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2388 jpm 1
<?php
2
/**
3
 * PHPExcel
4
 *
5
 * Copyright (c) 2006 - 2013 PHPExcel
6
 *
7
 * This library is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * This library is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with this library; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
20
 *
21
 * @category   PHPExcel
22
 * @package    PHPExcel_Shared
23
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
24
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
25
 * @version    ##VERSION##, ##DATE##
26
 */
27
 
28
 
29
/**
30
 * PHPExcel_Shared_String
31
 *
32
 * @category   PHPExcel
33
 * @package    PHPExcel_Shared
34
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
35
 */
36
class PHPExcel_Shared_String
37
{
38
	/**	Constants				*/
39
	/**	Regular Expressions		*/
40
	//	Fraction
41
	const STRING_REGEXP_FRACTION	= '(-?)(\d+)\s+(\d+\/\d+)';
42
 
43
 
44
	/**
45
	 * Control characters array
46
	 *
47
	 * @var string[]
48
	 */
49
	private static $_controlCharacters = array();
50
 
51
	/**
52
	 * SYLK Characters array
53
	 *
54
	 * $var array
55
	 */
56
	private static $_SYLKCharacters = array();
57
 
58
	/**
59
	 * Decimal separator
60
	 *
61
	 * @var string
62
	 */
63
	private static $_decimalSeparator;
64
 
65
	/**
66
	 * Thousands separator
67
	 *
68
	 * @var string
69
	 */
70
	private static $_thousandsSeparator;
71
 
72
	/**
73
	 * Currency code
74
	 *
75
	 * @var string
76
	 */
77
	private static $_currencyCode;
78
 
79
	/**
80
	 * Is mbstring extension avalable?
81
	 *
82
	 * @var boolean
83
	 */
84
	private static $_isMbstringEnabled;
85
 
86
	/**
87
	 * Is iconv extension avalable?
88
	 *
89
	 * @var boolean
90
	 */
91
	private static $_isIconvEnabled;
92
 
93
	/**
94
	 * Build control characters array
95
	 */
96
	private static function _buildControlCharacters() {
97
		for ($i = 0; $i <= 31; ++$i) {
98
			if ($i != 9 && $i != 10 && $i != 13) {
99
				$find = '_x' . sprintf('%04s' , strtoupper(dechex($i))) . '_';
100
				$replace = chr($i);
101
				self::$_controlCharacters[$find] = $replace;
102
			}
103
		}
104
	}
105
 
106
	/**
107
	 * Build SYLK characters array
108
	 */
109
	private static function _buildSYLKCharacters()
110
	{
111
		self::$_SYLKCharacters = array(
112
			"\x1B 0"  => chr(0),
113
			"\x1B 1"  => chr(1),
114
			"\x1B 2"  => chr(2),
115
			"\x1B 3"  => chr(3),
116
			"\x1B 4"  => chr(4),
117
			"\x1B 5"  => chr(5),
118
			"\x1B 6"  => chr(6),
119
			"\x1B 7"  => chr(7),
120
			"\x1B 8"  => chr(8),
121
			"\x1B 9"  => chr(9),
122
			"\x1B :"  => chr(10),
123
			"\x1B ;"  => chr(11),
124
			"\x1B <"  => chr(12),
125
			"\x1B :"  => chr(13),
126
			"\x1B >"  => chr(14),
127
			"\x1B ?"  => chr(15),
128
			"\x1B!0"  => chr(16),
129
			"\x1B!1"  => chr(17),
130
			"\x1B!2"  => chr(18),
131
			"\x1B!3"  => chr(19),
132
			"\x1B!4"  => chr(20),
133
			"\x1B!5"  => chr(21),
134
			"\x1B!6"  => chr(22),
135
			"\x1B!7"  => chr(23),
136
			"\x1B!8"  => chr(24),
137
			"\x1B!9"  => chr(25),
138
			"\x1B!:"  => chr(26),
139
			"\x1B!;"  => chr(27),
140
			"\x1B!<"  => chr(28),
141
			"\x1B!="  => chr(29),
142
			"\x1B!>"  => chr(30),
143
			"\x1B!?"  => chr(31),
144
			"\x1B'?"  => chr(127),
145
			"\x1B(0"  => '€', // 128 in CP1252
146
			"\x1B(2"  => '‚', // 130 in CP1252
147
			"\x1B(3"  => 'ƒ', // 131 in CP1252
148
			"\x1B(4"  => '„', // 132 in CP1252
149
			"\x1B(5"  => '…', // 133 in CP1252
150
			"\x1B(6"  => '†', // 134 in CP1252
151
			"\x1B(7"  => '‡', // 135 in CP1252
152
			"\x1B(8"  => 'ˆ', // 136 in CP1252
153
			"\x1B(9"  => '‰', // 137 in CP1252
154
			"\x1B(:"  => 'Š', // 138 in CP1252
155
			"\x1B(;"  => '‹', // 139 in CP1252
156
			"\x1BNj"  => 'Œ', // 140 in CP1252
157
			"\x1B(>"  => 'Ž', // 142 in CP1252
158
			"\x1B)1"  => '‘', // 145 in CP1252
159
			"\x1B)2"  => '’', // 146 in CP1252
160
			"\x1B)3"  => '“', // 147 in CP1252
161
			"\x1B)4"  => '”', // 148 in CP1252
162
			"\x1B)5"  => '•', // 149 in CP1252
163
			"\x1B)6"  => '–', // 150 in CP1252
164
			"\x1B)7"  => '—', // 151 in CP1252
165
			"\x1B)8"  => '˜', // 152 in CP1252
166
			"\x1B)9"  => '™', // 153 in CP1252
167
			"\x1B):"  => 'š', // 154 in CP1252
168
			"\x1B);"  => '›', // 155 in CP1252
169
			"\x1BNz"  => 'œ', // 156 in CP1252
170
			"\x1B)>"  => 'ž', // 158 in CP1252
171
			"\x1B)?"  => 'Ÿ', // 159 in CP1252
172
			"\x1B*0"  => ' ', // 160 in CP1252
173
			"\x1BN!"  => '¡', // 161 in CP1252
174
			"\x1BN\"" => '¢', // 162 in CP1252
175
			"\x1BN#"  => '£', // 163 in CP1252
176
			"\x1BN("  => '¤', // 164 in CP1252
177
			"\x1BN%"  => '¥', // 165 in CP1252
178
			"\x1B*6"  => '¦', // 166 in CP1252
179
			"\x1BN'"  => '§', // 167 in CP1252
180
			"\x1BNH " => '¨', // 168 in CP1252
181
			"\x1BNS"  => '©', // 169 in CP1252
182
			"\x1BNc"  => 'ª', // 170 in CP1252
183
			"\x1BN+"  => '«', // 171 in CP1252
184
			"\x1B*<"  => '¬', // 172 in CP1252
185
			"\x1B*="  => '­', // 173 in CP1252
186
			"\x1BNR"  => '®', // 174 in CP1252
187
			"\x1B*?"  => '¯', // 175 in CP1252
188
			"\x1BN0"  => '°', // 176 in CP1252
189
			"\x1BN1"  => '±', // 177 in CP1252
190
			"\x1BN2"  => '²', // 178 in CP1252
191
			"\x1BN3"  => '³', // 179 in CP1252
192
			"\x1BNB " => '´', // 180 in CP1252
193
			"\x1BN5"  => 'µ', // 181 in CP1252
194
			"\x1BN6"  => '¶', // 182 in CP1252
195
			"\x1BN7"  => '·', // 183 in CP1252
196
			"\x1B+8"  => '¸', // 184 in CP1252
197
			"\x1BNQ"  => '¹', // 185 in CP1252
198
			"\x1BNk"  => 'º', // 186 in CP1252
199
			"\x1BN;"  => '»', // 187 in CP1252
200
			"\x1BN<"  => '¼', // 188 in CP1252
201
			"\x1BN="  => '½', // 189 in CP1252
202
			"\x1BN>"  => '¾', // 190 in CP1252
203
			"\x1BN?"  => '¿', // 191 in CP1252
204
			"\x1BNAA" => 'À', // 192 in CP1252
205
			"\x1BNBA" => 'Á', // 193 in CP1252
206
			"\x1BNCA" => 'Â', // 194 in CP1252
207
			"\x1BNDA" => 'Ã', // 195 in CP1252
208
			"\x1BNHA" => 'Ä', // 196 in CP1252
209
			"\x1BNJA" => 'Å', // 197 in CP1252
210
			"\x1BNa"  => 'Æ', // 198 in CP1252
211
			"\x1BNKC" => 'Ç', // 199 in CP1252
212
			"\x1BNAE" => 'È', // 200 in CP1252
213
			"\x1BNBE" => 'É', // 201 in CP1252
214
			"\x1BNCE" => 'Ê', // 202 in CP1252
215
			"\x1BNHE" => 'Ë', // 203 in CP1252
216
			"\x1BNAI" => 'Ì', // 204 in CP1252
217
			"\x1BNBI" => 'Í', // 205 in CP1252
218
			"\x1BNCI" => 'Î', // 206 in CP1252
219
			"\x1BNHI" => 'Ï', // 207 in CP1252
220
			"\x1BNb"  => 'Ð', // 208 in CP1252
221
			"\x1BNDN" => 'Ñ', // 209 in CP1252
222
			"\x1BNAO" => 'Ò', // 210 in CP1252
223
			"\x1BNBO" => 'Ó', // 211 in CP1252
224
			"\x1BNCO" => 'Ô', // 212 in CP1252
225
			"\x1BNDO" => 'Õ', // 213 in CP1252
226
			"\x1BNHO" => 'Ö', // 214 in CP1252
227
			"\x1B-7"  => '×', // 215 in CP1252
228
			"\x1BNi"  => 'Ø', // 216 in CP1252
229
			"\x1BNAU" => 'Ù', // 217 in CP1252
230
			"\x1BNBU" => 'Ú', // 218 in CP1252
231
			"\x1BNCU" => 'Û', // 219 in CP1252
232
			"\x1BNHU" => 'Ü', // 220 in CP1252
233
			"\x1B-="  => 'Ý', // 221 in CP1252
234
			"\x1BNl"  => 'Þ', // 222 in CP1252
235
			"\x1BN{"  => 'ß', // 223 in CP1252
236
			"\x1BNAa" => 'à', // 224 in CP1252
237
			"\x1BNBa" => 'á', // 225 in CP1252
238
			"\x1BNCa" => 'â', // 226 in CP1252
239
			"\x1BNDa" => 'ã', // 227 in CP1252
240
			"\x1BNHa" => 'ä', // 228 in CP1252
241
			"\x1BNJa" => 'å', // 229 in CP1252
242
			"\x1BNq"  => 'æ', // 230 in CP1252
243
			"\x1BNKc" => 'ç', // 231 in CP1252
244
			"\x1BNAe" => 'è', // 232 in CP1252
245
			"\x1BNBe" => 'é', // 233 in CP1252
246
			"\x1BNCe" => 'ê', // 234 in CP1252
247
			"\x1BNHe" => 'ë', // 235 in CP1252
248
			"\x1BNAi" => 'ì', // 236 in CP1252
249
			"\x1BNBi" => 'í', // 237 in CP1252
250
			"\x1BNCi" => 'î', // 238 in CP1252
251
			"\x1BNHi" => 'ï', // 239 in CP1252
252
			"\x1BNs"  => 'ð', // 240 in CP1252
253
			"\x1BNDn" => 'ñ', // 241 in CP1252
254
			"\x1BNAo" => 'ò', // 242 in CP1252
255
			"\x1BNBo" => 'ó', // 243 in CP1252
256
			"\x1BNCo" => 'ô', // 244 in CP1252
257
			"\x1BNDo" => 'õ', // 245 in CP1252
258
			"\x1BNHo" => 'ö', // 246 in CP1252
259
			"\x1B/7"  => '÷', // 247 in CP1252
260
			"\x1BNy"  => 'ø', // 248 in CP1252
261
			"\x1BNAu" => 'ù', // 249 in CP1252
262
			"\x1BNBu" => 'ú', // 250 in CP1252
263
			"\x1BNCu" => 'û', // 251 in CP1252
264
			"\x1BNHu" => 'ü', // 252 in CP1252
265
			"\x1B/="  => 'ý', // 253 in CP1252
266
			"\x1BN|"  => 'þ', // 254 in CP1252
267
			"\x1BNHy" => 'ÿ', // 255 in CP1252
268
		);
269
	}
270
 
271
	/**
272
	 * Get whether mbstring extension is available
273
	 *
274
	 * @return boolean
275
	 */
276
	public static function getIsMbstringEnabled()
277
	{
278
		if (isset(self::$_isMbstringEnabled)) {
279
			return self::$_isMbstringEnabled;
280
		}
281
 
282
		self::$_isMbstringEnabled = function_exists('mb_convert_encoding') ?
283
			true : false;
284
 
285
		return self::$_isMbstringEnabled;
286
	}
287
 
288
	/**
289
	 * Get whether iconv extension is available
290
	 *
291
	 * @return boolean
292
	 */
293
	public static function getIsIconvEnabled()
294
	{
295
		if (isset(self::$_isIconvEnabled)) {
296
			return self::$_isIconvEnabled;
297
		}
298
 
299
		// Fail if iconv doesn't exist
300
		if (!function_exists('iconv')) {
301
			self::$_isIconvEnabled = false;
302
			return false;
303
		}
304
 
305
		// Sometimes iconv is not working, and e.g. iconv('UTF-8', 'UTF-16LE', 'x') just returns false,
306
		if (!@iconv('UTF-8', 'UTF-16LE', 'x')) {
307
			self::$_isIconvEnabled = false;
308
			return false;
309
		}
310
 
311
		// Sometimes iconv_substr('A', 0, 1, 'UTF-8') just returns false in PHP 5.2.0
312
		// we cannot use iconv in that case either (http://bugs.php.net/bug.php?id=37773)
313
		if (!@iconv_substr('A', 0, 1, 'UTF-8')) {
314
			self::$_isIconvEnabled = false;
315
			return false;
316
		}
317
 
318
		// CUSTOM: IBM AIX iconv() does not work
319
		if ( defined('PHP_OS') && @stristr(PHP_OS, 'AIX')
320
				&& defined('ICONV_IMPL') && (@strcasecmp(ICONV_IMPL, 'unknown') == 0)
321
				&& defined('ICONV_VERSION') && (@strcasecmp(ICONV_VERSION, 'unknown') == 0) )
322
		{
323
			self::$_isIconvEnabled = false;
324
			return false;
325
		}
326
 
327
		// If we reach here no problems were detected with iconv
328
		self::$_isIconvEnabled = true;
329
		return true;
330
	}
331
 
332
	public static function buildCharacterSets() {
333
		if(empty(self::$_controlCharacters)) {
334
			self::_buildControlCharacters();
335
		}
336
		if(empty(self::$_SYLKCharacters)) {
337
			self::_buildSYLKCharacters();
338
		}
339
	}
340
 
341
	/**
342
	 * Convert from OpenXML escaped control character to PHP control character
343
	 *
344
	 * Excel 2007 team:
345
	 * ----------------
346
	 * That's correct, control characters are stored directly in the shared-strings table.
347
	 * We do encode characters that cannot be represented in XML using the following escape sequence:
348
	 * _xHHHH_ where H represents a hexadecimal character in the character's value...
349
	 * So you could end up with something like _x0008_ in a string (either in a cell value (<v>)
350
	 * element or in the shared string <t> element.
351
	 *
352
	 * @param 	string	$value	Value to unescape
353
	 * @return 	string
354
	 */
355
	public static function ControlCharacterOOXML2PHP($value = '') {
356
		return str_replace( array_keys(self::$_controlCharacters), array_values(self::$_controlCharacters), $value );
357
	}
358
 
359
	/**
360
	 * Convert from PHP control character to OpenXML escaped control character
361
	 *
362
	 * Excel 2007 team:
363
	 * ----------------
364
	 * That's correct, control characters are stored directly in the shared-strings table.
365
	 * We do encode characters that cannot be represented in XML using the following escape sequence:
366
	 * _xHHHH_ where H represents a hexadecimal character in the character's value...
367
	 * So you could end up with something like _x0008_ in a string (either in a cell value (<v>)
368
	 * element or in the shared string <t> element.
369
	 *
370
	 * @param 	string	$value	Value to escape
371
	 * @return 	string
372
	 */
373
	public static function ControlCharacterPHP2OOXML($value = '') {
374
		return str_replace( array_values(self::$_controlCharacters), array_keys(self::$_controlCharacters), $value );
375
	}
376
 
377
	/**
378
	 * Try to sanitize UTF8, stripping invalid byte sequences. Not perfect. Does not surrogate characters.
379
	 *
380
	 * @param string $value
381
	 * @return string
382
	 */
383
	public static function SanitizeUTF8($value)
384
	{
385
		if (self::getIsIconvEnabled()) {
386
			$value = @iconv('UTF-8', 'UTF-8', $value);
387
			return $value;
388
		}
389
 
390
		if (self::getIsMbstringEnabled()) {
391
			$value = mb_convert_encoding($value, 'UTF-8', 'UTF-8');
392
			return $value;
393
		}
394
 
395
		// else, no conversion
396
		return $value;
397
	}
398
 
399
	/**
400
	 * Check if a string contains UTF8 data
401
	 *
402
	 * @param string $value
403
	 * @return boolean
404
	 */
405
	public static function IsUTF8($value = '') {
406
		return utf8_encode(utf8_decode($value)) === $value;
407
	}
408
 
409
	/**
410
	 * Formats a numeric value as a string for output in various output writers forcing
411
	 * point as decimal separator in case locale is other than English.
412
	 *
413
	 * @param mixed $value
414
	 * @return string
415
	 */
416
	public static function FormatNumber($value) {
417
		if (is_float($value)) {
418
			return str_replace(',', '.', $value);
419
		}
420
		return (string) $value;
421
	}
422
 
423
	/**
424
	 * Converts a UTF-8 string into BIFF8 Unicode string data (8-bit string length)
425
	 * Writes the string using uncompressed notation, no rich text, no Asian phonetics
426
	 * If mbstring extension is not available, ASCII is assumed, and compressed notation is used
427
	 * although this will give wrong results for non-ASCII strings
428
	 * see OpenOffice.org's Documentation of the Microsoft Excel File Format, sect. 2.5.3
429
	 *
430
	 * @param string  $value    UTF-8 encoded string
431
	 * @param mixed[] $arrcRuns Details of rich text runs in $value
432
	 * @return string
433
	 */
434
	public static function UTF8toBIFF8UnicodeShort($value, $arrcRuns = array())
435
	{
436
		// character count
437
		$ln = self::CountCharacters($value, 'UTF-8');
438
		// option flags
439
		if(empty($arrcRuns)){
440
			$opt = (self::getIsIconvEnabled() || self::getIsMbstringEnabled()) ?
441
				0x0001 : 0x0000;
442
			$data = pack('CC', $ln, $opt);
443
			// characters
444
			$data .= self::ConvertEncoding($value, 'UTF-16LE', 'UTF-8');
445
		}
446
		else {
447
			$data = pack('vC', $ln, 0x09);
448
			$data .= pack('v', count($arrcRuns));
449
			// characters
450
			$data .= self::ConvertEncoding($value, 'UTF-16LE', 'UTF-8');
451
			foreach ($arrcRuns as $cRun){
452
				$data .= pack('v', $cRun['strlen']);
453
				$data .= pack('v', $cRun['fontidx']);
454
			}
455
		}
456
		return $data;
457
	}
458
 
459
	/**
460
	 * Converts a UTF-8 string into BIFF8 Unicode string data (16-bit string length)
461
	 * Writes the string using uncompressed notation, no rich text, no Asian phonetics
462
	 * If mbstring extension is not available, ASCII is assumed, and compressed notation is used
463
	 * although this will give wrong results for non-ASCII strings
464
	 * see OpenOffice.org's Documentation of the Microsoft Excel File Format, sect. 2.5.3
465
	 *
466
	 * @param string $value UTF-8 encoded string
467
	 * @return string
468
	 */
469
	public static function UTF8toBIFF8UnicodeLong($value)
470
	{
471
		// character count
472
		$ln = self::CountCharacters($value, 'UTF-8');
473
 
474
		// option flags
475
		$opt = (self::getIsIconvEnabled() || self::getIsMbstringEnabled()) ?
476
			0x0001 : 0x0000;
477
 
478
		// characters
479
		$chars = self::ConvertEncoding($value, 'UTF-16LE', 'UTF-8');
480
 
481
		$data = pack('vC', $ln, $opt) . $chars;
482
		return $data;
483
	}
484
 
485
	/**
486
	 * Convert string from one encoding to another. First try mbstring, then iconv, finally strlen
487
	 *
488
	 * @param string $value
489
	 * @param string $to Encoding to convert to, e.g. 'UTF-8'
490
	 * @param string $from Encoding to convert from, e.g. 'UTF-16LE'
491
	 * @return string
492
	 */
493
	public static function ConvertEncoding($value, $to, $from)
494
	{
495
		if (self::getIsIconvEnabled()) {
496
			return iconv($from, $to, $value);
497
		}
498
 
499
		if (self::getIsMbstringEnabled()) {
500
			return mb_convert_encoding($value, $to, $from);
501
		}
502
 
503
		if($from == 'UTF-16LE'){
504
			return self::utf16_decode($value, false);
505
		}else if($from == 'UTF-16BE'){
506
			return self::utf16_decode($value);
507
		}
508
		// else, no conversion
509
		return $value;
510
	}
511
 
512
	/**
513
	 * Decode UTF-16 encoded strings.
514
	 *
515
	 * Can handle both BOM'ed data and un-BOM'ed data.
516
	 * Assumes Big-Endian byte order if no BOM is available.
517
	 * This function was taken from http://php.net/manual/en/function.utf8-decode.php
518
	 * and $bom_be parameter added.
519
	 *
520
	 * @param   string  $str  UTF-16 encoded data to decode.
521
	 * @return  string  UTF-8 / ISO encoded data.
522
	 * @access  public
523
	 * @version 0.2 / 2010-05-13
524
	 * @author  Rasmus Andersson {@link http://rasmusandersson.se/}
525
	 * @author vadik56
526
	 */
527
	public static function utf16_decode($str, $bom_be = TRUE) {
528
		if( strlen($str) < 2 ) return $str;
529
		$c0 = ord($str{0});
530
		$c1 = ord($str{1});
531
		if( $c0 == 0xfe && $c1 == 0xff ) { $str = substr($str,2); }
532
		elseif( $c0 == 0xff && $c1 == 0xfe ) { $str = substr($str,2); $bom_be = false; }
533
		$len = strlen($str);
534
		$newstr = '';
535
		for($i=0;$i<$len;$i+=2) {
536
			if( $bom_be ) { $val = ord($str{$i})   << 4; $val += ord($str{$i+1}); }
537
			else {        $val = ord($str{$i+1}) << 4; $val += ord($str{$i}); }
538
			$newstr .= ($val == 0x228) ? "\n" : chr($val);
539
		}
540
		return $newstr;
541
	}
542
 
543
	/**
544
	 * Get character count. First try mbstring, then iconv, finally strlen
545
	 *
546
	 * @param string $value
547
	 * @param string $enc Encoding
548
	 * @return int Character count
549
	 */
550
	public static function CountCharacters($value, $enc = 'UTF-8')
551
	{
552
		if (self::getIsMbstringEnabled()) {
553
			return mb_strlen($value, $enc);
554
		}
555
 
556
		if (self::getIsIconvEnabled()) {
557
			return iconv_strlen($value, $enc);
558
		}
559
 
560
		// else strlen
561
		return strlen($value);
562
	}
563
 
564
	/**
565
	 * Get a substring of a UTF-8 encoded string. First try mbstring, then iconv, finally strlen
566
	 *
567
	 * @param string $pValue UTF-8 encoded string
568
	 * @param int $pStart Start offset
569
	 * @param int $pLength Maximum number of characters in substring
570
	 * @return string
571
	 */
572
	public static function Substring($pValue = '', $pStart = 0, $pLength = 0)
573
	{
574
		if (self::getIsMbstringEnabled()) {
575
			return mb_substr($pValue, $pStart, $pLength, 'UTF-8');
576
		}
577
 
578
		if (self::getIsIconvEnabled()) {
579
			return iconv_substr($pValue, $pStart, $pLength, 'UTF-8');
580
		}
581
 
582
		// else substr
583
		return substr($pValue, $pStart, $pLength);
584
	}
585
 
586
	/**
587
	 * Convert a UTF-8 encoded string to upper case
588
	 *
589
	 * @param string $pValue UTF-8 encoded string
590
	 * @return string
591
	 */
592
	public static function StrToUpper($pValue = '')
593
	{
594
		if (function_exists('mb_convert_case')) {
595
			return mb_convert_case($pValue, MB_CASE_UPPER, "UTF-8");
596
		}
597
		return strtoupper($pValue);
598
	}
599
 
600
	/**
601
	 * Convert a UTF-8 encoded string to lower case
602
	 *
603
	 * @param string $pValue UTF-8 encoded string
604
	 * @return string
605
	 */
606
	public static function StrToLower($pValue = '')
607
	{
608
		if (function_exists('mb_convert_case')) {
609
			return mb_convert_case($pValue, MB_CASE_LOWER, "UTF-8");
610
		}
611
		return strtolower($pValue);
612
	}
613
 
614
	/**
615
	 * Convert a UTF-8 encoded string to title/proper case
616
	 *    (uppercase every first character in each word, lower case all other characters)
617
	 *
618
	 * @param string $pValue UTF-8 encoded string
619
	 * @return string
620
	 */
621
	public static function StrToTitle($pValue = '')
622
	{
623
		if (function_exists('mb_convert_case')) {
624
			return mb_convert_case($pValue, MB_CASE_TITLE, "UTF-8");
625
		}
626
		return ucwords($pValue);
627
	}
628
 
629
	/**
630
	 * Identify whether a string contains a fractional numeric value,
631
	 *    and convert it to a numeric if it is
632
	 *
633
	 * @param string &$operand string value to test
634
	 * @return boolean
635
	 */
636
	public static function convertToNumberIfFraction(&$operand) {
637
		if (preg_match('/^'.self::STRING_REGEXP_FRACTION.'$/i', $operand, $match)) {
638
			$sign = ($match[1] == '-') ? '-' : '+';
639
			$fractionFormula = '='.$sign.$match[2].$sign.$match[3];
640
			$operand = PHPExcel_Calculation::getInstance()->_calculateFormulaValue($fractionFormula);
641
			return true;
642
		}
643
		return false;
644
	}	//	function convertToNumberIfFraction()
645
 
646
	/**
647
	 * Get the decimal separator. If it has not yet been set explicitly, try to obtain number
648
	 * formatting information from locale.
649
	 *
650
	 * @return string
651
	 */
652
	public static function getDecimalSeparator()
653
	{
654
		if (!isset(self::$_decimalSeparator)) {
655
			$localeconv = localeconv();
656
			self::$_decimalSeparator = ($localeconv['decimal_point'] != '')
657
				? $localeconv['decimal_point'] : $localeconv['mon_decimal_point'];
658
 
659
			if (self::$_decimalSeparator == '') {
660
				// Default to .
661
				self::$_decimalSeparator = '.';
662
			}
663
		}
664
		return self::$_decimalSeparator;
665
	}
666
 
667
	/**
668
	 * Set the decimal separator. Only used by PHPExcel_Style_NumberFormat::toFormattedString()
669
	 * to format output by PHPExcel_Writer_HTML and PHPExcel_Writer_PDF
670
	 *
671
	 * @param string $pValue Character for decimal separator
672
	 */
673
	public static function setDecimalSeparator($pValue = '.')
674
	{
675
		self::$_decimalSeparator = $pValue;
676
	}
677
 
678
	/**
679
	 * Get the thousands separator. If it has not yet been set explicitly, try to obtain number
680
	 * formatting information from locale.
681
	 *
682
	 * @return string
683
	 */
684
	public static function getThousandsSeparator()
685
	{
686
		if (!isset(self::$_thousandsSeparator)) {
687
			$localeconv = localeconv();
688
			self::$_thousandsSeparator = ($localeconv['thousands_sep'] != '')
689
				? $localeconv['thousands_sep'] : $localeconv['mon_thousands_sep'];
690
 
691
			if (self::$_thousandsSeparator == '') {
692
				// Default to .
693
				self::$_thousandsSeparator = ',';
694
			}
695
		}
696
		return self::$_thousandsSeparator;
697
	}
698
 
699
	/**
700
	 * Set the thousands separator. Only used by PHPExcel_Style_NumberFormat::toFormattedString()
701
	 * to format output by PHPExcel_Writer_HTML and PHPExcel_Writer_PDF
702
	 *
703
	 * @param string $pValue Character for thousands separator
704
	 */
705
	public static function setThousandsSeparator($pValue = ',')
706
	{
707
		self::$_thousandsSeparator = $pValue;
708
	}
709
 
710
	/**
711
	 *	Get the currency code. If it has not yet been set explicitly, try to obtain the
712
	 *		symbol information from locale.
713
	 *
714
	 * @return string
715
	 */
716
	public static function getCurrencyCode()
717
	{
718
		if (!isset(self::$_currencyCode)) {
719
			$localeconv = localeconv();
720
			self::$_currencyCode = ($localeconv['currency_symbol'] != '')
721
				? $localeconv['currency_symbol'] : $localeconv['int_curr_symbol'];
722
 
723
			if (self::$_currencyCode == '') {
724
				// Default to $
725
				self::$_currencyCode = '$';
726
			}
727
		}
728
		return self::$_currencyCode;
729
	}
730
 
731
	/**
732
	 * Set the currency code. Only used by PHPExcel_Style_NumberFormat::toFormattedString()
733
	 *		to format output by PHPExcel_Writer_HTML and PHPExcel_Writer_PDF
734
	 *
735
	 * @param string $pValue Character for currency code
736
	 */
737
	public static function setCurrencyCode($pValue = '$')
738
	{
739
		self::$_currencyCode = $pValue;
740
	}
741
 
742
	/**
743
	 * Convert SYLK encoded string to UTF-8
744
	 *
745
	 * @param string $pValue
746
	 * @return string UTF-8 encoded string
747
	 */
748
	public static function SYLKtoUTF8($pValue = '')
749
	{
750
		// If there is no escape character in the string there is nothing to do
751
		if (strpos($pValue, '') === false) {
752
			return $pValue;
753
		}
754
 
755
		foreach (self::$_SYLKCharacters as $k => $v) {
756
			$pValue = str_replace($k, $v, $pValue);
757
		}
758
 
759
		return $pValue;
760
	}
761
 
762
	/**
763
	 * Retrieve any leading numeric part of a string, or return the full string if no leading numeric
764
	 *	(handles basic integer or float, but not exponent or non decimal)
765
	 *
766
	 * @param	string	$value
767
	 * @return	mixed	string or only the leading numeric part of the string
768
	 */
769
	public static function testStringAsNumeric($value)
770
	{
771
		if (is_numeric($value))
772
			return $value;
773
		$v = floatval($value);
774
		return (is_numeric(substr($value,0,strlen($v)))) ? $v : $value;
775
	}
776
}