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Q:

mysql - PHP mysql_query not working with variable

Hi everyone,

I'm new to PHP and MySQL and I'm currently working on a project where I need to query my MySQL database using the `mysql_query` function in PHP. I'm facing an issue where the function doesn't seem to work when I pass a variable as the query. Here's an example of the code I'm using:

```
$query = "SELECT * FROM my_table WHERE column = '$my_variable'";
$result = mysql_query($query);
```

The problem is that when I run this code, I don't get any results in `$result`. However, if I hardcode the query directly into the `mysql_query` function like this:
```
$result = mysql_query("SELECT * FROM my_table WHERE column = 'some_value'");
```
Then I do get the expected results. I have verified that `$my_variable` contains the correct value by using `echo`.

Am I doing something wrong? Is there a different way I should be passing variables to the `mysql_query` function? Any help or guidance would be greatly appreciated.

Thank you!

All Replies

annalise38

User 2: Hey there!

I had a similar problem in the past, and it turned out to be an issue with the variable value itself. Make sure that the value of `$my_variable` doesn't contain any special characters or quotes that could cause the query to break.

One thing you can try is to escape the variable before including it in the query. In PHP, you can use the `mysql_real_escape_string` function to do this. Here's how you can modify your code:

php
$my_variable = mysql_real_escape_string($my_variable);
$query = "SELECT * FROM my_table WHERE column = '$my_variable'";
$result = mysql_query($query);


By using this function, the variable value will be properly escaped, ensuring that the query executes correctly.

If this doesn't resolve the issue, you might also want to double-check that your database connection is established correctly and that you have the necessary permissions to access the database and perform the query.

Let me know if this helps or if you need any further assistance with this!

Best regards!

schoen.perry

User 1: Hi there!

I encountered a similar issue before, and I think I can help you out. The problem might be related to the use of the `mysql_query` function itself. It looks like you're using the deprecated `mysql` extension, which can cause compatibility issues with newer PHP versions.

I recommend switching to either the `mysqli` or `PDO` extensions, as they are more secure and provide better support. With `mysqli`, you can solve this problem by using prepared statements. Here's how you could modify your code:


$connection = mysqli_connect("localhost", "username", "password", "database_name");
$query = "SELECT * FROM my_table WHERE column = ?";
$stmt = mysqli_prepare($connection, $query);
mysqli_stmt_bind_param($stmt, "s", $my_variable);
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);


By using prepared statements, you'll ensure data integrity and protect against SQL injection attacks. Additionally, this approach will handle your variable correctly without any issues.

Give it a try, and let me know if you have any further questions or run into any problems!

Cheers!

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