php中文字符串截取 php截取中文字符串的代码

3. /**

4. @截取中文字符串 适用于GB2312编码
5. @http://bbs.it-home.org
6. */
7. function FSubstr($title,$start,$len="",$magic=true)
8. {
9. $length = 0;
10. if($len == "") $len = strlen($title);

11. //判断起始为不正确位置

12. if($start > 0)
13. {
14. $cnum = 0;
15. for($i=0;$i{
16. if(ord(substr($title,$i,1)) >= 128) $cnum ++;
17. }
18. if($cnum%2 != 0) $start--;

19. unset($cnum);

20. }

21. if(strlen($title)

22. $alen = 0;

23. $blen = 0;

24. $realnum = 0;

25. for($i=$start;$i{

26. $ctype = 0;
27. $cstep = 0;
28. $cur = substr($title,$i,1);
29. if($cur == "&")
30. {
31. if(substr($title,$i,4) == "{
32. $cstep = 4;
33. $length += 4;
34. $i += 3;
35. $realnum ++;
36. if($magic)
37. {
38. $alen ++;
39. }
40. }
41. else if(substr($title,$i,4) == ">")
42. {
43. $cstep = 4;
44. $length += 4;
45. $i += 3;
46. $realnum ++;
47. if($magic)
48. {
49. $alen ++;
50. }
51. }
52. else if(substr($title,$i,5) == "&")
53. {
54. $cstep = 5;
55. $length += 5;
56. $i += 4;
57. $realnum ++;
58. if($magic)
59. {
60. $alen ++;
61. }
62. }
63. else if(substr($title,$i,6) == """)
64. {
65. $cstep = 6;
66. $length += 6;
67. $i += 5;
68. $realnum ++;
69. if($magic)
70. {
71. $alen ++;
72. }
73. }
74. else if(substr($title,$i,6) == "'")
75. {
76. $cstep = 6;
77. $length += 6;
78. $i += 5;
79. $realnum ++;
80. if($magic)
81. {
82. $alen ++;
83. }
84. }
85. else if(preg_match("/(\d+);/i",substr($title,$i,8),$match))
86. {
87. $cstep = strlen($match[0]);
88. $length += strlen($match[0]);
89. $i += strlen($match[0])-1;
90. $realnum ++;
91. if($magic)
92. {
93. $blen ++;
94. $ctype = 1;
95. }
96. }
97. }else{
98. if(ord($cur)>=128)
99. {
100. $cstep = 2;
101. $length += 2;
102. $i += 1;
103. $realnum ++;
104. if($magic)
105. {
106. $blen ++;
107. $ctype = 1;
108. }
109. }else{
110. $cstep = 1;
111. $length +=1;
112. $realnum ++;
113. if($magic)
114. {
115. $alen++;
116. }
117. }
118. }

119. if($magic)

120. {
121. if(($blen*2+$alen) == ($len*2)) break;
122. if(($blen*2+$alen) == ($len*2+1))
123. {
124. if($ctype == 1)
125. {
126. $length -= $cstep;
127. break;
128. }else{
129. break;
130. }
131. }
132. }else{
133. if($realnum == $len) break;
134. }
135. }

136. unset($cur);

137. unset($alen);
138. unset($blen);
139. unset($realnum);
140. unset($ctype);
141. unset($cstep);

142. return substr($title,$start,$length);

143. }
144. ?>

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