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 3 N$ k+ i$ F% q5 i4 s# U- H0 |7 s
- /** 6 [9 X% K% k [) w6 u6 x
- * 截取HTML字符串 允许忽略HTML标志不计 + `: _) s( P ~) W7 Z! |- s% w
- *
5 Z- M* |/ T6 r; j - * Author:学无止境
) e8 I0 ~# a$ U: ` - * Email:xjtdy888@163.com
; [1 w6 \% h( C - * QQ: 339534039
: \; |! h( r' f. p" Q. v# ]! l' c - * Home:http://www.phpos.org
5 ~' q( P& y7 g3 d: \, ~ - * Blog:http://hi.baidu.com/phps
; m# v' D6 D1 \2 {% u, n [ - *
" g! P! m, T/ g6 z( h - * 转载请保留作者信息 % C/ e) i4 y+ r7 ^& n, N' j' Y
-
" T! W& O, E7 ]8 m, p7 I8 X - *
! j( P* n% ^0 l$ e% ^ - * @param 要截取的HTML $str
0 S7 W: g; h$ P3 Q- D - * @param 截取的数量 $num 7 z) H' S2 S1 ]8 U! J6 @" F5 w
- * @param 是否需要加上更多 $more $ [( f6 N$ U; M2 p
- * @return 截取串
& y( y) o X7 e. x$ y8 c - */ ! F$ d0 c% P$ v v4 s' [
- function phpos_chsubstr_ahtml($str,$num,$more=false) 8 }4 \7 `( ]3 O0 B8 J
- { & ?5 T" S+ [0 |
- $leng=strlen($str);
( X p2 V& W q' b0 s - if($num>=$leng) return $str;
! V3 I. L6 J) E6 c - $word=0; & s. G4 C9 ^; v
- $i=0; /** 字符串指针 **/
# [6 y- E& J" g0 M - $stag=array(array()); /** 存放开始HTML的标志 **/ ' ^; s! E( @0 C6 o
- $etag=array(array()); /** 存放结束HTML的标志 **/ - W$ I' `& A# N
- $sp = 0;
9 F/ e; {$ }) x( o - $ep = 0; . L3 l% M4 R1 J* ]# @+ ]# p; g
- while($word!=$num) . G" g( D- V5 q7 ]( g
- {
/ ]7 n0 s4 g6 w1 n -
. u5 A. E. j. ~ - if(ord($str[$i])>128)
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- //$re.=substr($str,$i,3); , M$ z$ y/ {9 ^9 [' J
- $i+=3; 8 s, G+ \& M' o9 T, d7 K5 E% ~+ f
- $word++;
& a: w2 w) M1 ]+ x! G' }# O# W - }
4 F5 r: h2 |1 I% X }4 e - else if ($str[$i]=='<')
6 y, c/ c8 G- j - { % I+ M0 v# H- _2 w2 D. a/ z- a4 l9 p
- if ($str[$i+1] == '!')
$ g" v X5 X6 m - {
& N. P9 A' I# v1 K+ t- ^: a0 l4 n - $i++; 9 I' s4 N% k3 G( H3 M! N& D
- continue; / ^) i$ B0 N' [' o5 n! v9 M w2 {
- } 5 @" \2 [4 U" m5 F0 ?+ n
- ) K/ a7 ?) L2 i
- if ($str[$i+1]=='/')
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- $ptag=$etag ; , m/ z. ~" l$ T) H6 t- S! c. [8 o
- $k=$ep; 2 Z% o$ X; P" Y7 g
- $i+=2; 4 B% N" h, H- T
- } 2 m' M+ E H) z
- else % \" ?1 ~' e, s& x g
- { 0 J6 c5 B$ r4 h
- $ptag=$stag;
* l, h! q6 Y6 y7 R+ I$ W6 F6 a - $i+=1; % Q6 ~% {* A7 h+ Q1 L2 g" C5 _
- $k=$sp;
2 l+ Y8 Q7 H- K - } 8 D3 n2 T0 A6 g4 t
-
7 ]0 P% o' y1 N" q5 W3 t+ T. y - for(;$i<$leng;$i++)
' r0 i" p8 O: m - {
- ^* u2 s+ h+ z7 S. d( k - if ($str[$i] == ' ')
3 k2 `( \# [7 Y6 | - {
6 k+ O. U4 k0 G: P" T" r - $ptag[$k] = implode('',$ptag[$k]); " n7 X, f) S+ Q8 U1 i4 n
- $k++;
& }/ G r- I3 p - break; u8 p% G/ H: I, R/ j- T7 q* G3 o( P
- }
: t1 i: ?% ^. A) v4 ^8 X3 W - if ($str[$i] != '>') 4 H t) ?. ^ ?* g
- { 3 o! {* u+ H: n' N! @! |4 |
- $ptag[$k][]=$str[$i];
; a. s& [3 m4 b) ^0 W# G/ b4 P - continue; . Q7 z; y4 o8 f: E! i7 d- y
- }
( I9 o0 v7 h# D. |0 n. g1 x, S: y - else
. m3 p% W' n8 w' F' E: q* J; l - {
4 ]8 i+ ]- ]/ }3 p2 e' [9 W& Y - $ptag[$k] = implode('',$ptag[$k]);
$ V5 n! t" q9 U$ T - $k++;
7 E2 P7 t, e6 r) a2 w - break;
6 X1 W9 H# E) D) }( Y1 C - }
5 u& F# A$ f2 b5 T0 |% o$ M - }
, b7 r9 C2 o2 E: L3 E# h - $i++; $ F. g% I* k" S" J0 s& T
- continue;
# ^1 o T3 m1 e - }
9 O! m, V/ O' H8 i - else 3 q; o0 p. b* i& O
- { 7 z; N: E; U- ^) O" X
- //$re.=substr($str,$i,1);
8 B& }* j: u( [; h: I+ ?, o! a - $word++; - k5 p5 x K1 F( Y5 e! c3 B
- $i++; 2 L& \& t! c6 n9 [! ]" S
- } 4 k1 |5 A9 w' N! V* r$ i
- } ! h0 n3 f4 D- U" e
- foreach ($etag as $val) ) A8 N8 ~# ^; j
- { 3 d6 \: v+ S/ ]% `
- $key1=array_search($val,$stag); ! w0 g) N. t/ U: ~! u5 m, p
- if ($key1 !== false) unset($stag[$key]); ) F0 j$ l/ T0 D& ]
- } 0 d9 ?% {4 Q, h
- foreach ($stag as $key => $val) 7 }; Z) N3 s) \3 Q2 z) E
- { 2 m6 X2 ~8 i5 O$ c
- if (in_array($val,array('br','img'))) unset($stag[$key1]);
& Z3 g- G9 Y8 W- }7 M - } ! |: t) J# ^8 {2 X0 p! a
- array_reverse($stag);
( `1 N& n# G. }6 \2 X' W - $ends = '</'.implode('></',$stag).'>';
' F! f. X1 f3 e) @- ^* O, [' g - $re = substr($str,0,$i).$ends; : [9 a4 H3 t6 D+ h7 A6 `% o8 w
- if($more) $re.='...';
4 f; F* Q7 E* A$ b& K6 c - return $re;
$ a& c5 c2 g9 s7 A: H; q - }
( D: _ \8 F6 e2 s1 D- L, ~8 E -
0 ^. ^( L! k8 y2 o - $str=<<<EOF # K! d( M) k+ C7 ?
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> ( h p3 L9 g( H/ Q6 W. I
- <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p>
6 L9 ?! Y4 ? e9 {) D! M) D( [+ ]4 q! W1 @% D - <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p> " |8 q- |" {# c. y9 X- C
- <h3>What is Free Software?</h3>
, w. ? b. g: [8 |# N# ] - <p>“<a href="http://www.gnu.org/philosophy/free-sw.html">Free software</a>” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.</p> / H- p; b, h" `: s7 j4 w4 i
- <p>Free software is a matter of the users' freedom to run, copy, distribute, study, change and improve the software. More precisely, it refers to four kinds of freedom, for the users of the software:</p>
1 C G" J% n) {' h - <ul> 7 K% C: H5 k& M+ \# f
- <li>The freedom to run the program, for any purpose (freedom 0). </li> % z+ A4 H9 k! Y" [! a$ ` P- W* 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> 9 T5 r* o% a) c3 i0 }6 q7 B
- <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
- Y9 {- u. q/ P, M9 u0 V3 O8 v1 ] - <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> ( l1 Q. l! {, f8 ~+ R7 e* y/ I( K+ a
- </ul> + s6 U2 }( z$ J7 E7 |/ d: O
- <h3>What is the Free Software Foundation?</h3>
+ ?# ^; K+ P0 ^0 [ - <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>
& z4 W6 r* o# v9 H( o% @ - <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 j3 Y+ O( \* u/ I4 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>
- c" r3 r' R. r* x& A1 U& ] - <!--
( H: ?9 U- \4 I6 z: B2 k. _- j) ^ - Keep link lines at 72 characters or lynx will break them poorly ! l* t( T- v, j' v, B8 N" O
- Obviously, we list ONLY the most useful/important URLs here % X2 u0 n3 D1 o' s4 C2 O" \
- Keep it short and sweet: 3 lines and 2 columns is already enough
' k i7 H# Q! e* h" m7 l4 P - --><!-- BEGIN GNUmenu -->
3 \% D8 U H( U9 X/ ?! `) }9 d. L/ u - EOF;
7 ]! o. u. }1 z$ ]$ i - echo phpos_chsubstr_ahtml($str,800);
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