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 ! y, {$ G' _5 v E+ L+ S
- /**
) `" F2 C: q% }# _& ? - * 截取HTML字符串 允许忽略HTML标志不计 , r% R5 {; I$ D$ j* Y) d' D
- * ! c& U; U4 L: `3 u6 H! x
- * Author:学无止境 0 e2 ~- @/ D5 T! d1 m3 m
- * Email:xjtdy888@163.com
1 J* n8 E' A' c - * QQ: 339534039
. ~% Z: Y& ]$ X, Z. S5 n - * Home:http://www.phpos.org . p# h2 |, j9 D0 G
- * Blog:http://hi.baidu.com/phps ; D a# v6 g1 a3 f' b4 [# X
- * & H2 ~: s# Z: L$ K
- * 转载请保留作者信息
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- *
/ O, t4 _0 ~" | - * @param 要截取的HTML $str
6 y2 K+ p1 }. z. C9 {- z - * @param 截取的数量 $num
* g, t3 Y7 O; F7 X( d6 i* o9 n - * @param 是否需要加上更多 $more ! o# E2 U! u" X' I/ \" t
- * @return 截取串
6 C! j2 F& F" K - */
' o, \$ R' n& M3 H. M o' X - function phpos_chsubstr_ahtml($str,$num,$more=false)
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- $leng=strlen($str); : ^3 m5 v5 S( M) q/ x. e6 M
- if($num>=$leng) return $str; / D7 L7 M- v+ ]; m0 @( f
- $word=0; ( m/ c" R* y% b) q( G( G
- $i=0; /** 字符串指针 **/
+ V+ l7 G) x5 A# B! x" S - $stag=array(array()); /** 存放开始HTML的标志 **/
& N0 f2 v2 C, ?* D3 X( y - $etag=array(array()); /** 存放结束HTML的标志 **/ / }# t, n6 J$ P6 o/ z: \/ R
- $sp = 0;
5 c4 E' h ?7 }) ^0 }( r {/ J* i6 C - $ep = 0; 0 l. L$ G `. y- Q: Y! Z
- while($word!=$num)
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- if(ord($str[$i])>128) ! q' i: h- S4 r" @2 K, C2 L
- {
/ `) B3 t) X( V# w# g - //$re.=substr($str,$i,3); 9 u! A1 g1 Q) I4 E: r
- $i+=3; 9 s2 I, O8 W7 X: l6 s3 z
- $word++; ( p9 c9 a2 g) b1 t+ q9 p& ?+ z
- } ' h* }* w2 s/ C7 D5 a
- else if ($str[$i]=='<')
- p {9 x' G5 L6 K7 O- B - { 8 e) V. m. S- r5 P7 V/ ~
- if ($str[$i+1] == '!') 0 W4 T& a6 _/ D2 T K1 a
- { ' X5 j: v8 S8 Y/ v" K
- $i++; " Z1 `9 d/ i7 H6 j( F: Y
- continue;
; F* D; l1 M! s5 N( C/ M3 a1 J7 U% n - }
: k8 v$ _# j9 U6 N9 [5 X - 7 `$ |+ n2 |* N8 Q/ Q N# a4 F' a
- if ($str[$i+1]=='/')
' i5 D" K: j, H# _+ b; S O2 q - {
: Y$ c) y1 K9 p. |& a - $ptag=$etag ;
( n- ?, w- I5 {( ^) P- A" J - $k=$ep;
3 Q* G J/ t9 R6 u6 | - $i+=2;
7 S: x9 S- C; n9 O4 D - } ( _9 ?( F) Z0 o; `6 d2 f
- else
) D7 q; t" j, A8 ] - {
5 {; _. S0 ^ N$ G, b6 c4 h0 K( b - $ptag=$stag;
, J# s: b; U9 b& _ - $i+=1; - ~( {. E1 p0 Q, u( k% C1 A, @3 M
- $k=$sp; $ e- O* Q& T' z( L+ U g' b
- }
- y5 C0 }; N# q7 T7 M( ]# b - : r9 s8 E$ }! A3 |' f' a* a
- for(;$i<$leng;$i++) : `* s X+ Q9 C( k5 K
- {
. J7 `, d( r: g3 ?- ` - if ($str[$i] == ' ') / I# i4 \# J5 i/ K! ?6 D" ]5 z
- { 1 h" R$ \/ p2 ^9 ? s! b
- $ptag[$k] = implode('',$ptag[$k]);
. k( D+ u0 _% d. \ - $k++;
0 a7 C9 Y0 N; |. g8 }/ i3 P - break; $ S7 A, }6 X8 h6 w! ?8 f# i
- } ) F6 I. U' U: t8 t0 ?* }& A. a7 x
- if ($str[$i] != '>') l7 M% D1 c% V
- {
, N' j( t" x( E8 W5 S6 F - $ptag[$k][]=$str[$i]; 6 A) d3 T3 Z1 A0 ^) C, f
- continue; 7 u* r) C+ D6 x
- } 9 G1 ?; Y( d" x, c( e- U# S: b: w
- else
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- $ptag[$k] = implode('',$ptag[$k]); 8 q. L. ]- C% f" u- H* T
- $k++; : |! x( o# A5 a) y9 F6 {
- break; % _ J5 z! a: {/ x1 J
- }
3 n7 F" x9 Y: I1 V! n% C3 Z - }
" O6 \6 g6 Z/ u. x9 ^2 {% r( T - $i++; ; ?) E% U) [8 i. Y0 u
- continue;
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2 c( F9 B5 K4 V( I2 b - else
) r9 q1 S2 }. m5 C - {
' r2 j; @. e( h - //$re.=substr($str,$i,1);
1 k" p4 @% g' N) z1 } - $word++; % t' c T6 k' w$ K! ]+ i( S
- $i++; ' g" c) w6 ]: K2 D
- }
6 B, b2 Z G6 H. G( U4 F3 M+ Z& D% { - }
, a: Z9 \) K. L0 B( ~' I - foreach ($etag as $val) ) i W z1 ^3 K; }: M( X1 c
- { ; {8 y& I& { q$ L) f
- $key1=array_search($val,$stag); 3 E3 ?, h+ ~# G0 ` x+ I/ E( E3 V' y/ Q
- if ($key1 !== false) unset($stag[$key]); $ I; D I* s- g W( a) l
- }
* f* } |6 M9 ?: Y! R/ W - foreach ($stag as $key => $val)
- C6 [$ A4 W, f - { 7 B* [$ Q. v6 R+ W* a% W8 p
- if (in_array($val,array('br','img'))) unset($stag[$key1]);
2 M* P7 {" D: [7 W% o) Q - }
1 Y7 g9 o% o4 B) V# `1 g0 S - array_reverse($stag);
0 `( ~6 R& ^. E2 ^$ ~ - $ends = '</'.implode('></',$stag).'>';
6 L1 D3 g( A1 Y7 i3 s' ] - $re = substr($str,0,$i).$ends; % I# q; [1 K4 M
- if($more) $re.='...'; + S' q# _0 I) g: G. n d$ O
- return $re; + l& f7 o J$ q- v
- } + F8 u1 V; j# F
- 3 L* Y) S/ G% n8 {, K4 k! k& l
- $str=<<<EOF 3 t. J3 K7 n7 ]. L
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> / Q5 |% `' b9 o
- <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p>
+ A6 O% O8 d, n; y- y+ l - <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p> # B% |" S, M+ `5 ~
- <h3>What is Free Software?</h3>
9 U/ X5 e7 {7 V) i' c* c1 l - <p>“<a href="http://www.gnu.org/philosophy/free-sw.html">Free software</a>” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.</p>
7 h' i4 d$ ^6 n( M, U7 _ - <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> 5 q& A: N( A: `) R
- <ul>
& c+ Z: ?7 [9 i7 z) m+ G6 M3 p - <li>The freedom to run the program, for any purpose (freedom 0). </li> 5 n! n! a! 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>
2 A1 Q0 M( t, S! ^4 ` - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li> ; R5 u7 `$ }1 P3 ^5 N6 D* i
- <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 F/ M. f" \; G& g1 L' t
- </ul> . x8 A3 v# @" c9 z6 B. f( k
- <h3>What is the Free Software Foundation?</h3>
- j, d4 f0 M; h0 v - <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>
7 e% X$ O' N6 W4 D H. F - <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>
1 [8 H7 y+ e" n8 k0 M. f" y - <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> . \- x6 N$ a' u
- <!--
+ a" E. m9 u# t. R% ^7 z8 B - Keep link lines at 72 characters or lynx will break them poorly & {( Z, }0 M( X( k6 X' p# Y. Z
- Obviously, we list ONLY the most useful/important URLs here
$ r) F% x) `6 c+ k% M( f0 N' c - Keep it short and sweet: 3 lines and 2 columns is already enough
+ \) n* D* X8 z, n- k - --><!-- BEGIN GNUmenu -->
( S1 A r* w2 W3 h6 p - EOF;
2 w5 w! ^9 D; w; s& _5 C# k - echo phpos_chsubstr_ahtml($str,800);
3 o' F* G0 f( L - ?>
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