What are some potential performance issues when selecting a large number of entries from a database using PHP?

One potential performance issue when selecting a large number of entries from a database using PHP is the use of inefficient queries that retrieve unnecessary data. To solve this, you can optimize your SQL queries by only selecting the columns you need and adding appropriate indexes to the database tables. 

// Example of selecting specific columns and adding indexes to database table
$query = "SELECT column1, column2 FROM table_name WHERE condition = :condition";
$stmt = $pdo->prepare($query);
$stmt->bindParam(':condition', $condition);
$stmt->execute();
```

Another potential performance issue is not using prepared statements, which can lead to SQL injection attacks and slower query execution. To solve this, always use prepared statements when interacting with the database in PHP.

```php
// Example of using prepared statements to prevent SQL injection
$query = "SELECT * FROM table_name WHERE id = :id";
$stmt = $pdo->prepare($query);
$stmt->bindParam(':id', $id, PDO::PARAM_INT);
$stmt->execute();

Keywords

SQL queries database optimization indexing memory management PHP memory limit

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