最近需要在HTML的内容中提取一段文本作为简介,如果用普通的办法提取那么将有可能出现截取了半个HTML标志的情况,会破坏页面布局, 为此添加了这么一个函数,可完美解决此问题!!注意在这里你截取的字符数是不含HTML标志的!!- <?php
. q4 \, f3 D+ _4 B* B7 W - /**
1 ~7 h; O! y5 I% \: m4 J) N, ? - * 截取HTML字符串 允许忽略HTML标志不计
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- * Author:学无止境
* c3 w: }+ r2 _' r/ F7 R2 j) Y - * Email:xjtdy888@163.com ' }) z5 n& H: N9 |
- * QQ: 339534039
- I: K1 e2 m+ @8 W$ _ - * Home:http://www.phpos.org
$ o& I8 K3 j6 t+ R/ m- W - * Blog:http://hi.baidu.com/phps
0 N$ l! h; P- M) y! F% S" Z - * . Y) [& u8 L; ~' N" P# P0 s
- * 转载请保留作者信息 ) M& g4 h @, A( C( M9 r& P
- 0 W9 B, t1 Y) p& _, { x" o1 m
- *
3 L# m" G) B: n - * @param 要截取的HTML $str
9 i3 @: N( P4 n d: K - * @param 截取的数量 $num 6 L: y7 u3 L9 b6 K# X. O
- * @param 是否需要加上更多 $more * c9 b/ U7 D% \
- * @return 截取串 & b. z5 r* t" J) ?
- */
* v7 Q# ^: h3 Y0 } - function phpos_chsubstr_ahtml($str,$num,$more=false)
- q' Q+ _, [) Z% q' } V - {
) G+ R$ [% D" u$ S - $leng=strlen($str); 7 K+ T3 ]0 p' r3 b! b
- if($num>=$leng) return $str;
8 |0 W1 y7 }; K$ r5 }/ W) z - $word=0; 8 R5 a9 k1 V- a
- $i=0; /** 字符串指针 **/
& v' v% v* W0 `/ T0 z% l, _$ | - $stag=array(array()); /** 存放开始HTML的标志 **/
) m5 w5 o" @, x0 y' a* H - $etag=array(array()); /** 存放结束HTML的标志 **/ + F4 r6 R8 f/ ]5 Y# z* @. z
- $sp = 0;
- D% X& d0 d: [* m9 v( A - $ep = 0;
- B4 O: Y+ V" ~% m x - while($word!=$num) 8 V1 A( S4 U6 J: t7 ?- Y- v2 `; p
- { # B0 C! K& X" `1 D% E
- 0 r0 x6 ~& H2 [7 S
- if(ord($str[$i])>128)
# U V/ k, B7 A0 G. ?" ? - {
" }" e1 C" W# R" W' q - //$re.=substr($str,$i,3); : b# D4 }. D, h! ]* t0 z( [
- $i+=3;
7 c# R7 Y4 _9 \+ m7 n$ _ - $word++;
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- else if ($str[$i]=='<')
# ~4 o% |* G2 H. Y/ U# b# n" M# r. D# ] - {
1 ~% H, M- f2 @ C' P7 @7 Z7 r - if ($str[$i+1] == '!')
5 U4 |+ l# H: Y) i5 A, s - {
) [2 A1 c$ W3 g- _* D( z, N1 p - $i++;
# n8 _& s0 L3 P5 p - continue; 9 ~- n6 U5 ]/ Q" x' ^$ L
- }
" ?4 E7 |, W; h% t0 _1 H8 l -
) a5 H5 G+ P9 t/ A - if ($str[$i+1]=='/')
7 R8 d- `) v$ Y6 k- b3 M. k - {
( y" v5 c% y' k& y/ F - $ptag=$etag ; * _- C; v2 q: ]" t! x
- $k=$ep;
# l" N2 m5 ]6 X - $i+=2; ' D& x/ r8 e& @
- } : p$ k+ I. d& G8 n
- else , L( o8 u8 t) Q4 U; T
- {
3 W) m: J, ]( p/ B Z - $ptag=$stag;
' L7 d. h1 e) R1 F$ d$ \0 h* D9 W4 p - $i+=1; 6 P/ c- Z% ^/ }* d
- $k=$sp; # `: x2 ]+ t6 d/ ^) k7 c7 [
- } / M |+ q3 q+ m+ v
-
9 @4 v4 u ~% ]: X- }" d' j2 e! q8 T - for(;$i<$leng;$i++) ; |% b& V9 ]0 Y) s& x) r
- { " h' A0 z" O+ p( \7 J1 s4 V! i
- if ($str[$i] == ' ') 0 Z; L3 E7 D8 Y& s8 ]& z
- { 9 ?$ o" Z: f$ Y$ }$ j
- $ptag[$k] = implode('',$ptag[$k]);
* S% n$ W) h9 }* f( b! X; k4 u+ A - $k++; 0 l$ `$ R) q7 L- m
- break; ! q* Q; A- K( D9 d' m% c) \
- } / ?# ^9 o! y. c) V
- if ($str[$i] != '>')
; S# P3 r& I2 V: ^ - {
3 Y6 h9 @, G, S! H - $ptag[$k][]=$str[$i]; 9 O4 h$ |) I, ^( @% o$ ]6 x2 F
- continue;
+ P/ f0 M7 U6 p - }
0 i) t0 |1 o, I2 e( P! i8 b - else 6 w/ p" U5 a2 h2 K$ R, _
- {
: E5 R. v) X& W4 @ - $ptag[$k] = implode('',$ptag[$k]); % \, e" i" ?1 z# d
- $k++; . |' Y/ B" f% \- S; M( ]
- break; ' T$ t6 C0 b3 k' {. S6 @# c
- } 2 ]9 J; F( K; r" z3 Y8 Z+ N
- }
6 y4 m6 G. C- J. j' O1 B - $i++; k: [8 u0 K" D9 d6 `& L, M
- continue; 7 ]: X, s9 Y2 \
- }
# e) v+ o8 ]7 ]6 f+ O - else 9 L' {; S7 u6 [1 ]
- {
2 |' L9 }& r. O% J1 K& z - //$re.=substr($str,$i,1); 1 a2 m" q; G A* z! r9 Q" S
- $word++; - J- S, f2 O* Z( g) W5 P' r! U
- $i++;
W% l9 P. ]3 U$ ] - }
" Q+ D- ^# s R& V+ E# R9 r - } " U" t+ M6 O. k6 L# }
- foreach ($etag as $val)
4 k, s, B" B* ?' o. H' D: @ - {
+ w1 E7 ?7 ~/ D& T' p$ ~' N# o, w; E1 \ - $key1=array_search($val,$stag);
4 b: ^/ l4 a6 Z4 D - if ($key1 !== false) unset($stag[$key]);
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- foreach ($stag as $key => $val)
- g' m! i. L1 L2 {8 C1 [ - { : f6 ~. N3 C) N( C! }: \
- if (in_array($val,array('br','img'))) unset($stag[$key1]); , x) U6 H( A& ^% B
- } & ], O( `; G; g3 ~
- array_reverse($stag);
7 _ x( P! i, `8 w$ R/ t - $ends = '</'.implode('></',$stag).'>'; ( D T# o% \, W
- $re = substr($str,0,$i).$ends; " b; V9 s1 V+ p- p' c* O' A
- if($more) $re.='...';
1 @; l. p* G' i$ K - return $re;
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- / o: `8 y8 n' Q4 y5 i
- $str=<<<EOF
2 i# l S! B6 K% E2 o( x1 V H. g% n2 @ - <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3>
2 N5 J; U: c% Y0 ~& S( W) M+ Y - <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p>
# Z4 @! W A- H# o1 m3 U - <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p>
0 v, w' x* S0 Y, b; `- {4 U - <h3>What is Free Software?</h3>
2 k# \' g3 C' W* l' J - <p>“<a href="http://www.gnu.org/philosophy/free-sw.html">Free software</a>” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.</p> k0 F; o0 r0 L
- <p>Free software is a matter of the users' freedom to run, copy, distribute, study, change and improve the software. More precisely, it refers to four kinds of freedom, for the users of the software:</p>
% G' I: {$ j; A+ L" _' Z L - <ul>
4 R# M( D% I+ S; D- p& t# | - <li>The freedom to run the program, for any purpose (freedom 0). </li>
: ^. X6 N ]6 N! k4 j" n1 }8 j - <li>The freedom to study how the program works, and adapt it to your needs (freedom 1). Access to the source code is a precondition for this. </li> * Q; H# m5 A& k) Y; Q' w. \+ C) F
- <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
! |4 @# W8 F9 v# q# K6 p - <li>The freedom to improve the program, and release your improvements to the public, so that the whole community benefits (freedom 3). Access to the source code is a precondition for this. </li>
$ T5 f# O6 w7 j7 b - </ul>
5 u @' E9 z* H3 b+ N - <h3>What is the Free Software Foundation?</h3> 3 Z- u6 R3 }2 |6 ~1 G0 H0 S6 k3 u: D
- <p>The <a href="http://www.fsf.org/">Free Software Foundation</a> (<abbr title="Free Software Foundation">) is the principal organizational sponsor of the Project. The receives very little funding from corporations or grant-making foundations, but relies on support from individuals like you. </abbr>) is the principal organizational sponsor of the Project. The receives very little funding from corporations or grant-making foundations, but relies on support from individuals like you. </p> $ `& l/ v: r/ L; q! r* C# N& e
- <p>Please consider helping the <abbr>by , or by . If you use Free Software in your business, you can also consider or as a way to support the . </abbr>by , or by . If you use Free Software in your business, you can also consider or as a way to support the . </p>
@4 E& P6 Z5 d - <p>The <acronym>GNU</acronym> project supports the mission of the <abbr>to preserve, protect and promote the freedom to use, study, copy, modify, and redistribute computer software, and to defend the rights of Free Software users. We support the on the Internet, , and the unimpeded by private monopolies. You can also learn more about these issues in the book . </abbr>to preserve, protect and promote the freedom to use, study, copy, modify, and redistribute computer software, and to defend the rights of Free Software users. We support the on the Internet, , and the unimpeded by private monopolies. You can also learn more about these issues in the book . </p> 5 k$ {# F% v7 ` x4 T: O; L
- <!--
: a* T/ F, ]0 O: W$ W$ T: P2 l - Keep link lines at 72 characters or lynx will break them poorly ! s& f; ]. ?: o: |
- Obviously, we list ONLY the most useful/important URLs here
3 ~2 l, s* h$ @' \0 y - Keep it short and sweet: 3 lines and 2 columns is already enough
" r4 S: z0 M+ N2 U - --><!-- BEGIN GNUmenu -->
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- echo phpos_chsubstr_ahtml($str,800); " ` g, ?+ h! F( \
- ?> & Y5 W9 U- w" w( F- v- {7 ~7 V
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