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 C; D% ?' s, A/ A! ^4 t9 i: ~ - /** 7 J B0 [, z7 O `# H0 a& z9 m8 k
- * 截取HTML字符串 允许忽略HTML标志不计
9 M# J" o& c% Y1 b) J - *
& D5 W1 Z5 R) R - * Author:学无止境
8 H5 j* r5 V2 _. K1 { - * Email:xjtdy888@163.com
9 P6 U. a* ?4 g ~ ^& Y. `) b$ K& j - * QQ: 339534039 2 Y3 N. j* o N
- * Home:http://www.phpos.org
0 y. f, G$ N% o' U4 ]* w, o) z - * Blog:http://hi.baidu.com/phps , e( B6 w& q, {8 p# D
- *
& l" D" u5 B1 y$ q - * 转载请保留作者信息
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- *
: z! `0 ~; w% G1 u) L7 @) Q - * @param 要截取的HTML $str
1 g' w- q% k* d8 i: s5 S, K - * @param 截取的数量 $num ' t( [3 \; c2 }: `# O
- * @param 是否需要加上更多 $more
# @9 @$ A6 A' J- |; ?$ d - * @return 截取串 " C1 ~5 d: P- u0 E- E+ Z1 l6 X
- */
4 T: ?/ b+ Y% k- Y6 S - function phpos_chsubstr_ahtml($str,$num,$more=false)
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- $leng=strlen($str);
8 {/ w, I6 B# T! a, J. V# E - if($num>=$leng) return $str;
& K. p; S. c1 `8 F - $word=0;
9 b) R( p( b6 D# a# j - $i=0; /** 字符串指针 **/ ; J! g' S- L* w! [. p& X' N
- $stag=array(array()); /** 存放开始HTML的标志 **/ 9 @/ @8 i3 O) h" i# U; `9 X6 r* r! w
- $etag=array(array()); /** 存放结束HTML的标志 **/ / L. P$ k3 h* _# y6 N
- $sp = 0;
- z( ^; f( ]5 {9 v - $ep = 0;
( v/ R% S$ M/ I: X# r& Z - while($word!=$num)
& D7 @: W: O* W1 f- j8 f- n - { ) w! ~3 I" r0 Z. [
- " k' `$ P3 J3 N: F m- W1 h
- if(ord($str[$i])>128)
" `; {1 K% T- ? ]; N) o; ]2 H! J% L - { ' b4 Q) Z ]- @2 O
- //$re.=substr($str,$i,3);
( L( @: q ], ]) K) U+ c, ^- d) ] - $i+=3;
6 ?, X" [& S$ o v6 v - $word++;
1 _4 D1 W; u0 l. C* d T* {0 @ - }
' M. ^, U1 ?6 u' q* X: g# r - else if ($str[$i]=='<') 5 L( P, ~0 {. Q+ t0 O2 |
- { 2 b& ?& d. \& R$ C5 ^
- if ($str[$i+1] == '!')
0 }/ R" u" ~$ i - { * b8 R- v- A9 t G
- $i++;
& I& C$ y! _. @ - continue; 5 c8 \7 ~+ @7 B1 d
- }
! q% n5 Q6 g6 o, K+ Q9 F - 3 E$ E, e) h, y1 a, c
- if ($str[$i+1]=='/') # b9 T ~' Z8 E- V2 _8 X
- {
4 b6 Z; f7 ~" y3 o- X4 X - $ptag=$etag ; / ~+ `) |2 G: k( G. g! K) A* ]
- $k=$ep; , R, s4 e7 v7 l8 m* m) _* _5 c
- $i+=2;
& C2 f5 A* p9 w s' e3 K( c - }
9 y" a- a& K( s! _) B0 S' n - else : Y- O, c+ C1 z
- {
# ~8 n0 p; B' H# M3 Y" l$ a - $ptag=$stag;
1 }/ W8 ?& U* N, z - $i+=1; ( p; W2 i" f' d
- $k=$sp;
7 m' p9 c! f* c3 Q. U - }
" Z7 J) H+ C8 ?, l# Y. H -
1 |$ Q0 _ d' B" N6 Q - for(;$i<$leng;$i++) 5 }' q0 c _4 `" S: f, Q5 ~
- { 0 Q2 _( y% ^+ n+ s, k
- if ($str[$i] == ' ')
9 G, X% M' o0 @1 \/ C" m6 T - {
) [# K/ {% |) r$ O - $ptag[$k] = implode('',$ptag[$k]);
W' H/ u; L- p, b) M( M - $k++; 1 Q% n3 `) H# ?
- break; ( | i0 t. `2 G) b! Z: y4 J
- } + J1 @6 c; J1 @6 j
- if ($str[$i] != '>') 8 J( u0 z, E+ R% K
- {
) ~, y; `3 U3 F* t - $ptag[$k][]=$str[$i];
, D7 Z" C1 {% O8 Y. |. J - continue;
* y9 D4 Z7 O- g; u4 Q* M# [ - } 5 U' T" h) @" c2 }0 ]
- else 1 z5 u" p4 u( f) Q% B
- { / S' a+ f( u1 N3 V, m
- $ptag[$k] = implode('',$ptag[$k]); # l& [& k; [' S5 F
- $k++; * `2 {& B) m" I* f. s
- break; % p3 B) j/ ?; z. A7 ^: u: F4 O9 y
- }
+ `4 T8 L0 e9 j. z; L! e - }
* D( B# ^4 g0 ^1 n1 Q6 L, x) | - $i++; # x3 d/ O! x N
- continue; ' `+ U) \7 d4 u5 U$ Z$ \: f
- } # }0 f& G$ z4 B9 P
- else
; M+ v5 c5 ` C2 P8 Y/ Z - {
: z* ^ i" N$ ]3 N8 E - //$re.=substr($str,$i,1); 5 j% D3 g6 c) a$ ]* r6 }2 g
- $word++;
! j$ s2 V8 L. I - $i++; ( ^/ k& R' q) o3 @8 |
- } 5 C" v" I. D( v3 |- p
- } 2 n( k" L& ~# L
- foreach ($etag as $val) . m0 \) M7 g' n7 z' c/ D. n
- {
1 e5 W8 ]/ k5 q* v. O - $key1=array_search($val,$stag);
7 [/ V- x6 _' H `: j+ {4 y0 ? - if ($key1 !== false) unset($stag[$key]);
* |, _9 u' }! c+ U/ c0 ]) S - }
& E5 W" |! G" j+ C. c/ ?5 K - foreach ($stag as $key => $val)
) l# n+ O- a* k+ N - {
* _- B1 J) B( P- v @2 a, K: N - if (in_array($val,array('br','img'))) unset($stag[$key1]); % p/ s# q2 y& K3 V
- } 4 y* g0 L7 c; T- R7 C+ l( S# W
- array_reverse($stag); # X- Z& ~' v# ?2 i) Q* G; c
- $ends = '</'.implode('></',$stag).'>'; 7 }# u" n" Z2 |0 E8 c+ ~
- $re = substr($str,0,$i).$ends;
1 F( b) B, \ A7 E& n - if($more) $re.='...'; ( ?9 v4 W+ z: N: E
- return $re; 5 W6 `- c6 p) g( Y& b8 x+ O
- } ! t- U% W: x3 |2 d! \7 t! [
- 3 O: T/ J. {$ S6 y: t6 c0 ?
- $str=<<<EOF
' ^( }' H2 R0 z! w7 K - <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> % n* b# c. O! X) L' `3 b. x, z
- <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p>
6 z# J# M: Y. ` - <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p>
- w0 r3 r1 {# X. S3 p$ M - <h3>What is Free Software?</h3>
: ?2 ]( R' I( P( f( \$ `" e" w - <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> # ~4 S7 s9 j( [
- <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> * C7 V% f" K3 r+ w% P0 E1 \! z
- <ul>
1 q% v* h4 y" h6 m - <li>The freedom to run the program, for any purpose (freedom 0). </li>
' }6 I8 E- o/ c9 n8 n- }3 c - <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>
, A6 B. w6 j. v! i: W - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li> 8 z; M% d3 N$ g+ }6 a& u! a/ 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>
) q, F4 v3 o/ Z0 S6 ? - </ul>
1 e" U/ H4 T/ \$ H! n7 G& T0 F) L - <h3>What is the Free Software Foundation?</h3>
0 i6 B3 w& v+ @' H - <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>
3 `5 x7 h8 c+ x# l. i/ l3 I - <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 p* G( d( c' ]9 Q, K - <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> ! S, y$ y* Z; s2 x1 V( }& r$ ^, f4 j
- <!--
( L. b0 S7 T( @2 | - Keep link lines at 72 characters or lynx will break them poorly
; T7 U {9 Q& q# u* M: D - Obviously, we list ONLY the most useful/important URLs here , k* u0 s6 |5 k( O0 R
- Keep it short and sweet: 3 lines and 2 columns is already enough
- g4 S& V ^( @' U8 v* J! x v2 }) t - --><!-- BEGIN GNUmenu --> 3 W! I8 @* S# k1 {) z9 i' D
- EOF;
3 J- C1 H. I6 K/ i8 b; A - echo phpos_chsubstr_ahtml($str,800); 0 z% c6 H& C! H& t3 m9 z+ t
- ?>
2 C- r' k! ]- I" {
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