What is the significance of using fetch vs. fetchAll when retrieving data from a database in PHP?

When retrieving data from a database in PHP, using fetch() retrieves one row at a time, while fetchAll() retrieves all rows at once. If you are expecting multiple rows of data, it is more efficient to use fetchAll() as it reduces the number of database calls needed. However, if you only need to process one row at a time, fetch() may be more suitable. 

// Using fetchAll() to retrieve all rows at once
$stmt = $pdo->query("SELECT * FROM table");
$rows = $stmt->fetchAll();

foreach ($rows as $row) {
    // Process each row
}

Keywords

fetch fetchAll database PHP data retrieval

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