In what situations should PHP developers avoid using the * wildcard in SELECT queries when interacting with a MySQL database?

Using the * wildcard in SELECT queries can lead to performance issues and potential security vulnerabilities, as it retrieves all columns from a table regardless of whether they are needed. It is recommended to explicitly specify the columns needed in the SELECT query to improve performance and security. 

// Avoid using the * wildcard in SELECT queries
$query = "SELECT * FROM users";
```

```php
// Instead, specify the columns needed in the SELECT query
$query = "SELECT id, username, email FROM users";

Keywords

PHP MySQL wildcard SELECT queries data security

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