How can queries in a loop impact the performance and efficiency of PHP code?

Queries in a loop can impact the performance and efficiency of PHP code because each query involves a connection to the database, which can be resource-intensive. To solve this issue, it's recommended to minimize the number of queries in a loop by fetching all necessary data in a single query and then processing it in the loop. 

// Example of fetching data with a single query and processing it in a loop
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0) {
    while($row = mysqli_fetch_assoc($result)) {
        // Process each row here
    }
}

Keywords

loop queries performance efficiency PHP code

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