What debugging strategies can be employed to identify and resolve errors in PHP code related to sorting and grouping data?

Issue: When sorting and grouping data in PHP, errors can occur due to incorrect syntax, logic errors, or incorrect data types being used. To identify and resolve these errors, debugging strategies such as using var_dump() or print_r() to check the data being sorted, reviewing the sorting and grouping logic for errors, and ensuring the correct data types are being used can be employed. Code snippet: 

// Example code to sort and group data in PHP
$data = [
    ['name' => 'John', 'age' => 25],
    ['name' => 'Alice', 'age' => 30],
    ['name' => 'Bob', 'age' => 20],
    ['name' => 'Alice', 'age' => 28],
];

// Sorting the data by name
usort($data, function($a, $b) {
    return strcmp($a['name'], $b['name']);
});

// Grouping the data by name
$groupedData = [];
foreach ($data as $item) {
    $name = $item['name'];
    if (!isset($groupedData[$name])) {
        $groupedData[$name] = [];
    }
    $groupedData[$name][] = $item;
}

// Output the sorted and grouped data
print_r($groupedData);

Keywords

PHP debugging sorting grouping data manipulation

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