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
* b2 K% `) q( i; X" F. I* n# P - /** ) ~# E" [8 f; X0 M" [6 J
- * 截取HTML字符串 允许忽略HTML标志不计
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. h% f/ H7 d! I5 C( f& X& d R - * Author:学无止境
1 Y/ P: B8 v3 @; j( ^. d: ~ - * Email:xjtdy888@163.com * g, W4 O' E/ x
- * QQ: 339534039 ) ]! A0 r& ?, c3 q; X2 }6 G
- * Home:http://www.phpos.org
4 z, H8 g- m6 K7 _, b - * Blog:http://hi.baidu.com/phps
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- * 转载请保留作者信息 ; h6 D4 P( B0 t1 j% y5 K
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- *
' s" \; Z( R) q0 S( F% H, W - * @param 要截取的HTML $str / q! ?2 [# H0 R: G* [: w
- * @param 截取的数量 $num
6 o {) A+ H9 A% o. i" | b - * @param 是否需要加上更多 $more
2 }- U& T. L/ J - * @return 截取串
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- function phpos_chsubstr_ahtml($str,$num,$more=false)
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: E3 M$ n5 x1 j9 g M- u2 t - $leng=strlen($str);
! h9 n \# p! T% z0 b) e - if($num>=$leng) return $str;
; _$ U2 K$ A2 a8 b - $word=0; 0 g8 i- |) g4 b- T; u
- $i=0; /** 字符串指针 **/ 2 \, @, Z0 \9 Z' C
- $stag=array(array()); /** 存放开始HTML的标志 **/ 9 U$ s$ C- W% @! e; G5 w
- $etag=array(array()); /** 存放结束HTML的标志 **/ 6 L7 v" ` \$ E. `* b3 O, ?
- $sp = 0; 0 C+ I7 N! C m" O+ B; k+ I+ @3 j& I
- $ep = 0; 0 J5 {) D3 Y1 @% H
- while($word!=$num)
, y$ t/ P* N% L - {
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- if(ord($str[$i])>128) ( }: Q( j' |! c3 V. f2 r- R
- {
7 }+ P- x9 P6 u7 x1 f; u - //$re.=substr($str,$i,3);
! W+ c/ v8 T- F - $i+=3; $ d$ p6 d- M( e7 M/ Q; ?
- $word++; , H9 G# w# j: Z3 t3 G3 W) R
- } % D2 @# m4 c2 d& d o0 m
- else if ($str[$i]=='<') 8 X$ g4 N2 L) F4 Y& g
- {
$ e4 s* {. r( D6 x - if ($str[$i+1] == '!') & m$ g/ o, V; B, } z
- { 7 A0 T b1 G+ K2 j( p* [4 ?
- $i++;
& D! l6 E- F" h$ j6 V - continue;
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" R" [7 z; @& C$ Z5 O - if ($str[$i+1]=='/')
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- $ptag=$etag ; 6 h, i0 S7 K& `5 E1 A1 h) u
- $k=$ep;
( r. M, O* ?8 z* Y4 D3 [ - $i+=2; % M" p; t1 L8 }) Q) I
- }
_% k, Q! s" X; r8 p/ J' p6 m+ v - else $ ?" y2 i5 d; o
- {
9 ^4 T5 n6 t6 X) ?- R1 w - $ptag=$stag;
4 V7 s1 E1 S' R+ f+ } - $i+=1; . ^6 V2 |9 n) u4 i: m1 o- x
- $k=$sp;
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- for(;$i<$leng;$i++) 1 b: D( I) @- j @ |+ w
- {
4 T9 F" p8 A! @5 j - if ($str[$i] == ' ')
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; q& P Y4 ?/ h+ ~' { - $ptag[$k] = implode('',$ptag[$k]);
- M9 L- k- X9 v' l+ }0 A - $k++;
' P$ ~. v: y; p# R - break; - V1 N ~2 y/ }
- }
* \$ E3 `3 C# ^ - if ($str[$i] != '>') 7 T% y5 k" W) o8 b
- {
! i( ^* \' Z% e3 q* d - $ptag[$k][]=$str[$i];
# \) Z/ E {! t u! j2 M* ^ - continue; : m5 N, x. X4 r% v- w3 q2 U
- } - l5 u7 j( q" [, {) S5 \* Q
- else
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- $ptag[$k] = implode('',$ptag[$k]);
5 f5 z" i8 {7 O, [ - $k++;
5 @1 u5 `& s$ R% n1 n& u N' |; n! c - break; ! z8 x# r1 o- F
- }
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% e, p" A% w8 Q- r# y - $i++; 1 B& p/ ^" \, K& n9 R
- continue; i6 }+ B0 a: S+ d
- }
( _% N/ C) Y' ~$ K8 e5 r- _ X5 w! K - else
4 K: F6 j C( B8 B7 S `- r" B* `& K - {
9 F$ f" M( I% c8 S; D5 Z. h' e3 d - //$re.=substr($str,$i,1);
, a4 S( i' [# c! A6 W$ P& t' T% B - $word++;
9 U; U$ ]% J" b Z+ c% K# i# `& l0 z - $i++;
7 U5 ~5 I' s; ?4 F. | - }
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- foreach ($etag as $val)
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- $key1=array_search($val,$stag); 4 J1 E. V% ~) @ m* y
- if ($key1 !== false) unset($stag[$key]);
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- foreach ($stag as $key => $val)
, Y9 O7 A- ?1 A$ B% f: Z - {
2 O8 t9 }0 b* }( N: L, T* N - if (in_array($val,array('br','img'))) unset($stag[$key1]); * }( u) C( S5 S4 t3 d$ M
- }
0 o4 F0 W5 O2 D, z4 @ - array_reverse($stag);
5 q8 {; z v. r1 Q% y4 O9 f - $ends = '</'.implode('></',$stag).'>'; + @; d8 t% O0 L5 P% P0 P
- $re = substr($str,0,$i).$ends; 6 }% q: H/ H1 d6 N3 |
- if($more) $re.='...'; ) g6 ~4 z$ _; c! S m) A6 J' z
- return $re;
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+ ]- h- M9 l( L [! v - $str=<<<EOF
, [+ y6 i Q5 L" T7 e( ?) @ - <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3>
0 U4 \4 h3 F( h" H - <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p> 4 _ a- T% r7 Y
- <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p>
* i) g/ U: T9 R( Z1 u+ j7 ? - <h3>What is Free Software?</h3> p: _( ~7 O% L+ q6 t1 L, u9 E
- <p>“<a href="http://www.gnu.org/philosophy/free-sw.html">Free software</a>” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.</p>
2 O4 `+ m& n; q$ o P8 x' { - <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>
+ e: A3 K. t$ O9 ?7 E7 \5 s - <ul> ! y+ D- t' P7 `; M0 D
- <li>The freedom to run the program, for any purpose (freedom 0). </li>
6 d6 l9 m) H/ U; r - <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>
- f- R7 { s& w$ R* O- ?& A5 n7 D - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
% P* |: q9 [' l. o5 d - <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>
7 f" `" s( J4 V8 ` - </ul> 2 G/ o: M' Q7 _0 ~& I9 X
- <h3>What is the Free Software Foundation?</h3>
( \1 {4 `* o+ p. z$ q - <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>
, L9 }+ S6 T# _# R0 c* Z - <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 m1 d5 y: ^1 o - <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>
8 ~) q, H7 ^. `# Y2 S" s7 x - <!--
# x3 Q" y2 S$ A2 Y8 ~( P) ]& I - Keep link lines at 72 characters or lynx will break them poorly
' d2 m3 k* p$ b - Obviously, we list ONLY the most useful/important URLs here ! m4 j6 O! b% d; N9 v
- Keep it short and sweet: 3 lines and 2 columns is already enough , ]( c$ m( u% K* S- a
- --><!-- BEGIN GNUmenu -->
" B; S2 X% a0 ~9 x - EOF;
; q7 e2 {9 Y0 U/ o2 t: ? - echo phpos_chsubstr_ahtml($str,800);
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