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
! L }0 [ o" _; h: u5 b - /** # @ S$ W9 o9 D2 t
- * 截取HTML字符串 允许忽略HTML标志不计 ) c+ Y( H7 |2 X
- *
. h* \8 e* |1 D& n/ E - * Author:学无止境
( ^9 ~" g7 r$ d. w - * Email:xjtdy888@163.com
( V0 r6 w7 M! L4 L9 B! C8 W - * QQ: 339534039 4 t% x3 C5 N( t) V4 R( b
- * Home:http://www.phpos.org
, _: y% @$ P& g/ ]8 i; f$ u - * Blog:http://hi.baidu.com/phps ' W7 Z B( P: ^* K Y' U
- * ! X! Q% |4 ^ N! P
- * 转载请保留作者信息
5 o7 y' }+ m' d3 {$ K1 r -
/ z( _$ c( g6 f - *
, o; H- t1 \: |& ~& y) x - * @param 要截取的HTML $str ; `& c; z& d9 S( i& i+ B9 G" n; ^6 \
- * @param 截取的数量 $num
; I' _1 |! G+ b6 a2 [ - * @param 是否需要加上更多 $more $ G! w! B9 W& Y, z. K, o. X, \
- * @return 截取串
: I$ {" S: U& {& Y9 g3 N# h5 m8 L - */ & K! f# K5 C, h! [7 k; V b
- function phpos_chsubstr_ahtml($str,$num,$more=false) & J& q, p8 m' N8 S/ I
- { ~) [! F) B7 N8 |' _
- $leng=strlen($str); 9 P9 @# ^7 M- H/ P
- if($num>=$leng) return $str;
5 m, d7 h+ T8 O% O9 `: l& a - $word=0; ' l( b: Q- q |" [& ~& [' f
- $i=0; /** 字符串指针 **/
+ n" L8 z* y7 R/ `: |& } - $stag=array(array()); /** 存放开始HTML的标志 **/
+ H4 x/ Z$ X* c& L+ p% K* W) s# ~ - $etag=array(array()); /** 存放结束HTML的标志 **/ 4 j) P3 ~" M3 ~. ^6 z& w
- $sp = 0;
$ E$ P s( S# t* o( ~( m, ] y - $ep = 0; + X1 Z( u9 N) L
- while($word!=$num) , R; \) O5 H; U; c, P$ y
- {
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- if(ord($str[$i])>128)
2 o/ x" ?( v( `' M - { 5 K( J1 _, T, {, H
- //$re.=substr($str,$i,3);
+ C; u" k* a. y6 S! g# } - $i+=3;
. R+ Y" e H$ U# ?, z B8 C - $word++;
: @5 q9 s. s- O* s5 l4 r( [ - }
/ p; M7 ^3 h e/ m; f4 } - else if ($str[$i]=='<') 1 g! h8 X- m' N. G0 {" |& H+ m( `; i
- { . @' l# q' d/ E" v l; m4 I
- if ($str[$i+1] == '!') ! {* W5 g0 i" V f, T$ o" H
- { ) q3 ?- \; ]4 B& e6 G
- $i++; ' E' l4 T2 @% X2 E$ X3 d
- continue; 4 W0 W, i/ R% g3 N! ^
- } : p, n! d- g& c! l
-
, @& b A p8 a/ ~& e9 ^5 F. _ - if ($str[$i+1]=='/') $ y. n3 i. U: v! w: O
- { $ W4 u P' {( t5 |* Q- s
- $ptag=$etag ;
: s' ^6 L9 F) F0 Y( D( U, } - $k=$ep;
" N6 K0 r3 @! H0 W" x. z/ n& C - $i+=2;
5 @$ R9 V1 L0 e4 f - } . `# }8 z! R1 ~, k2 g8 z( E
- else / W) o+ K' l1 \" Z! v, _9 b
- {
! h2 B5 m* y5 O9 G$ V& l4 u: s# o - $ptag=$stag;
$ V- ]# [4 H7 l6 w$ l9 f! V - $i+=1; 7 @0 J1 X$ `) l2 }6 W
- $k=$sp; ) d( l4 h' I1 H: _2 h8 n
- } 6 Q9 \# ]: G' s7 G
- 0 C, x/ [- Q1 h
- for(;$i<$leng;$i++)
/ C' }) ?" K7 A5 B7 `" @7 T" K - {
4 L& z; p/ t& S4 F X @6 ? - if ($str[$i] == ' ') $ P' n0 j, C, q
- { & I/ A2 L5 |/ E1 v/ H
- $ptag[$k] = implode('',$ptag[$k]);
9 L% l4 d% d4 d. o4 V - $k++; + @! U0 k) v1 P; B; d2 F' [
- break;
2 `: V8 e7 O! Z$ R% Y - }
/ t( f- ~( u2 Q - if ($str[$i] != '>')
; Y3 f5 I+ K0 N9 Y - { 2 h; z: ` f& b* s/ L9 ?2 l2 j/ J
- $ptag[$k][]=$str[$i]; 5 T$ M. ?7 y* Q$ ?
- continue;
+ F! ]; | Y. ~: f) o$ D - }
0 h2 o% v _( `: C - else 2 u% M: {* H& a: U7 D/ Q
- { $ k4 ~/ m5 Y! G- [' |8 E% c
- $ptag[$k] = implode('',$ptag[$k]); ; `1 Z. [( r" p2 A+ S# j
- $k++; ! |/ R5 \' i3 o9 s- R8 k5 V: |
- break; 5 n) T$ V6 G& y6 S) ]
- } : g3 ?# c9 s9 H, ]) q
- }
1 q, D9 U$ o/ K: [ - $i++;
+ ]' l) d+ T7 d/ ^: J9 b; ^& v8 `3 ^ - continue; / y/ E0 [9 c$ g! Z# ?8 ~
- } 3 L6 t* N) U& _8 W x
- else
7 {/ h) P$ w8 k# Z( r |# F/ E- z. d3 u - { ! L) f' r! T& [
- //$re.=substr($str,$i,1); & \& R% C$ F! z# V o
- $word++; 4 X: {: H# a( W* Z/ i
- $i++;
' f& ^( M9 w0 f$ b5 |) h Z4 i4 M - }
% J) S5 A# e, l4 R3 O" f! A. v - }
* a( E6 h) r" w \7 D - foreach ($etag as $val)
/ u! U" o% k/ w) j - {
4 y5 y+ X7 t, l; f, T ~0 f0 f - $key1=array_search($val,$stag);
9 p. S/ H! c! r- X- r - if ($key1 !== false) unset($stag[$key]);
3 D# U9 O0 R# w7 \* a: |/ u1 @9 U% C - } $ a2 ^& X l, }! O; B$ a6 J. ]
- foreach ($stag as $key => $val) 1 n, Y* a4 e7 M& H- h6 u( H
- { / c# O7 ?# E7 {
- if (in_array($val,array('br','img'))) unset($stag[$key1]);
7 [ U0 K. O y9 v' K" r - }
+ h2 B6 D: L$ ^$ z - array_reverse($stag); + g# @5 O8 \! m- A8 x8 U% i% B
- $ends = '</'.implode('></',$stag).'>'; 8 J4 f6 g, `% S
- $re = substr($str,0,$i).$ends;
0 [, Q/ z$ N' N, H- ~$ j - if($more) $re.='...'; 3 `3 U3 W/ s% n0 ~
- return $re; ^, [, }. x1 D9 @% t+ M3 ?: r
- } 3 F' b! x B Z; h) u/ J8 t0 `
- ( j, }9 J. g3 m$ h; S$ |' R
- $str=<<<EOF / x$ F8 t! U% B% w7 V8 b
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3>
4 T* U3 q% g; `! Q( Z- M' S! x - <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>
( N1 W( e; i ~4 S, s( { - <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> : T7 ^( `0 Z# B) ?. i
- <h3>What is Free Software?</h3> ) j3 L0 R+ W0 Q) E% U
- <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> 9 B" }0 g, h& u* N
- <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>
- A; f; t9 k. l8 S4 h2 s* q - <ul> ( Y$ x- i) Y2 m0 U
- <li>The freedom to run the program, for any purpose (freedom 0). </li> % B1 V8 a; D3 [% o9 i' }
- <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>
+ u, _0 q. b0 A1 [" ` - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
( T% e1 g1 i" C& h - <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>
1 |' }# Z: x+ j5 b - </ul>
1 B, N& P9 O5 ?$ H - <h3>What is the Free Software Foundation?</h3> 3 K4 [3 z" R/ k0 ?
- <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> 0 i0 q; F, g2 n' o) G6 i+ M V
- <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>
3 O' x; A$ C+ e - <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>
1 z3 j; Q4 E! ~4 x; S - <!-- " ]6 I9 s6 {' o) e5 s0 H# ]
- Keep link lines at 72 characters or lynx will break them poorly
; A( C7 K+ ]- `9 M* X! i7 r: K4 [7 P - Obviously, we list ONLY the most useful/important URLs here 2 r% d5 \$ s7 ]- d# Q
- Keep it short and sweet: 3 lines and 2 columns is already enough
" j' C- T* J1 H' A - --><!-- BEGIN GNUmenu --> " O0 j6 ?, P- n* G) [% o
- EOF;
2 p$ {. ?+ H7 `2 { - echo phpos_chsubstr_ahtml($str,800);
! H! s; t4 x+ U4 x - ?>
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