<?php
/**
 *    SimpleXLSX php class v0.7.11
 *    MS Excel 2007 workbooks reader
 *
 * Copyright (c) 2012 - 2018 SimpleXLSX
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   SimpleXLSX
 * @package    SimpleXLSX
 * @copyright  Copyright (c) 2012 - 2018 SimpleXLSX (https://github.com/shuchkin/simplexlsx/)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    0.7.11, 2018-03-21
 */
/** Examples & Changelog
 *
 * Example 1:
 * if ( $xlsx = SimpleXLSX::parse('book.xlsx') ) {
 *   print_r( $xlsx->rows() );
 * } else {
 *   echo SimpleXLSX::parse_error();
 * }
 *
 * Example 2: html table
 * if ( $xlsx = SimpleXLSX::parse('book.xlsx') ) {
 *   echo '<table>';
 *   foreach( $xlsx->rows() as $r ) {
 *     echo '<tr><td>'.implode('</td><td>', $r ).'</td></tr>';
 *   }
 *   echo '</table>';
 * } else {
 *   echo SimpleXLSX::parse_error();
 * }
 *
 * Example 3: rowsEx
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * print_r( $xlsx->rowsEx() );
 *
 * Example 4: select worksheet
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * print_r( $xlsx->rows(2) ); // second worksheet
 *
 * Example 5: IDs and worksheet names
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * print_r( $xlsx->sheetNames() ); // array( 1 => 'Sheet 1', 3 => 'Catalog' );
 *
 * Example 6: get sheet name by id
 * $xlsx = SimpleXLSX::parse('book.xlsx');
 * echo 'Sheet Name 2 = '.$xlsx->sheetName(2);
 *
 * Example 7: read data
 * if ( $xslx = SimpleXLSX::parse( file_get_contents('http://www.example.com/example.xlsx'), true) ) {
 *   list($num_cols, $num_rows) = $xlsx->dimension(2);
 *   echo $xlsx->sheetName(2).':'.$num_cols.'x'.$num_rows;
 * } else {
 *   echo SimpleXLSX::parse_error();
 * }
 *
 * Example 8: old style
 * $xlsx = new SimpleXLSX('book.xlsx');
 * if ( $xlsx->success() ) {
 *   print_r( $xlsx->rows() );
 * } else {
 *   echo 'xlsx error: '.$xlsx->error();
 * }
 *
 * v0.7.11 (2018-04-25) rowsEx(), added row index "r" to cell info
 * v0.7.10 (2018-04-21) fixed getCell, returns NULL if not exits
 * v0.7.9 (2018-01-15) fixed sheetNames() (namespaced or not namespaced attr)
 * v0.7.8 (2018-01-15) remove namespace prefixes (hardcoded)
 * v0.7.7 (2017-10-02) XML External Entity (XXE) Prevention (<!ENTITY xxe SYSTEM "file: ///etc/passwd" >]>)
 * v0.7.6 (2017-09-26) if worksheet_id === 0 (default) then detect first sheet (for LibreOffice capabilities)
 * v0.7.5 (2017-09-10) ->getCell() - fixed
 * v0.7.4 (2017-08-22) ::parse_error() - get last error in "static style"
 * v0.7.3 (2017-08-14) ->_parse fixed relations reader, added ->getCell( sheet_id, address, format ) for direct cell reading
 * v0.7.2 (2017-05-13) ::parse( $filename ) helper method
 * v0.7.1 (2017-03-29) License added
 * v0.6.11 (2016-07-27) fixed timestamp()
 * v0.6.10 (2016-06-10) fixed search entries (UPPERCASE)
 * v0.6.9 (2015-04-12) $xlsx->datetime_format to force dates out
 * v0.6.8 (2013-10-13) fixed dimension() where 1 row only, fixed rowsEx() empty cells indexes (Daniel Stastka)
 * v0.6.7 (2013-08-10) fixed unzip (mac), added $debug param to _constructor to display errors
 * v0.6.6 (2013-06-03) +entryExists(),
 * v0.6.5 (2013-03-18) fixed sheetName()
 * v0.6.4 (2013-03-13) rowsEx(), _parse(): fixed date column type & format detection
 * v0.6.3 (2013-03-13) rowsEx(): fixed formulas, added date type 'd', added format 'format'
 * dimension(): fixed empty sheet dimension
 * + sheetNames() - returns array( sheet_id => sheet_name, sheet_id2 => sheet_name2 ...)
 * v0.6.2 (2012-10-04) fixed empty cells, rowsEx() returns type and formulas now
 * v0.6.1 (2012-09-14) removed "raise exception" and fixed _unzip
 * v0.6 (2012-09-13) success(), error(), __constructor( $filename, $is_data = false )
 * v0.5.1 (2012-09-13) sheetName() fixed
 * v0.5 (2012-09-12) sheetName()
 * v0.4 sheets(), sheetsCount(), unixstamp( $excelDateTime )
 * v0.3 - fixed empty cells (Gonzo patch),
 */
class SimpleXLSX {
	// Don't remove this string! Created by Sergey Shuchkin http://www.shuchkin.ru/simplexlsx/ 2010-2016
	const SCHEMA_REL_OFFICEDOCUMENT = 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument';
	const SCHEMA_REL_SHAREDSTRINGS = 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings';
	const SCHEMA_REL_WORKSHEET = 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet';
	const SCHEMA_REL_STYLES = 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles';
	public static $CF = array( // Cell formats
		0  => 'General',
		1  => '0',
		2  => '0.00',
		3  => '#,##0',
		4  => '#,##0.00',
		9  => '0%',
		10 => '0.00%',
		11 => '0.00E+00',
		12 => '# ?/?',
		13 => '# ??/??',
		14 => 'mm-dd-yy',
		15 => 'd-mmm-yy',
		16 => 'd-mmm',
		17 => 'mmm-yy',
		18 => 'h:mm AM/PM',
		19 => 'h:mm:ss AM/PM',
		20 => 'h:mm',
		21 => 'h:mm:ss',
		22 => 'm/d/yy h:mm',
		37 => '#,##0 ;(#,##0)',
		38 => '#,##0 ;[Red](#,##0)',
		39 => '#,##0.00;(#,##0.00)',
		40 => '#,##0.00;[Red](#,##0.00)',
		44 => '_("$"* #,##0.00_);_("$"* \(#,##0.00\);_("$"* "-"??_);_(@_)',
		45 => 'mm:ss',
		46 => '[h]:mm:ss',
		47 => 'mmss.0',
		48 => '##0.0E+0',
		49 => '@',
		27 => '[$-404]e/m/d',
		30 => 'm/d/yy',
		36 => '[$-404]e/m/d',
		50 => '[$-404]e/m/d',
		57 => '[$-404]e/m/d',
		59 => 't0',
		60 => 't0.00',
		61 => 't#,##0',
		62 => 't#,##0.00',
		67 => 't0%',
		68 => 't0.00%',
		69 => 't# ?/?',
		70 => 't# ??/??',
	);
	public $workbook_cell_formats = array();
	public $datetime_format = 'Y-m-d H:i:s';
	/* @var SimpleXMLElement $workbook */
	private $workbook;
	/* @var SimpleXMLElement[] $sheets */
	private $sheets = array();
	// scheme
	private $styles;
	private $hyperlinks;
	/* @var array[] $package */
	private $package;
	private $datasec;
	private $sharedstrings;
	/*
		private $date_formats = array(
			0xe => "d/m/Y",
			0xf => "d-M-Y",
			0x10 => "d-M",
			0x11 => "M-Y",
			0x12 => "h:i a",
			0x13 => "h:i:s a",
			0x14 => "H:i",
			0x15 => "H:i:s",
			0x16 => "d/m/Y H:i",
			0x2d => "i:s",
			0x2e => "H:i:s",
			0x2f => "i:s.S"
		);
		private $number_formats = array(
			0x1 => "%1.0f",     // "0"
			0x2 => "%1.2f",     // "0.00",
			0x3 => "%1.0f",     //"#,##0",
			0x4 => "%1.2f",     //"#,##0.00",
			0x5 => "%1.0f",     //"$#,##0;($#,##0)",
			0x6 => '$%1.0f',    //"$#,##0;($#,##0)",
			0x7 => '$%1.2f',    //"$#,##0.00;($#,##0.00)",
			0x8 => '$%1.2f',    //"$#,##0.00;($#,##0.00)",
			0x9 => '%1.0f%%',   //"0%"
			0xa => '%1.2f%%',   //"0.00%"
			0xb => '%1.2f',     //"0.00E00",
			0x25 => '%1.0f',    //"#,##0;(#,##0)",
			0x26 => '%1.0f',    //"#,##0;(#,##0)",
			0x27 => '%1.2f',    //"#,##0.00;(#,##0.00)",
			0x28 => '%1.2f',    //"#,##0.00;(#,##0.00)",
			0x29 => '%1.0f',    //"#,##0;(#,##0)",
			0x2a => '$%1.0f',   //"$#,##0;($#,##0)",
			0x2b => '%1.2f',    //"#,##0.00;(#,##0.00)",
			0x2c => '$%1.2f',   //"$#,##0.00;($#,##0.00)",
			0x30 => '%1.0f');   //"##0.0E0";
		// }}}
	*/
	private $error = false;
	private $debug;
	public function __construct( $filename, $is_data = false, $debug = false ) {
		$this->debug   = $debug;
		$this->package = array(
			'filename' => '',
			'mtime'    => 0,
			'size'     => 0,
			'comment'  => '',
			'entries'  => array()
		);
		if ( $this->_unzip( $filename, $is_data ) ) {
			$this->_parse();
		}
	}
	private function _unzip( $filename, $is_data = false ) {
		// Clear current file
		$this->datasec = array();
		if ( $is_data ) {
			$this->package['filename'] = 'default.xlsx';
			$this->package['mtime']    = time();
			$this->package['size']     = strlen( $filename );
			$vZ = $filename;
		} else {
			if ( ! is_readable( $filename ) ) {
				$this->error( 'File not found ' . $filename );
				return false;
			}
			// Package information
			$this->package['filename'] = $filename;
			$this->package['mtime']    = filemtime( $filename );
			$this->package['size']     = filesize( $filename );
			// Read file
			$vZ = file_get_contents( $filename );
		}
		// Cut end of central directory
		/*		$aE = explode("\x50\x4b\x05\x06", $vZ);
				if (count($aE) == 1) {
					$this->error('Unknown format');
					return false;
				}
		*/
		if ( ( $pcd = strrpos( $vZ, "\x50\x4b\x05\x06" ) ) === false ) {
			$this->error( 'Unknown archive format' );
			return false;
		}
		$aE = array(
			0 => substr( $vZ, 0, $pcd ),
			1 => substr( $vZ, $pcd + 3 )
		);
		// Normal way
		$aP                       = unpack( 'x16/v1CL', $aE[1] );
		$this->package['comment'] = substr( $aE[1], 18, $aP['CL'] );
		// Translates end of line from other operating systems
		$this->package['comment'] = strtr( $this->package['comment'], array( "\r\n" => "\n", "\r" => "\n" ) );
		// Cut the entries from the central directory
		$aE = explode( "\x50\x4b\x01\x02", $vZ );
		// Explode to each part
		$aE = explode( "\x50\x4b\x03\x04", $aE[0] );
		// Shift out spanning signature or empty entry
		array_shift( $aE );
		// Loop through the entries
		foreach ( $aE as $vZ ) {
			$aI       = array();
			$aI['E']  = 0;
			$aI['EM'] = '';
			// Retrieving local file header information
//			$aP = unpack('v1VN/v1GPF/v1CM/v1FT/v1FD/V1CRC/V1CS/V1UCS/v1FNL', $vZ);
			$aP = unpack( 'v1VN/v1GPF/v1CM/v1FT/v1FD/V1CRC/V1CS/V1UCS/v1FNL/v1EFL', $vZ );
			// Check if data is encrypted
//			$bE = ($aP['GPF'] && 0x0001) ? TRUE : FALSE;
			$bE = false;
			$nF = $aP['FNL'];
			$mF = $aP['EFL'];
			// Special case : value block after the compressed data
			if ( $aP['GPF'] & 0x0008 ) {
				$aP1 = unpack( 'V1CRC/V1CS/V1UCS', substr( $vZ, - 12 ) );
				$aP['CRC'] = $aP1['CRC'];
				$aP['CS']  = $aP1['CS'];
				$aP['UCS'] = $aP1['UCS'];
				// 2013-08-10
				$vZ = substr( $vZ, 0, - 12 );
				if ( substr( $vZ, - 4 ) === "\x50\x4b\x07\x08" ) {
					$vZ = substr( $vZ, 0, - 4 );
				}
			}
			// Getting stored filename
			$aI['N'] = substr( $vZ, 26, $nF );
			if ( substr( $aI['N'], - 1 ) === '/' ) {
				// is a directory entry - will be skipped
				continue;
			}
			// Truncate full filename in path and filename
			$aI['P'] = dirname( $aI['N'] );
			$aI['P'] = $aI['P'] === '.' ? '' : $aI['P'];
			$aI['N'] = basename( $aI['N'] );
			$vZ = substr( $vZ, 26 + $nF + $mF );
			if ( strlen( $vZ ) !== (int) $aP['CS'] ) { // check only if availabled
				$aI['E']  = 1;
				$aI['EM'] = 'Compressed size is not equal with the value in header information.';
			} else {
				if ( $bE ) {
					$aI['E']  = 5;
					$aI['EM'] = 'File is encrypted, which is not supported from this class.';
				} else {
					switch ( $aP['CM'] ) {
						case 0: // Stored
							// Here is nothing to do, the file ist flat.
							break;
						case 8: // Deflated
							$vZ = gzinflate( $vZ );
							break;
						case 12: // BZIP2
							if ( extension_loaded( 'bz2' ) ) {
								$vZ = bzdecompress( $vZ );
							} else {
								$aI['E']  = 7;
								$aI['EM'] = 'PHP BZIP2 extension not available.';
							}
							break;
						default:
							$aI['E']  = 6;
							$aI['EM'] = "De-/Compression method {$aP['CM']} is not supported.";
					}
					if ( ! $aI['E'] ) {
						if ( $vZ === false ) {
							$aI['E']  = 2;
							$aI['EM'] = 'Decompression of data failed.';
						} else {
							if ( strlen( $vZ ) !== (int) $aP['UCS'] ) {
								$aI['E']  = 3;
								$aI['EM'] = 'Uncompressed size is not equal with the value in header information.';
							} else {
								if ( crc32( $vZ ) !== $aP['CRC'] ) {
									$aI['E']  = 4;
									$aI['EM'] = 'CRC32 checksum is not equal with the value in header information.';
								}
							}
						}
					}
				}
			}
			$aI['D'] = $vZ;
			// DOS to UNIX timestamp
			$aI['T'] = mktime( ( $aP['FT'] & 0xf800 ) >> 11,
				( $aP['FT'] & 0x07e0 ) >> 5,
				( $aP['FT'] & 0x001f ) << 1,
				( $aP['FD'] & 0x01e0 ) >> 5,
				$aP['FD'] & 0x001f,
				( ( $aP['FD'] & 0xfe00 ) >> 9 ) + 1980 );
			//$this->Entries[] = &new SimpleUnzipEntry($aI);
			$this->package['entries'][] = array(
				'data'      => $aI['D'],
				'error'     => $aI['E'],
				'error_msg' => $aI['EM'],
				'name'      => $aI['N'],
				'path'      => $aI['P'],
				'time'      => $aI['T']
			);
		} // end for each entries
		return true;
	}
	// sheets numeration: 1,2,3....
	public function error( $set = false ) {
		if ( $set ) {
			$this->error = $set;
			if ( $this->debug ) {
				trigger_error( __CLASS__ . ': ' . $set, E_USER_WARNING );
			}
		}
		return $this->error;
	}
	private function _parse() {
		// Document data holders
		$this->sharedstrings = array();
		$this->sheets        = array();
//		$this->styles = array();
		// Read relations and search for officeDocument
		if ( $relations = $this->getEntryXML( '_rels/.rels' ) ) {
			foreach ( $relations->Relationship as $rel ) {
				$rel_type = trim( (string) $rel['Type'] );
				$rel_target = trim( (string) $rel['Target'] );
				if ( $rel_type === self::SCHEMA_REL_OFFICEDOCUMENT ) {
					// Found office document! Read workbook & relations...
					// Workbook
					if ( $this->workbook = $this->getEntryXML( $rel_target ) ) {
						if ( $workbookRelations = $this->getEntryXML( dirname( $rel_target ) . '/_rels/workbook.xml.rels' ) ) {
							// Loop relations for workbook and extract sheets...
							foreach ( $workbookRelations->Relationship as $workbookRelation ) {
								$wrel_type = trim( (string) $workbookRelation['Type'] );
								$wrel_path = dirname( trim( (string) $rel['Target'] ) ) . '/' . trim( (string) $workbookRelation['Target'] );
								if ( ! $this->entryExists( $wrel_path ) ) {
									continue;
								}
								if ( $wrel_type === self::SCHEMA_REL_WORKSHEET ) { // Sheets
									if ( $sheet = $this->getEntryXML( $wrel_path ) ) {
										$this->sheets[ str_replace( 'rId', '', (string) $workbookRelation['Id'] ) ] = $sheet;
									}
								} else if ( $wrel_type === self::SCHEMA_REL_SHAREDSTRINGS ) {
									if ( $sharedStrings = $this->getEntryXML( $wrel_path ) ) {
										foreach ( $sharedStrings->si as $val ) {
											if ( isset( $val->t ) ) {
												$this->sharedstrings[] = (string) $val->t;
											} elseif ( isset( $val->r ) ) {
												$this->sharedstrings[] = $this->_parseRichText( $val );
											}
										}
									}
								} else if ( $wrel_type === self::SCHEMA_REL_STYLES ) {
									$this->styles = $this->getEntryXML( $wrel_path );
									$nf = array();
									if ( $this->styles->numFmts->numFmt !== null ) {
										foreach ( $this->styles->numFmts->numFmt as $v ) {
											$nf[ (int) $v['numFmtId'] ] = (string) $v['formatCode'];
										}
									}
									if ( $this->styles->cellXfs->xf !== null ) {
										foreach ( $this->styles->cellXfs->xf as $v ) {
											$v           = (array) $v->attributes();
											$v['format'] = '';
											if ( isset( $v['@attributes']['numFmtId'] ) ) {
												$v = $v['@attributes'];
												$fid = (int) $v['numFmtId'];
												if ( isset( self::$CF[ $fid ] ) ) {
													$v['format'] = self::$CF[ $fid ];
												} else if ( isset( $nf[ $fid ] ) ) {
													$v['format'] = $nf[ $fid ];
												}
											}
											$this->workbook_cell_formats[] = $v;
										}
									}
								}
							}
							break;
						}
					}
				}
			}
		}
		if ( count( $this->sheets ) ) {
			// Sort sheets
			ksort( $this->sheets );
			return true;
		}
		return false;
	}
	/*
	 * @param string $name Filename in archive
	 * @return SimpleXMLElement|bool
	*/
	public function getEntryXML( $name ) {
		if ( $entry_xml = $this->getEntryData( $name ) ) {
			// dirty remove namespace prefixes
			$entry_xml = preg_replace('/xmlns[^=]*="[^"]*"/i','', $entry_xml ); // remove namespaces
			$entry_xml = preg_replace('/[a-zA-Z0-9]+:([a-zA-Z0-9]+="[^"]+")/','$1$2', $entry_xml ); // remove namespaced attrs
			$entry_xml = preg_replace('/<[a-zA-Z0-9]+:([^>]+)>/', '<$1>', $entry_xml); // fix namespaced openned tags
			$entry_xml = preg_replace('/<\/[a-zA-Z0-9]+:([^>]+)>/', '</$1>', $entry_xml); // fix namespaced closed tags
//			echo '<pre>'.$name."\r\n".htmlspecialchars( $entry_xml ).'</pre>'.
			// XML External Entity (XXE) Prevention
			$_old = libxml_disable_entity_loader(true);
			$entry_xmlobj = simplexml_load_string( $entry_xml );
//			echo '<pre>'.print_r( $entry_xmlobj, true).'</pre>';
			libxml_disable_entity_loader($_old);
			if ( $entry_xmlobj ) {
				return $entry_xmlobj;
			}
			$e = libxml_get_last_error();
			$this->error( 'XML-entry ' . $name.' parser error '.$e->message.' line '.$e->line );
		} else {
			$this->error( 'XML-entry not found: ' . $name );
		}
		return false;
	}
	public function getEntryData( $name ) {
		$dir  = strtoupper( dirname( $name ) );
		$name = strtoupper( basename( $name ) );
		foreach ( $this->package['entries'] as $entry ) {
			if ( strtoupper( $entry['path'] ) === $dir && strtoupper( $entry['name'] ) === $name ) {
				return $entry['data'];
			}
		}
		$this->error( 'Entry not found: '.$name );
		return false;
	}
	public function entryExists( $name ) { // 0.6.6
		$dir  = strtoupper( dirname( $name ) );
		$name = strtoupper( basename( $name ) );
		foreach ( $this->package['entries'] as $entry ) {
			if ( strtoupper( $entry['path'] ) === $dir && strtoupper( $entry['name'] ) === $name ) {
				return true;
			}
		}
		return false;
	}
	private function _parseRichText( $is = null ) {
		$value = array();
		if ( isset( $is->t ) ) {
			$value[] = (string) $is->t;
		} else {
			foreach ( $is->r as $run ) {
				$value[] = (string) $run->t;
			}
		}
		return implode( ' ', $value );
	}
	public static function parse( $filename, $is_data = false, $debug = false ) {
		$xlsx = new self( $filename, $is_data, $debug );
		if ( $xlsx->success() ) {
			return $xlsx;
		}
		self::parse_error( $xlsx->error() );
		return false;
	}
	public static function parse_error( $set = false ) {
		static $error = false;
		return ($set) ? $error = $set : $error;
	}
	public function success() {
		return ! $this->error;
	}
	public function rows( $worksheet_id = 0 ) {
		if ( ( $ws = $this->worksheet( $worksheet_id ) ) === false ) {
			return false;
		}
		$rows = array();
		$curR = 0;
		list( $cols, ) = $this->dimension( $worksheet_id );
		/* @var SimpleXMLElement $ws */
		foreach ( $ws->sheetData->row as $row ) {
			$rows[ $curR ] = array();
			foreach ( $row->c as $c ) {
				list( $curC, ) = $this->_columnIndex( (string) $c['r'] );
				$rows[ $curR ][ $curC ] = $this->value( $c );
			}
			for ( $i = 0; $i < $cols; $i ++ ) {
				if ( ! isset( $rows[ $curR ][ $i ] ) ) {
					$rows[ $curR ][ $i ] = '';
				}
			}
			ksort( $rows[ $curR ] );
			$curR ++;
		}
		return $rows;
	}
	public function worksheet( $worksheet_id = 0 ) {
		if ( $worksheet_id === 0 ) {
			reset( $this->sheets );
			$worksheet_id = key( $this->sheets );
		}
		if ( isset( $this->sheets[ $worksheet_id ] ) ) {
			$ws = $this->sheets[ $worksheet_id ];
			if ( isset( $ws->hyperlinks ) ) {
				$this->hyperlinks = array();
				foreach ( $ws->hyperlinks->hyperlink as $hyperlink ) {
					$this->hyperlinks[ (string) $hyperlink['ref'] ] = (string) $hyperlink['display'];
				}
			}
			return $ws;
		}
		$this->error( 'Worksheet ' . $worksheet_id . ' not found.' );
		return false;
	}
	// don't trust ->dimension(), so xlsx generators very lazy and don't public a dimension attribute
	public function dimension( $worksheet_id = 0 ) {
		if ( ( $ws = $this->worksheet( $worksheet_id ) ) === false ) {
			return false;
		}
		/* @var SimpleXMLElement $ws */
		$ref = (string) $ws->dimension['ref'];
		if ( strpos( $ref, ':' ) !== false ) {
			$d = explode( ':', $ref );
			$index = $this->_columnIndex( $d[1] );
			return array( $index[0] + 1, $index[1] + 1 );
		}
		if ( $ref !== '' ) { // 0.6.8
			$index = $this->_columnIndex( $ref );
			return array( $index[0] + 1, $index[1] + 1 );
		}
		return array( 0, 0 );
	}
	private function _columnIndex( $cell = 'A1' ) {
		if ( preg_match( '/([A-Z]+)(\d+)/', $cell, $m ) ) {
			list( ,$col, $row ) = $m;
			$colLen = strlen( $col );
			$index  = 0;
			for ( $i = $colLen - 1; $i >= 0; $i -- ) {
				/** @noinspection PowerOperatorCanBeUsedInspection */
				$index += ( ord( $col[$i] ) - 64 ) * pow( 26, $colLen - $i - 1 );
			}
			return array( $index - 1, $row - 1 );
		}
		$this->error( 'Invalid cell index ' . $cell );
		return false;
	}
	public function value( $cell, $format = null ) {
		// Determine data type
		$dataType = (string) $cell['t'];
		if ( $format === null ) {
			$s = (int) $cell['s'];
			if ( $s > 0 && isset( $this->workbook_cell_formats[ $s ] ) ) {
				$format = $this->workbook_cell_formats[ $s ]['format'];
			}
		}
		if ( strpos( $format, 'm' ) !== false ) {
			$dataType = 'd';
		}
		$value = '';
		switch ( $dataType ) {
			case 's':
				// Value is a shared string
				if ( (string) $cell->v !== '' ) {
					$value = $this->sharedstrings[ (int) $cell->v ];
				}
				break;
			case 'b':
				// Value is boolean
				$value = (string) $cell->v;
				if ( $value === '0' ) {
					$value = false;
				} else if ( $value === '1' ) {
					$value = true;
				} else {
					$value = (bool) $cell->v;
				}
				break;
			case 'inlineStr':
				// Value is rich text inline
				$value = $this->_parseRichText( $cell->is );
				break;
			case 'e':
				// Value is an error message
				if ( (string) $cell->v !== '' ) {
					$value = (string) $cell->v;
				}
				break;
			case 'd':
				// Value is a date
				$value = $this->datetime_format ? gmdate( $this->datetime_format, $this->unixstamp( (float) $cell->v ) ) : (float) $cell->v;
				break;
			default:
				// Value is a string
				$value = (string) $cell->v;
				// Check for numeric values
				if ( is_numeric( $value ) && $dataType !== 's' ) {
					if ( $value == (int) $value ) {
						$value = (int) $value;
					} elseif ( $value == (float) $value ) {
						$value = (float) $value;
					}
				}
		}
		return $value;
	}
	public function unixstamp( $excelDateTime ) {
		$d = floor( $excelDateTime ); // seconds since 1900
		$t = $excelDateTime - $d;
		/** @noinspection SummerTimeUnsafeTimeManipulationInspection */
		return ( abs( $d ) > 0 ) ? ( $d - 25569 ) * 86400 + round( $t * 86400 ) : round( $t * 86400 );
//		return floor( ($d > 0) ? ( $d - 25568 ) * 86400 + $t * 86400 : $t * 86400 ); // Yuri Nunes
	}
	public function rowsEx( $worksheet_id = 0 ) {
		if ( ( $ws = $this->worksheet( $worksheet_id ) ) === false ) {
			return false;
		}
		$rows = array();
		$curR = 0;
		list( $cols, ) = $this->dimension( $worksheet_id );
		/* @var SimpleXMLElement $ws */
		foreach ( $ws->sheetData->row as $row ) {
			$r_idx = (int) $row['r'];
			foreach ( $row->c as $c ) {
				$r = (string) $c['r'];
				$t = (string) $c['t'];
				$s = (int) $c['s'];
				list( $curC, ) = $this->_columnIndex( $r );
				if ( $s > 0 && isset( $this->workbook_cell_formats[ $s ] ) ) {
					$format = $this->workbook_cell_formats[ $s ]['format'];
					if ( strpos( $format, 'm' ) !== false ) {
						$t = 'd';
					}
				} else {
					$format = '';
				}
				$rows[ $curR ][ $curC ] = array(
					'type'   => $t,
					'name'   => $c['r'],
					'value'  => $this->value( $c, $format ),
					'href'   => $this->href( $c ),
					'f'      => (string) $c->f,
					'format' => $format,
					'r' => $r_idx
				);
			}
			for ( $i = 0; $i < $cols; $i ++ ) {
				if ( ! isset( $rows[ $curR ][ $i ] ) ) {
					// 0.6.8
					for ( $c = '', $j = $i; $j >= 0; $j = (int) ( $j / 26 ) - 1 ) {
						$c = chr( $j % 26 + 65 ) . $c;
					}
					$rows[ $curR ][ $i ] = array(
						'type'   => '',
//						'name' => chr($i + 65).($curR+1),
						'name'   => $c . ( $curR + 1 ),
						'value'  => '',
						'href'   => '',
						'f'      => '',
						'format' => '',
						'r' => $r_idx
					);
				}
			}
			ksort( $rows[ $curR ] );
			$curR ++;
		}
		return $rows;
	}
	/** Example: xlsx->getCell(2,'B87', 0);
	 *    Get cell B87 from 2nd worksheet, formatted by General (see $CF for all formats).
	 *    It's useful when we need to get a cell that has the wrong format,
	 *    Or just for direct cell reading. (thx EGO7000)
	 *
	 * @param int $worksheet_id
	 * @param string|array $cell A1 or [0,0]
	 * @param null|int $format
	 *
	 * @return mixed
	 */
	public function getCell( $worksheet_id = 0, $cell = 'A1', $format = null ) {
		if (($ws = $this->worksheet( $worksheet_id)) === false) { return false; }
		list( $curC, $curR ) = is_array( $cell ) ? $cell : $this->_columnIndex( (string) $cell );
		if (isset($ws->sheetData->row[$curR], $ws->sheetData->row[$curR]->c[$curC])) {
			$c = $ws->sheetData->row[ $curR ]->c[ $curC ];
			return $this->value( $c, $format );
		}
		return null;
	}
	public function href( $cell ) {
		return isset( $this->hyperlinks[ (string) $cell['r'] ] ) ? $this->hyperlinks[ (string) $cell['r'] ] : '';
	}
	public function sheets() {
		return $this->sheets;
	}
	public function sheetsCount() {
		return count( $this->sheets );
	}
	public function sheetName( $worksheet_id ) {
		if ( ! isset( $this->workbook->sheets->sheet ) ) {
			return false;
		}
		foreach ( $this->workbook->sheets->sheet as $s ) {
			/* @var SimpleXMLElement $s */
			if ( (int) $s->attributes()->sheetId === (int) $worksheet_id ) {
				return (string) $s->attributes()->name;
			}
		}
		return false;
	}
	public function sheetNames() {
		$result = array();
		foreach ( $this->workbook->sheets->sheet as $s ) {
			/* @var SimpleXMLElement $s */
			/** @noinspection AmbiguousMethodsCallsInArrayMappingInspection */
			$result[ (int) $s->attributes()->sheetId ] = (string) $s->attributes()->name;
		}
		return $result;
	}
	// thx Gonzo
	public function getStyles() {
		return $this->styles;
	}
	public function getPackage() {
		return $this->package;
	}
}