How can experienced PHP developers handle complex tasks like evaluating multiple <select multiple> elements with access to multiple MySQL tables effectively?

Experienced PHP developers can handle complex tasks like evaluating multiple <select multiple> elements with access to multiple MySQL tables effectively by using efficient SQL queries to retrieve the necessary data, organizing the retrieved data into arrays or objects for easier manipulation, and implementing logical conditions to process the selected options from the <select> elements. 

// Example PHP code snippet for handling multiple &lt;select multiple&gt; elements with access to multiple MySQL tables

// Retrieve data from MySQL tables
$query1 = &quot;SELECT * FROM table1&quot;;
$result1 = mysqli_query($connection, $query1);
$data1 = mysqli_fetch_all($result1, MYSQLI_ASSOC);

$query2 = &quot;SELECT * FROM table2&quot;;
$result2 = mysqli_query($connection, $query2);
$data2 = mysqli_fetch_all($result2, MYSQLI_ASSOC);

// Process selected options from &lt;select&gt; elements
if(isset($_POST[&#039;select1&#039;])){
    $selectedOptions1 = $_POST[&#039;select1&#039;];
    foreach($selectedOptions1 as $option){
        // Process selected option from select1
    }
}

if(isset($_POST[&#039;select2&#039;])){
    $selectedOptions2 = $_POST[&#039;select2&#039;];
    foreach($selectedOptions2 as $option){
        // Process selected option from select2
    }
}

Keywords

PHP <select multiple> MySQL tables evaluation

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