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
; o% |! o. B% R4 x7 F - /**
$ m" r9 }& H4 z4 I7 Q L$ e6 s7 r - * 截取HTML字符串 允许忽略HTML标志不计
2 @- e% r9 s4 ?" u - * ) e$ J# W$ d! M
- * Author:学无止境
& b9 k" g+ F0 O2 T0 f - * Email:xjtdy888@163.com ; O: c6 P1 T) O7 c
- * QQ: 339534039 7 q+ J* q j9 L( f
- * Home:http://www.phpos.org
3 U) o; q: B8 u9 c9 m% A- N - * Blog:http://hi.baidu.com/phps
: @7 j: ]" { B+ U) }0 V - *
$ @; }' k1 v g; ?; R& t - * 转载请保留作者信息 ( |6 t" W8 t# {
-
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- * @param 要截取的HTML $str
4 f. o) B- U6 `' z - * @param 截取的数量 $num $ C0 T$ E k& [8 T3 E7 ]( g. W* v
- * @param 是否需要加上更多 $more
0 V8 w- x' `% K/ B( V" ?6 A - * @return 截取串 * {1 d' o8 j- i. d
- */ & k* j& x7 Q' ~9 ? ~& R
- function phpos_chsubstr_ahtml($str,$num,$more=false) ( {2 L) T2 L' G3 h4 e
- {
6 ^0 W; s. c I1 z - $leng=strlen($str);
( h8 j1 F% O8 H3 k+ t- ^7 S - if($num>=$leng) return $str; 9 |9 P5 q4 s4 P1 g
- $word=0; ' h2 C/ Y$ U% S. g: _0 S
- $i=0; /** 字符串指针 **/
4 B' v- ]( T8 w$ X' B - $stag=array(array()); /** 存放开始HTML的标志 **/
8 f! y- g- N. Q: J m( x - $etag=array(array()); /** 存放结束HTML的标志 **/
+ a! M4 \7 ?* t; C( @/ J! E$ m - $sp = 0; ( _: ]/ e% l7 e) c0 _/ [
- $ep = 0; 7 F( c# A. M) ^
- while($word!=$num) * f& a$ Z6 E( F$ f8 e" S4 p
- {
+ U) H2 A, h2 g; x( @ - 2 o) L9 w5 r# O$ |6 d" J. ~
- if(ord($str[$i])>128)
; u/ I* Z& x. e4 h6 M! w3 C% ?3 R - {
2 A0 L- c Y# ]! X- R0 T - //$re.=substr($str,$i,3); 9 Z8 G' b* `9 r7 B' Q! Y
- $i+=3;
3 M6 g9 q! L) U8 J/ p: y/ W - $word++;
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- else if ($str[$i]=='<')
# u3 i+ |9 Y" i/ b9 Y9 V. | - {
* j' f2 y4 Q* ?5 Y7 c: S# l: [ - if ($str[$i+1] == '!') 1 y7 _+ V7 b- {. I1 ~, Q
- {
; q5 P2 l9 _) o. V& |0 t4 L - $i++;
, ^, O) q' d9 p. Q% o- Y1 s - continue; / x$ l) Q, }$ D' s
- }
9 O5 f* |: ^) S, A' ~5 z - ' q8 z/ R- B2 l
- if ($str[$i+1]=='/')
0 z2 J t# |" Y - {
; S o# `& D4 N1 s+ D - $ptag=$etag ;
4 k6 ]2 `5 X4 W% {) y - $k=$ep; # w" ~! l5 @5 i5 Q, _: v
- $i+=2;
9 T- {9 ]1 b0 k- { W' f - }
" P+ V" l/ [! s2 g - else * ^( O& I0 U( \0 {9 c& O
- {
5 `+ N+ C8 B8 u$ L; h - $ptag=$stag; : M3 l4 g6 _2 |2 U
- $i+=1;
& r Z8 c; w7 u4 \) @3 ? - $k=$sp; ) Y o( ~% E) j) L
- } 1 k5 d/ K' g2 s! R5 O
- 4 b7 L- Z/ V& ~4 m
- for(;$i<$leng;$i++) * O. I6 ~& q' _ B
- { 7 X* o5 C7 K4 I. H% W4 I
- if ($str[$i] == ' ') , Q& D/ I, s8 F4 F. ^0 B
- {
2 \ o% P' |+ E) b$ Z! q3 u6 J - $ptag[$k] = implode('',$ptag[$k]); # S3 y4 o/ ~1 V
- $k++;
0 t1 y7 m% W. m) a4 j; O - break;
: {0 Q& `; s- Q( Z& e; _" ? - }
$ [! E, f2 \( d" @ - if ($str[$i] != '>')
3 O5 g6 V3 h: W - {
' S& h5 p- r- F# r - $ptag[$k][]=$str[$i]; 5 H8 }. U! c2 @ G3 {+ d" l' ^+ Y
- continue;
$ j) _9 K T! H - }
( m$ ~/ E% @% h# s4 g% y - else
7 M; ^7 y/ A( Q7 }0 ~+ Y) c5 A - {
0 d7 ^/ `: x7 z9 k- |* q; P - $ptag[$k] = implode('',$ptag[$k]);
( S5 v, o9 f9 _( B - $k++; + _3 `; T; N, {& M# W8 q: n+ v8 v
- break; ' X. a4 p) l& B$ h% c# A, A+ Q
- }
$ N; S! N) ^4 Y( b. N; d - } 7 o5 I$ ~2 c2 C7 q6 i3 r* u8 D
- $i++;
, \2 t/ t( J2 s. m - continue; . t( `7 e+ U6 `; s+ S4 Y& D* C
- }
: p( A6 d; G( R( o - else 0 H) Y) N' ^7 T9 Z# e# i6 F
- {
. o2 W7 G7 S6 z Q( r# R - //$re.=substr($str,$i,1); 6 s7 a2 L# U( N
- $word++;
/ q# I" o' q+ W& c; P! Y- C - $i++; " P2 a8 E1 _7 q: @% @/ Z
- }
& e& S+ o' K K5 F" _8 j - }
0 ]6 k: S0 ?1 y5 A3 k) C - foreach ($etag as $val) 4 l1 R9 E1 D9 t7 x) O
- {
2 ~: b2 [3 I, P \ v5 |1 B9 \* @ - $key1=array_search($val,$stag);
9 L" f5 [+ o' I- e. i - if ($key1 !== false) unset($stag[$key]); ) O" I2 Z* _. N7 g3 V; n! [ m* a# j
- } : K5 j. L7 b6 K# {
- foreach ($stag as $key => $val) ( V! T( M+ t/ ^
- {
+ y" Y. |" t: g9 d7 } - if (in_array($val,array('br','img'))) unset($stag[$key1]); I8 i0 | w1 i# ^# j( Q
- }
6 h# E: T8 P4 B4 x, o - array_reverse($stag); 2 G) d. P/ y2 p1 v- u9 s) J
- $ends = '</'.implode('></',$stag).'>'; 2 `3 z$ L# @8 {8 F
- $re = substr($str,0,$i).$ends; , B$ q, r) F. I# m: g0 y; m
- if($more) $re.='...';
t( D4 \0 e0 L3 _2 Y& K - return $re;
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-
: {2 r4 v1 H( e, a2 H7 S' O - $str=<<<EOF , x- Q2 V% V: ]/ S( r, D
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> 6 i* h7 i/ Z, Q! ?% L( G
- <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p> ) }1 Z, I, \; V+ ?6 u, O
- <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p>
; N6 P9 G; G1 {2 `+ u9 p - <h3>What is Free Software?</h3> 9 \# p# j/ @0 A- f4 k
- <p>“<a href="http://www.gnu.org/philosophy/free-sw.html">Free software</a>” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.</p>
% s) X$ K! ^+ s8 c - <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> % y/ {# m4 P8 n; Q. G; f& c6 Y% \$ ^
- <ul>
5 x" z2 k- x! e. g! E* u - <li>The freedom to run the program, for any purpose (freedom 0). </li> / Z! d: G( B( [% z5 [
- <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 g- d4 a+ B) k9 d" y$ B$ M - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
. t2 H+ x" t: A3 T$ C+ ?# R - <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> 6 _* f7 _: R1 I5 F$ K3 M. u
- </ul>
, Q/ R5 }( `* B' n - <h3>What is the Free Software Foundation?</h3> 0 [5 i8 g) H+ h) \ a8 o
- <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> ! C8 B! w6 F) x. {
- <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>
. _" a" Q$ q0 s9 g/ U9 {' S - <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>
! h F! M0 a% w' K4 g7 n$ Z - <!--
/ Z- ]4 O; }" H7 c8 E3 J - Keep link lines at 72 characters or lynx will break them poorly # ~' L( a! |1 ~' [2 o
- Obviously, we list ONLY the most useful/important URLs here / e" k- y& ^! w% {3 `( S" |0 p, L/ J
- Keep it short and sweet: 3 lines and 2 columns is already enough % k( G5 N& p2 y: T
- --><!-- BEGIN GNUmenu --> Z$ P* P+ E$ v9 r8 [
- EOF; 0 G; i+ b" d$ l+ A
- echo phpos_chsubstr_ahtml($str,800);
- ~7 T- I- ^) T - ?>
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