if ( $xlsx = SimpleXLSX::parse('book.xlsx') ) {
    print_r( $xlsx->rows() );
} else {
    echo SimpleXLSX::parseError();
}

Array
(
    [0] => Array
        (
            [0] => ISBN
            [1] => title
            [2] => author
            [3] => publisher
            [4] => ctry
        )

    [1] => Array
        (
            [0] => 618260307
            [1] => The Hobbit
            [2] => J. R. R. Tolkien
            [3] => Houghton Mifflin
            [4] => USA
        )

)

// SimpleXLSX::parse( $filename, $is_data = false, $debug = false ): SimpleXLSX (or false)
// SimpleXLSX::parseFile( $filename, $debug = false ): SimpleXLSX (or false)
// SimpleXLSX::parseData( $data, $debug = false ): SimpleXLSX (or false)

$ composer require shuchkin/simplexlsx

if ( $xlsx = SimpleXLSX::parse('book.xlsx') ) {
    echo '<table border="1" cellpadding="3" style="border-collapse: collapse">';
    foreach( $xlsx->rows() as $r ) {
        echo '<tr><td>'.implode('</td><td>', $r ).'</td></tr>';
    }
    echo '</table>';
    // or $xlsx->toHTML();  
} else {
    echo SimpleXLSX::parseError();
}

echo '<pre>';
if ( $xlsx = SimpleXLSX::parse( 'xlsx/books.xlsx' ) ) {
    foreach ( $xlsx->rows() as $r => $row ) {
        foreach ( $row as $c => $cell ) {
            echo ($c > 0) ? ', ' : '';
            echo ( $r === 0 ) ? '<b>'.$cell.'</b>' : $cell;
        }
        echo '<br/>';
    }
} else {
    echo SimpleXLSX::parseError();
}
echo '</pre>';

if ( $xlsx = SimpleXLSX::parse( 'xlsx/books.xlsx' ) ) {
    print_r( $xlsx->sheetNames() );
}
// Sheet numeration started 0

Array
(
    [0] => Sheet1
    [1] => Sheet2
    [2] => Sheet3
)

print_r( SimpleXLSX::parse('book.xlsx')->rowsEx() );

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [type] => s
                    [name] => A1
                    [value] => ISBN
                    [href] => 
                    [f] => 
                    [format] => 
                    [r] => 1
                )

            [1] => Array
                (
                    [type] => 
                    [name] => B1
                    [value] => 2016-04-12 13:41:00
                    [href] => 
                    [f] => 
                    [format] => m/d/yy h:mm
                    [r] => 2
                )

$xlsx = SimpleXLSX::parse('book.xlsx');
print_r( $xlsx->rows(1) ); // Sheet numeration started 0, we select second worksheet

$xlsx = SimpleXLSX::parse('book.xlsx'); 
echo 'Sheet Name 2 = '.$xlsx->sheetName(1);

if ( $xlsx = SimpleXLSX::parse('http://www.example.com/example.xlsx' ) ) {
    $dim = $xlsx->dimension(1); // don't trust dimension extracted from xml
    $num_cols = $dim[0];
    $num_rows = $dim[1];
    echo $xlsx->sheetName(1).':'.$num_cols.'x'.$num_rows;
} else {
    echo SimpleXLSX::parseError();
}

// For instance $data is a data from database or cache    
if ( $xlsx = SimpleXLSX::parseData( $data ) ) {
    print_r( $xlsx->rows() );
} else {
    echo SimpleXLSX::parseError();
}

echo $xlsx->getCell(0, 'B2'); // The Hobbit

// default SimpleXLSX datetime format YYYY-MM-DD HH:MM:SS (MySQL)
echo $xlsx->getCell(0,'C2'); // 2016-04-12 13:41:00

// custom datetime format
$xlsx->setDateTimeFormat('d.m.Y H:i');
echo $xlsx->getCell(0,'C2'); // 12.04.2016 13:41

// unixstamp
$xlsx->setDateTimeFormat('U');
$ts = $xlsx->getCell(0,'C2'); // 1460468460
echo gmdate('Y-m-d', $ts); // 2016-04-12
echo gmdate('H:i:s', $ts); // 13:41:00

// raw excel value
$xlsx->setDateTimeFormat( NULL ); // returns as excel datetime
$xd = $xlsx->getCell(0,'C2'); // 42472.570138889
echo gmdate('m/d/Y', $xlsx->unixstamp( $xd )); // 04/12/2016
echo gmdate('H:i:s', $xlsx->unixstamp( $xd )); // 13:41:00 

if ( $xlsx = SimpleXLSX::parse('books.xlsx')) {
    // Produce array keys from the array values of 1st array element
    $header_values = $rows = [];
    foreach ( $xlsx->rows() as $k => $r ) {
        if ( $k === 0 ) {
            $header_values = $r;
            continue;
        }
        $rows[] = array_combine( $header_values, $r );
    }
    print_r( $rows );
}

Array
(
    [0] => Array
        (
            [ISBN] => 618260307
            [title] => The Hobbit
            [author] => J. R. R. Tolkien
            [publisher] => Houghton Mifflin
            [ctry] => USA
        )
    [1] => Array
        (
            [ISBN] => 908606664
            [title] => Slinky Malinki
            [author] => Lynley Dodd
            [publisher] => Mallinson Rendel
            [ctry] => NZ
        )
)

ini_set('error_reporting', E_ALL );
ini_set('display_errors', 1 );

if ( $xlsx = SimpleXLSX::parseFile('books.xlsx', true ) ) {
    echo $xlsx->toHTML();
} else {
    echo SimpleXLSX::parseError();
}

$xlsx = new SimpleXLSX('books.xlsx'); // try...catch
if ( $xlsx->success() ) {
    print_r( $xlsx->rows() );
} else {
    echo 'xlsx error: '.$xlsx->error();
}