Why Does My MySQL Query Return a Boolean Instead of a Resource for mysql_fetch_array?

Understanding why MySQL query returns a boolean instead of a resource for mysql_fetch_array and how to resolve the issue.
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Why Does My MySQL Query Return a Boolean Instead of a Resource for mysql_fetch_array?

When working with MySQL queries in PHP, encountering a situation where the query returns a boolean instead of a resource for mysql_fetch_array can be puzzling and frustrating. This issue often results in warnings and prevents the proper handling of database results. Understanding why this happens and knowing how to fix it is crucial for smooth database operations.

Understanding the Warning

One common warning you might encounter is:

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This warning indicates that the mysql_fetch_array function was expecting a resource type as its first argument but instead received a boolean value. This typically means that your MySQL query did not execute as expected.

Common Reasons for the Boolean Return

Query Failure: If the query fails to execute, mysql_query will return false. This boolean false is then mistakenly passed to mysql_fetch_array, causing the warning.

Empty Results: A successful query but with no results may also cause issues if not handled properly, although it should usually not return a boolean, but an empty result set instead.

How to Resolve the Issue

To resolve this issue, verify and handle the return values correctly. Here are the steps to follow:

1. Check the Query Execution:
Ensure that your query is executing properly by checking the return value of mysql_query.

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2. Conditional Fetching:
Only call mysql_fetch_array if the query execution is successful and returns a resource.

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3. Error Handling:
Implement robust error handling to catch and diagnose issues more effectively.

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Conclusion

Receiving a boolean instead of a resource for mysql_fetch_array points to an issue with the query execution. By verifying query success and implementing proper error handling, you can effectively resolve these issues and ensure smooth database operations. Always ensure to check the execution of your queries and handle possible errors to maintain a robust and reliable PHP-MySQL application.