What best practices should be followed when updating and deleting database entries based on specific conditions in PHP?

When updating or deleting database entries based on specific conditions in PHP, it is important to use prepared statements to prevent SQL injection attacks. Additionally, it is recommended to check for the existence of the entry before performing any updates or deletions to avoid errors. Finally, always remember to sanitize user input to ensure data integrity. 

// Check if entry exists before updating or deleting
$stmt = $pdo->prepare("SELECT * FROM table_name WHERE condition = :condition");
$stmt->bindParam(':condition', $condition);
$stmt->execute();

if($stmt->rowCount() > 0) {
    // Update entry
    $updateStmt = $pdo->prepare("UPDATE table_name SET column_name = :new_value WHERE condition = :condition");
    $updateStmt->bindParam(':new_value', $new_value);
    $updateStmt->bindParam(':condition', $condition);
    $updateStmt->execute();

    // Delete entry
    $deleteStmt = $pdo->prepare("DELETE FROM table_name WHERE condition = :condition");
    $deleteStmt->bindParam(':condition', $condition);
    $deleteStmt->execute();
} else {
    echo "Entry does not exist.";
}

Keywords

SQL injection PDO prepared statements DELETE query UPDATE query

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