What potential issues can arise when sorting DB entries by date in PHP?

When sorting DB entries by date in PHP, potential issues can arise if the date format is not consistent across all entries. To solve this, you can use the strtotime function to convert the date strings to Unix timestamps before sorting. 

// Assuming $entries is an array of DB entries with a 'date' field

// Convert date strings to Unix timestamps
foreach ($entries as $key => $entry) {
    $entries[$key]['date_timestamp'] = strtotime($entry['date']);
}

// Sort entries by date
usort($entries, function($a, $b) {
    return $a['date_timestamp'] - $b['date_timestamp'];
});

Keywords

SQL injection date format timezone conversion timestamp sorting algorithm

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