1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
<?php
namespace dokuwiki\Utf8;
/**
* Convert between UTF-8 and a list of Unicode Code Points
*/
class Unicode
{
/**
* Takes an UTF-8 string and returns an array of ints representing the
* Unicode characters. Astral planes are supported ie. the ints in the
* output can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates
* are not allowed.
*
* If $strict is set to true the function returns false if the input
* string isn't a valid UTF-8 octet sequence and raises a PHP error at
* level E_USER_WARNING
*
* Note: this function has been modified slightly in this library to
* trigger errors on encountering bad bytes
*
* @author <hsivonen@iki.fi>
* @author Harry Fuecks <hfuecks@gmail.com>
* @see unicode_to_utf8
* @link http://hsivonen.iki.fi/php-utf8/
* @link http://sourceforge.net/projects/phputf8/
* @todo break into less complex chunks
* @todo use exceptions instead of user errors
*
* @param string $str UTF-8 encoded string
* @param boolean $strict Check for invalid sequences?
* @return mixed array of unicode code points or false if UTF-8 invalid
*/
public static function fromUtf8($str, $strict = false)
{
$mState = 0; // cached expected number of octets after the current octet
// until the beginning of the next UTF8 character sequence
$mUcs4 = 0; // cached Unicode character
$mBytes = 1; // cached expected number of octets in the current sequence
$out = array();
$len = strlen($str);
for ($i = 0; $i < $len; $i++) {
$in = ord($str[$i]);
if ($mState === 0) {
// When mState is zero we expect either a US-ASCII character or a
// multi-octet sequence.
if (0 === (0x80 & $in)) {
// US-ASCII, pass straight through.
$out[] = $in;
$mBytes = 1;
} else if (0xC0 === (0xE0 & $in)) {
// First octet of 2 octet sequence
$mUcs4 = $in;
$mUcs4 = ($mUcs4 & 0x1F) << 6;
$mState = 1;
$mBytes = 2;
} else if (0xE0 === (0xF0 & $in)) {
// First octet of 3 octet sequence
$mUcs4 = $in;
$mUcs4 = ($mUcs4 & 0x0F) << 12;
$mState = 2;
$mBytes = 3;
} else if (0xF0 === (0xF8 & $in)) {
// First octet of 4 octet sequence
$mUcs4 = $in;
$mUcs4 = ($mUcs4 & 0x07) << 18;
$mState = 3;
$mBytes = 4;
} else if (0xF8 === (0xFC & $in)) {
/* First octet of 5 octet sequence.
*
* This is illegal because the encoded codepoint must be either
* (a) not the shortest form or
* (b) outside the Unicode range of 0-0x10FFFF.
* Rather than trying to resynchronize, we will carry on until the end
* of the sequence and let the later error handling code catch it.
*/
$mUcs4 = $in;
$mUcs4 = ($mUcs4 & 0x03) << 24;
$mState = 4;
$mBytes = 5;
} else if (0xFC === (0xFE & $in)) {
// First octet of 6 octet sequence, see comments for 5 octet sequence.
$mUcs4 = $in;
$mUcs4 = ($mUcs4 & 1) << 30;
$mState = 5;
$mBytes = 6;
} elseif ($strict) {
/* Current octet is neither in the US-ASCII range nor a legal first
* octet of a multi-octet sequence.
*/
trigger_error(
'utf8_to_unicode: Illegal sequence identifier ' .
'in UTF-8 at byte ' . $i,
E_USER_WARNING
);
return false;
}
} else {
// When mState is non-zero, we expect a continuation of the multi-octet
// sequence
if (0x80 === (0xC0 & $in)) {
// Legal continuation.
$shift = ($mState - 1) * 6;
$tmp = $in;
$tmp = ($tmp & 0x0000003F) << $shift;
$mUcs4 |= $tmp;
/**
* End of the multi-octet sequence. mUcs4 now contains the final
* Unicode codepoint to be output
*/
if (0 === --$mState) {
/*
* Check for illegal sequences and codepoints.
*/
// From Unicode 3.1, non-shortest form is illegal
if (((2 === $mBytes) && ($mUcs4 < 0x0080)) ||
((3 === $mBytes) && ($mUcs4 < 0x0800)) ||
((4 === $mBytes) && ($mUcs4 < 0x10000)) ||
(4 < $mBytes) ||
// From Unicode 3.2, surrogate characters are illegal
(($mUcs4 & 0xFFFFF800) === 0xD800) ||
// Codepoints outside the Unicode range are illegal
($mUcs4 > 0x10FFFF)) {
if ($strict) {
trigger_error(
'utf8_to_unicode: Illegal sequence or codepoint ' .
'in UTF-8 at byte ' . $i,
E_USER_WARNING
);
return false;
}
}
if (0xFEFF !== $mUcs4) {
// BOM is legal but we don't want to output it
$out[] = $mUcs4;
}
//initialize UTF8 cache
$mState = 0;
$mUcs4 = 0;
$mBytes = 1;
}
} elseif ($strict) {
/**
*((0xC0 & (*in) != 0x80) && (mState != 0))
* Incomplete multi-octet sequence.
*/
trigger_error(
'utf8_to_unicode: Incomplete multi-octet ' .
' sequence in UTF-8 at byte ' . $i,
E_USER_WARNING
);
return false;
}
}
}
return $out;
}
/**
* Takes an array of ints representing the Unicode characters and returns
* a UTF-8 string. Astral planes are supported ie. the ints in the
* input can be > 0xFFFF. Occurrances of the BOM are ignored. Surrogates
* are not allowed.
*
* If $strict is set to true the function returns false if the input
* array contains ints that represent surrogates or are outside the
* Unicode range and raises a PHP error at level E_USER_WARNING
*
* Note: this function has been modified slightly in this library to use
* output buffering to concatenate the UTF-8 string (faster) as well as
* reference the array by it's keys
*
* @param array $arr of unicode code points representing a string
* @param boolean $strict Check for invalid sequences?
* @return string|false UTF-8 string or false if array contains invalid code points
*
* @author <hsivonen@iki.fi>
* @author Harry Fuecks <hfuecks@gmail.com>
* @see utf8_to_unicode
* @link http://hsivonen.iki.fi/php-utf8/
* @link http://sourceforge.net/projects/phputf8/
* @todo use exceptions instead of user errors
*/
public static function toUtf8($arr, $strict = false)
{
if (!is_array($arr)) return '';
ob_start();
foreach (array_keys($arr) as $k) {
if (($arr[$k] >= 0) && ($arr[$k] <= 0x007f)) {
# ASCII range (including control chars)
echo chr($arr[$k]);
} else if ($arr[$k] <= 0x07ff) {
# 2 byte sequence
echo chr(0xc0 | ($arr[$k] >> 6));
echo chr(0x80 | ($arr[$k] & 0x003f));
} else if ($arr[$k] == 0xFEFF) {
# Byte order mark (skip)
// nop -- zap the BOM
} else if ($arr[$k] >= 0xD800 && $arr[$k] <= 0xDFFF) {
# Test for illegal surrogates
// found a surrogate
if ($strict) {
trigger_error(
'unicode_to_utf8: Illegal surrogate ' .
'at index: ' . $k . ', value: ' . $arr[$k],
E_USER_WARNING
);
return false;
}
} else if ($arr[$k] <= 0xffff) {
# 3 byte sequence
echo chr(0xe0 | ($arr[$k] >> 12));
echo chr(0x80 | (($arr[$k] >> 6) & 0x003f));
echo chr(0x80 | ($arr[$k] & 0x003f));
} else if ($arr[$k] <= 0x10ffff) {
# 4 byte sequence
echo chr(0xf0 | ($arr[$k] >> 18));
echo chr(0x80 | (($arr[$k] >> 12) & 0x3f));
echo chr(0x80 | (($arr[$k] >> 6) & 0x3f));
echo chr(0x80 | ($arr[$k] & 0x3f));
} elseif ($strict) {
trigger_error(
'unicode_to_utf8: Codepoint out of Unicode range ' .
'at index: ' . $k . ', value: ' . $arr[$k],
E_USER_WARNING
);
// out of range
return false;
}
}
return ob_get_clean();
}
}
|
