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 F$ Z) ]( X0 L: L" I5 E* J. w
- /**
. \ _& {- \) N - * 截取HTML字符串 允许忽略HTML标志不计 ( z! d% Q( W5 W
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- * Author:学无止境 . q: A' Z( D0 ]0 I; c* s
- * Email:xjtdy888@163.com
$ Y7 R. O& N9 G( Q2 f7 D9 O7 t - * QQ: 339534039
5 J; b# O, `* X0 M+ ~! x - * Home:http://www.phpos.org ; V7 \; H% j9 ]- w) N/ B5 s
- * Blog:http://hi.baidu.com/phps
# y+ y- x3 x9 ?8 N5 M5 E - * 2 v: b" \. G+ n- Y9 b- E
- * 转载请保留作者信息
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- * @param 要截取的HTML $str
) K6 w; \7 t' B2 F* u( t0 b - * @param 截取的数量 $num ( t) \9 T7 S! q$ _ d
- * @param 是否需要加上更多 $more
# x" N+ \- n8 H4 e( h0 S - * @return 截取串 / H; _ p8 g; @
- */ 8 { l5 y$ T4 @& r0 N, Q6 N0 d
- function phpos_chsubstr_ahtml($str,$num,$more=false) 1 ^* K9 u$ |* Y; Z* D7 D$ h
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- $leng=strlen($str);
7 H3 F: l9 E( b4 z% [7 p - if($num>=$leng) return $str; 3 P4 `7 [1 a! ~1 v$ n
- $word=0;
4 k% \! C5 w; L8 ?, f - $i=0; /** 字符串指针 **/
4 W$ M/ f5 n. F3 G6 E! ` - $stag=array(array()); /** 存放开始HTML的标志 **/
# d3 h y! [5 \) C* j - $etag=array(array()); /** 存放结束HTML的标志 **/
3 q! H1 Y2 j& Y2 o3 }9 q7 l# t - $sp = 0; 6 F8 U% i( T+ X% V
- $ep = 0; , f8 u, g; ~1 K7 u
- while($word!=$num) $ g7 R7 x( B3 p2 i
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-
8 H0 q- T A; N8 a/ o$ |) R - if(ord($str[$i])>128) 0 x4 w# W) _) d7 i$ S2 _, Y
- {
0 D4 m7 q2 b+ O" f/ Y! U9 V( a - //$re.=substr($str,$i,3);
0 j e) y5 W, H - $i+=3;
6 l: X+ j/ c. |2 Y2 [ - $word++; 3 V7 w* }' Q3 b3 G6 S
- }
- d- P H o' v- y' j - else if ($str[$i]=='<')
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- if ($str[$i+1] == '!')
; E" y7 ^1 w* J8 m - {
$ S9 D5 l# W# Z8 x - $i++; 9 g0 Y" o- `; F; V
- continue; ?1 \: F+ |3 T6 L0 r
- }
) @' T8 O% g" G -
( x' v) X& j3 B) d+ z - if ($str[$i+1]=='/')
' e d/ b8 p) ?" C, | - {
$ E( _/ t6 ~7 g3 }, `; h3 y - $ptag=$etag ; ! o! z7 q3 q% J4 C: O O" G
- $k=$ep;
6 S+ g8 P1 h/ j( d$ B0 ~- `. w - $i+=2; 4 D& Q. D3 A" Z9 R4 f" G* S* G. A1 Z
- }
/ J# Y4 G4 c) P. h - else
5 d7 L3 [1 Y) |' t7 N" _8 V5 |2 c - {
6 J8 H Q* `# K2 Y! | - $ptag=$stag;
" A0 Z: C$ Q' `. B7 D - $i+=1;
" ]6 w% y7 {; H' C% E+ y4 H1 B - $k=$sp; ) T) E$ H$ e% H$ W, o' ]
- }
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2 G, J1 F- _) Z. e' ^ - for(;$i<$leng;$i++) 1 h! k( }$ g1 U$ K2 @6 o; j$ u+ R
- { {: x% O. V8 k
- if ($str[$i] == ' ')
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- $ptag[$k] = implode('',$ptag[$k]); " w; C2 _. u E; v; @
- $k++; 2 _# o+ x- ^0 W- I
- break; / y) e% S# c4 {5 m" ]
- }
/ Z" h" w) c% A7 x - if ($str[$i] != '>')
1 g+ Y' \2 t& u( C - {
) |( S' d; E3 V6 v5 v# H0 W1 N. n - $ptag[$k][]=$str[$i];
$ s7 ^- a/ ]' M1 y - continue;
2 N8 C! n0 D( s7 E - }
( H; G, W W( b: j - else - N' h" h6 C( s
- { 3 G$ S9 ^8 t' f' W% J V
- $ptag[$k] = implode('',$ptag[$k]);
3 v2 b% a& D2 ]5 I1 A - $k++; . B* A( S6 G+ a& Y3 s% I/ C% o8 J O
- break;
1 `+ P) k% [; z% X4 k: Q - } / @ {: A9 N3 P, F6 ?0 `3 x0 _
- }
) a# K# {4 M% A! \/ g - $i++; ! @ Y) N6 x% N" Q/ H; L7 Y2 v
- continue;
; }2 A% `9 c. }" u4 L" [" ~9 p" ? - }
3 f6 I- t; w1 I' F6 l. U4 M3 [* h - else . ^- K" {* D u$ @8 O
- {
; k# j0 S6 m" C+ `9 ]0 b/ P) p- M - //$re.=substr($str,$i,1);
' ^' `! h( e: F - $word++;
& q: r. N8 t: K, Z8 A$ J8 X R - $i++;
) z, n( ?. F% X6 [ v8 B - }
' {" {4 P! F6 G! z0 V - } 3 P1 ?, m$ F9 w! O/ Q5 J( ^9 m
- foreach ($etag as $val)
# R& E% q9 e8 P2 P1 b7 Z7 A( I: ? - {
; y% p: N; t' l! l5 r7 L" E7 M5 e - $key1=array_search($val,$stag);
# o4 c7 \) Z8 w6 `6 D, ? - if ($key1 !== false) unset($stag[$key]);
3 r4 Z; u4 u% k! U7 `* f - } 7 o* D' z+ l$ V& V H0 g. I
- foreach ($stag as $key => $val) 8 n7 J' D2 N9 h
- { # f; M/ P) \- \7 ?( T) V
- if (in_array($val,array('br','img'))) unset($stag[$key1]);
( J4 f/ t; i9 W$ f7 n% L - }
! a0 o- g: e6 w/ P2 m - array_reverse($stag); 3 z X }- q: i
- $ends = '</'.implode('></',$stag).'>'; # @0 N( E' V: r L& P) {- M
- $re = substr($str,0,$i).$ends;
) L/ p$ @4 ~2 k& U+ ~5 [* ^ - if($more) $re.='...';
* W- _4 X& ^: L6 u6 a$ s% }' f - return $re; 7 r3 [7 W! A" e# k6 f7 P1 q. H
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- ! V3 \5 D2 C0 ~# b& {* j
- $str=<<<EOF 3 G- Z% Y0 q: Y: D$ W$ L
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3>
5 l, ^ z) u$ D& w, Q2 ^( _& Y - <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>
" ~$ P) _! g. R- e. v+ K, 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>
5 i2 J3 r# [, n: w, O3 y' m - <h3>What is Free Software?</h3> 2 N# w8 y9 i/ p+ V
- <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>
/ k& D2 F$ ~4 _ - <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>
3 B4 k2 V" _9 w3 \; R - <ul> + G5 A3 n0 [( G$ ?$ ?" t& O! [
- <li>The freedom to run the program, for any purpose (freedom 0). </li>
+ {3 B6 W, d- z% G A G5 s1 p - <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>
! q) X5 R6 m" a' X6 K( a- V - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
; F+ B8 E, h# Q: _ - <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>
" b9 w# s( p$ h# p2 h. y* Z - </ul>
# _: x: z8 Q8 H7 k - <h3>What is the Free Software Foundation?</h3> / @9 U4 l( \& w
- <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>
; B) ~3 m, o# l - <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>
; r, ^9 s& { Q1 N$ e3 y' Q - <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>
i2 |2 l8 J7 N - <!--
6 \2 y% s7 C, f$ e - Keep link lines at 72 characters or lynx will break them poorly 1 b7 A, ]$ C5 _5 r9 K) w
- Obviously, we list ONLY the most useful/important URLs here - R# I% \+ ?- @- `5 M6 B) q
- Keep it short and sweet: 3 lines and 2 columns is already enough
$ ^; F1 u L. W' E - --><!-- BEGIN GNUmenu -->
$ c, D! F9 Y$ F+ M - EOF; : n& C" `3 t' c% I0 `' ~; s
- echo phpos_chsubstr_ahtml($str,800); & J( {) B8 `) u) S5 D& Q! ?0 }) U# a0 u
- ?> $ R, u) P, L5 V; h) \* F
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