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 8 ?, U3 V7 q8 P2 p6 M$ J
- /** * S- L" @/ v/ }
- * 截取HTML字符串 允许忽略HTML标志不计
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- * Author:学无止境 * G l0 d2 B1 p( w7 u9 Z
- * Email:xjtdy888@163.com
7 Q0 Q6 W' k1 y F - * QQ: 339534039 y, D: ?* V% k: H$ h
- * Home:http://www.phpos.org
% Y& d K; s! W4 |6 V7 W8 [$ ~5 x - * Blog:http://hi.baidu.com/phps
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- * 转载请保留作者信息 - K2 K7 c4 f5 d5 t5 p6 G, \3 l
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- * 3 Y0 U; C- n b
- * @param 要截取的HTML $str 0 v+ u! S* m, N: i4 i4 }) I- Y R
- * @param 截取的数量 $num ! p7 W( p1 J. u
- * @param 是否需要加上更多 $more - k( I7 k; j! x) c& w
- * @return 截取串
) E7 b+ S* E; ^2 k% O7 H% g - */
! W& G2 z" }6 ~- m! p8 S - function phpos_chsubstr_ahtml($str,$num,$more=false) " L, M& G. a+ ^, k+ m5 O2 y* W
- { 5 U8 B& i3 B0 U" G8 g9 S
- $leng=strlen($str);
! f8 R7 q! e+ a - if($num>=$leng) return $str;
- z+ C5 Q; i5 _ - $word=0;
$ ~0 k9 g: o: ~7 g9 K/ N6 i - $i=0; /** 字符串指针 **/
! R2 o9 a& d! K- V5 _% c - $stag=array(array()); /** 存放开始HTML的标志 **/
0 o9 N7 n! F+ t - $etag=array(array()); /** 存放结束HTML的标志 **/
* B! p* R6 V4 V) l9 U - $sp = 0; 0 m9 { W! A" r2 y: L+ O
- $ep = 0;
g; E% w1 C B( `; ]. y% U* H - while($word!=$num) 6 ^1 Q* } U. R) K
- { + L# D) z% w! Y$ o7 r
- 4 {! N' ?8 G1 y
- if(ord($str[$i])>128)
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- //$re.=substr($str,$i,3);
; l5 I& m3 c9 _: ~$ k: I - $i+=3; 0 J7 v1 E" ^4 ]8 ]% n6 N
- $word++; 8 t1 a0 Y- s k' ^# q; h
- }
2 y" ?6 f8 i2 r. A9 B% t - else if ($str[$i]=='<') : w5 g8 O+ [0 {' ~
- {
+ h. B+ k! G/ F7 i; l3 z - if ($str[$i+1] == '!') ) R: o9 ]$ v3 {1 i2 L& \0 q
- { . m0 B' v+ z6 A( }
- $i++; * o# s9 Z( I' W8 y. j1 {
- continue;
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- if ($str[$i+1]=='/')
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- $ptag=$etag ;
, I7 d# ?% f. t0 e! A - $k=$ep; 8 Z5 F, z3 k; }3 J9 w7 ?
- $i+=2;
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- else
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" r+ @: f9 O" q5 K5 a5 g - $ptag=$stag;
4 H) K% m; F- \) ] - $i+=1; 9 I! x" {1 M, y6 ^1 Q2 J
- $k=$sp; ; ~. H8 |+ B) K+ |( z
- }
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. ]' X9 y" _9 O# M1 e- E - for(;$i<$leng;$i++)
( Y. L- I8 }$ E1 B - {
2 O; g* F0 s" p* ^7 y/ P - if ($str[$i] == ' ') , k- p* O) l7 H. n8 ^
- { ! q# ^% ~! s6 Z0 c
- $ptag[$k] = implode('',$ptag[$k]); ; I$ M+ e. L. J9 G
- $k++; 1 L' W, \ L, L" O: N
- break;
5 M9 ?& O5 Z8 t0 r8 _ - }
* x% o }( W6 z. G4 W. \ - if ($str[$i] != '>') ; _. G7 j& w# Q6 J5 n, b+ L
- {
( a2 z( G, w/ z8 Y5 O0 T" ~9 a! k1 P - $ptag[$k][]=$str[$i];
8 G2 Q6 w2 D6 Q! _# V' o - continue;
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- else 5 R" x" w, }6 q6 N, d0 e
- { & x0 [- n9 n7 j. q) }
- $ptag[$k] = implode('',$ptag[$k]); ! l& q- \/ z" `- C: n2 o1 u
- $k++; & ~! y& j4 M' n+ ~1 H$ t
- break;
/ k! U$ A7 U& l) B; u - }
8 \" T, }/ z% k! H3 r - }
% [1 x: ~ i' A- [ - $i++;
' [: C" \) F* s) v8 T" X1 J6 J - continue; + K. I5 [* }+ `& p( N' K _
- } 2 \, d! _: F2 \' a
- else 5 z6 h) |/ ~) b: k [, L+ W
- {
& A* V1 f% ^3 T0 t! o - //$re.=substr($str,$i,1); * N/ V0 \) u2 c, T
- $word++;
9 _5 n- t- _8 K! G - $i++; 2 T3 u, Q+ H- H5 Q" u
- } ! x0 Q% o- n0 b. p8 k1 C6 y' ~
- }
{8 ^) c/ @2 A0 R& A - foreach ($etag as $val)
( a9 v* ` ^2 F; { - {
+ n$ k5 X6 i5 y1 X% ~* k2 w - $key1=array_search($val,$stag); * X* C% @& A+ G A
- if ($key1 !== false) unset($stag[$key]);
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- foreach ($stag as $key => $val) 4 c4 k5 G) x8 |) T
- { & a6 q6 B7 A7 @8 }; A
- if (in_array($val,array('br','img'))) unset($stag[$key1]); 0 Z7 ]' g4 c, m! Y- d1 U( h \' J
- }
7 I6 ]3 R3 S* r# o, i. O6 S - array_reverse($stag); $ e$ C* T( ^0 w8 T k$ \( E
- $ends = '</'.implode('></',$stag).'>';
' R3 e U3 l) @8 | - $re = substr($str,0,$i).$ends; + ?& P/ |9 _! g/ \
- if($more) $re.='...'; ' \& V! J4 {8 A8 Z
- return $re;
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- $str=<<<EOF % \2 F) B) B3 }- J2 J* z. r; S
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> 3 f( T; p. C1 X# Y" j
- <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p>
8 t) N$ L2 S, c* }! t8 {/ h( k" R - <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>
: p8 [' j0 r1 a1 F - <h3>What is Free Software?</h3> ; O2 C5 @( c8 s" r- a7 R
- <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>
5 N7 T0 n# F+ q2 S- k - <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> + C. h0 q0 a: F' M0 s5 D
- <ul> $ Y/ D/ R* L5 D& L+ z. R
- <li>The freedom to run the program, for any purpose (freedom 0). </li>
* i2 Q0 k x' d3 d, M - <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>
7 r5 B T+ T$ G# K1 [2 S, ?) w6 t, w - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
% y1 k; @/ y1 P5 g" z - <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> ' O# P- W" w# Q. B) Q8 @1 Z
- </ul> ' U% L( [/ _7 z8 H( b- S; U/ X7 a1 W
- <h3>What is the Free Software Foundation?</h3>
; y& K+ \3 p* g' M1 G/ a+ }% C& K - <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> / h+ R* x f: Y" Y$ e5 B8 V& D
- <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>
6 O" f8 q9 [# b h) F - <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>
9 l* f# ~1 T2 r6 S - <!-- 5 @, M# b# z; n
- Keep link lines at 72 characters or lynx will break them poorly & } A) F1 w, E0 k
- Obviously, we list ONLY the most useful/important URLs here 9 N' Q) l; ^, v7 O
- Keep it short and sweet: 3 lines and 2 columns is already enough : r( [ F5 i4 O' i% ]& V7 N
- --><!-- BEGIN GNUmenu -->
& y* |; ^; Y5 d- S+ ^ - EOF;
) l1 p1 h. n* E/ [* \. E - echo phpos_chsubstr_ahtml($str,800); 5 q/ J7 s i- q' i N
- ?>
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