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Spreadsheet reader

This package provides a PHP spreadsheet reader that differs from others in that the main goal for it was efficient data extraction that could handle large (as in really large) files. So far it may not definitely be CPU, time or I/O-efficient, but at least it won't run out of memory (except maybe for XLS files).

So far, XLSX, ODS and text/CSV file parsing should be memory-efficient. XLS file parsing is done with php-excel-reader from http://code.google.com/p/php-excel-reader/ which, sadly, has memory issues with bigger spreadsheets, as it reads the data all at once and keeps it all in memory.

Installation

Requirements:

• PHP 8.0 or newer
• PHP must have Zip file support (see http://php.net/manual/en/zip.installation.php)

For XLSX-file reading

• PHP must have Simple XML & XML read support

Usage:

All data is read from the file sequentially, with each row being returned as a numeric array. This is about the easiest way to read a file:

However, now also multiple sheet reading is supported for file formats where it is possible. (In case of CSV, it is handled as if it only has one sheet.)

You can retrieve information about sheets contained in the file by calling the sheets() method which returns an array with sheet indexes as keys and sheet names as values. Then you can change the sheet that's currently being read by passing that index to the changeSheet($Index) method.

Example:

If a sheet is changed to the same that is currently open, the position in the file still reverts to the beginning, so as to conform to the same behavior as when changed to a different sheet.

Testing

From the command line:

Test coverage

Start the docker contains and enter the container:

Run the tests with coverage generation:

Running Benchmarks

Run Benchmark Tests

To execute the benchmark tests, use the following command:

This command runs the benchmarks with the default configuration and generates a default report.

Run Benchmark Baseline

To establish a baseline for comparison, run the following command:

This command runs the benchmarks and tags the results as the baseline for future comparisons.

Run Benchmark Test Report

To generate an aggregate report comparing the current benchmarks with the baseline, run:

This command provides insights into the performance changes between the baseline and the current state.

Notes about library performance

• CSV and text files are read strictly sequentially so performance should be O(n);
• When, parsing XLS files, all the file content is read into memory so large XLS files can lead to "out of memory" errors;
• XLSX files use so-called "shared strings" internally to optimize for cases where the same string is repeated multiple times. Internally XLSX is an XML text that is parsed sequentially to extract data from it, however, in some cases these shared strings are a problem - sometimes Excel may put all, or nearly all the strings from the spreadsheet in the shared string file (which is a separate XML text), and not necessarily in the same order. The Worst case scenario is when it is in reverse order — for each string we need to parse the shared string XML from the beginning if we want to avoid keeping the data in memory. To that end, the XLSX parser has a cache for shared strings that is used if the total shared string count is not too high. In case you get out of memory errors, you can try adjusting the SHARED_STRING_CACHE_LIMIT constant in KoenVanMeijeren\SpreadsheetReader\SpreadsheetReader_XLSX to a lower one.

TODOs:

• ODS date formats;

Licensing

All the code in this library is licensed under the MIT license as included in the LICENSE file, however, for now the library relies on php-excel-reader library for XLS file parsing, which is licensed under the PHP license.