Production guide

Common PHP Excel Mistakes

Fix the most common MNB PHPExcel mistakes involving packages, sheet indexes, missing names, nullable selection, arrays, generators, headers, empty rows, and Composer tags.

Updated July 30, 2026

Available sincev2.0.3Last API changev2.0.5Version guide

LevelBeginnerReading time12 minPackagemnb/mnb-phpexcel or an individual format package

ReadSession::sheet()ReadSession::sheetIfExists()ReadSession::toArray()ReadSession::rows()ReadSession::withHeaderRow()

What you will learn

Recognize API misuse before debugging the reader internals.
Use return types and nullable methods correctly.
Distinguish source-row counts from returned business rows.

Package and entry-class mistakes#

Symptom	Cause	Fix
`Class Mnb\PHPExcel\MnbExcel not found`	Only an individual format package is installed.	Use the format class, such as `Xlsx`, or install `mnb/mnb-phpexcel`.
Composer installs old code	The existing tag points to an older commit; updating `main` does not move a published tag.	Publish a new patch tag and run `composer update package/name -W`.

Worksheet selection mistakes#

Incorrect	Why it fails	Correct approach
`->sheet()`	No worksheet argument was supplied.	Omit the call to use the default/active selection, or pass a name/1-based number.
`->sheet(0)`	Worksheet numbers are 1-based.	Use `->sheet(1)` for the first worksheet.
`->sheet("")`	An empty name is not a worksheet.	Use `sheetOrActive($optionalName)` for optional user input.
`->sheet("Sheet1")`	The visible worksheet name is different.	Call `sheetNames()` or use `sheetIfExists()`.
Use result of `sheetIfExists()` directly	The method can return `null`.	Use `?? $workbook->activeSheet()` or handle `null`.

Return-type mistakes#

$data = $sheet->toStructuredSheetArray($options);
$data->isEmpty();

$data = $sheet->toStructuredSheetArray($options);

if ($data['rows'] === []) {
    echo 'No data rows.';
}

$session = $sheet->withHeaderRow(1);

if ($session->isEmpty()) {
    echo 'No data rows.';
}

Header, empty-row, and count mistakes#

Mistake	Correct interpretation
Treating the header as a returned data row	`withHeaderRow(1)` consumes row 1 as keys; business data begins after it.
Expecting `countRows()` to equal the last Excel row number	It counts normalized returned rows after header, filters, ranges, offsets, limits, projections, and skip-empty settings.
Ignoring sparse row gaps	Use structured row counts to separate stored records, explicit empty rows, implicit sparse gaps, and final returned rows.
Calling several terminal methods on a large worksheet	Each terminal method can cause another read pass. Choose the smallest result needed.

Error handling mistake#

$rows = MnbExcel::read($path)
    ->sheet('Missing')
    ->toArray();

use Mnb\PHPExcel\Support\MnbExcelException;

try {
    $rows = MnbExcel::read($path)
        ->sheet('Orders')
        ->toArray();
} catch (MnbExcelException $error) {
    error_log(json_encode($error->toErrorArray(debug: true)));
    echo 'The workbook could not be processed.';
}

PHP will show a vendor stack trace for any uncaught exception. Catch library exceptions at the application boundary and keep debug details in logs.

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