
$a = $_POST['author'];
$t = $_POST['title'];
$c = $_POST['content'];
if(isset($_POST["add"]) and $_POST["add"] == "news"){
$insert = mysql_query('INSERT INTO addnews
(author,title,content)
VALUES
("$a","$t","$c")') or die("error");
if (isset($insert )){
echo "<h3>Done</h3>";
}
};
echo "
<form action='".$_SERVER['PHP_SELF']."' method='post'>
Author : <input type='text' name='author' /><br>
Title : <input type='text' name='title' /><br>
Content : <textarea name='content'></textarea>
<input type='submit' value='Add news' />
<input type='hidden' name='add' value='news' />
</form>
";
mysql_close($connectdb);
?>
i am getting error from this statment i think
if(isset($_POST["add"]) and $_POST["add"] == "news"){
$insert = mysql_query('INSERT INTO addnews
(author,title,content)
VALUES
("$a","$t","$c")') or die("error happend while trying to add information to database");
if (isset($insert )){
echo "<h3>Done</h3>";
}
};
output is : error happend while trying to add information to database
and no problem with config.php file (the file that connect to database)
i am using phpmyadmin

Answer 1

strings in sql are surrounded by ' (single quote) , not by " (double quote)
strings in php will act two ways
those in ' (single quote) will write literally as tyou typed them ($a stays $a - not $a value)
those in " (double quote) will interpret values inside - so $a will be substituted with $a's value
when failing DB operation - it is usually useful to see what was wrong - use mysql_error for that

Answer 2

Use && instead of the actual word and:
if(isset($_POST["add"]) && $_POST["add"] == "news"){
$insert = mysql_query("INSERT INTO addnews
(author,title,content)
VALUES
('$a','$t','$c')") or die("error happend while trying to add information to database");
if (isset($insert )){
echo "<h3>Done</h3>";
}
};

Answer 3

Here you go try this one
if(isset($_POST["add"]) and $_POST["add"] == "news"){
$insert = mysql_query('INSERT INTO addnews
(author,title,content)
VALUES
("'. $a .'","'. $t .'","'. $c .'")') or die("error happend while trying to add information to database");
if (isset($insert )){
echo "<h3>Done</h3>";
}
};
used "'. $a .'" instead "$a".

Answer 4

I think the query statement is wrong,
Double quotes inside the single quotes is not valid in php.
So you will change the quotes in query like below code,
$insert = mysql_query("INSERT INTO addnews
(author,title,content)
VALUES
('$a','$t','$c')") or die("error");
try this..:-)

Answer 5

Please do the correction in your code like as follow:
$insert = mysql_query("INSERT INTO addnews
(author,title,content)
VALUES
('$a','$t','$c')") or die(mysql_error($link));//Where $link mysql resource object
You will get the answer why Mysql not inserting your data.