How to seperate character from string in php

 <?php

// Sample data

$carNumbers = array('123', '123', '345', '345', '567');

// Initialize serial number

$serialNumber = 1;

// Initialize previous car number

$prevCarNumber = null;

// Output the table

echo "<table border='1'>

        <tr>

            <th>Sr.No</th>

            <th>Car No</th>

            <th>Allocation From Date</th>

            <th>Allocation to Date</th>

        </tr>";

// Loop through car numbers

foreach ($carNumbers as $carNumber) {

    // If the car number is different from the previous one, increment serial number

    if ($carNumber !== $prevCarNumber) {

        $prevCarNumber = $carNumber;

        echo "<tr><td>$serialNumber</td><td>$carNumber</td><td>01-04-2024 15:00</td><td>12-04-2024 15:00</td></tr>";

        $serialNumber++;

    } else {

        // If the car number is the same as the previous one, output a blank space for serial number

        echo "<tr><td></td><td>$carNumber</td><td>01-04-2024 15:00</td><td>12-04-2024 15:00</td></tr>";

    }

}

echo "</table>";

?>