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
* A4 \2 t- V1 ?; b/ T6 z - /** % G3 K) I* z* F/ z' g
- * 截取HTML字符串 允许忽略HTML标志不计
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- * Author:学无止境
( G: n: l4 i G# I5 H7 N! r - * Email:xjtdy888@163.com
" r K# u4 L5 K' n l - * QQ: 339534039 0 P! z+ @/ D2 l% f, W
- * Home:http://www.phpos.org % C/ w5 X( @9 W6 A* y8 m# p& F3 s
- * Blog:http://hi.baidu.com/phps
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0 q8 v, d* W* V7 @# ^1 o - * 转载请保留作者信息
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- * @param 要截取的HTML $str - x6 u- n, I+ M; M
- * @param 截取的数量 $num
- P* `- K8 ]' K. M; J - * @param 是否需要加上更多 $more ; D9 J6 t/ P- v+ H- Q V
- * @return 截取串 ) [) |3 `$ k7 r/ s( I5 L/ I
- */ 4 p+ F) c" @' e! X3 @( B* t
- function phpos_chsubstr_ahtml($str,$num,$more=false) - Y, L2 z8 F' h3 H- N
- { $ K5 _1 b# A8 S# B
- $leng=strlen($str);
% R3 ^% Y) x6 K) { - if($num>=$leng) return $str; # a% H1 T/ c. b2 I( l0 z9 c
- $word=0; $ g9 j# p9 H% `2 h; C
- $i=0; /** 字符串指针 **/
4 R+ F& `- M* P - $stag=array(array()); /** 存放开始HTML的标志 **/
7 h, }. x4 c5 y. o( f& M$ t: R/ B - $etag=array(array()); /** 存放结束HTML的标志 **/
1 m5 m% R- O% I - $sp = 0; & U$ `! G- `0 s4 I# _
- $ep = 0; 0 h/ {7 P( `% \1 L3 e
- while($word!=$num)
$ S$ ]0 i/ b0 z7 G; o- X - {
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0 `- Z. J3 ~6 e- K k7 a - if(ord($str[$i])>128)
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- //$re.=substr($str,$i,3);
& `0 J9 b6 B8 P3 q - $i+=3;
! n: }& t6 X# _* q - $word++; 3 p# X; q) O4 Y! K0 n
- }
1 T* Z. C# I! [* x) d' N @ - else if ($str[$i]=='<') * z4 }" {" V" U6 L- n/ a
- { 9 L) h+ H7 L# g: c2 p8 I
- if ($str[$i+1] == '!') ( i" l1 T. _! j, E
- {
9 B! I3 [" `# m+ V- n- L+ F9 b$ m - $i++; 7 |, }! h6 Q. @ `. G
- continue; 2 s+ C3 c0 |0 [* E9 J1 q" s
- }
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0 q9 Y. \2 `. [3 g6 { - if ($str[$i+1]=='/') 2 j- S% t; H5 |- l3 P. g+ G/ \. V" N
- {
+ ~3 s; y+ u+ \4 F! \6 N x7 g - $ptag=$etag ; 1 o; W2 _0 X3 `0 L) O# C
- $k=$ep;
( [$ ^5 }2 I# S) V6 C$ p" E - $i+=2;
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- else
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- $ptag=$stag;
5 z+ H: K0 s$ f" \8 z - $i+=1; 2 i, m! G" F( P5 n
- $k=$sp;
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- " J3 `3 |' V( ~
- for(;$i<$leng;$i++) 0 F! z& r; `% n5 b
- {
0 I+ P5 s8 t$ M2 `$ s+ F - if ($str[$i] == ' ')
3 n2 v, ?: ]* Z7 u2 K6 ] - {
" b2 q& A5 H' A) V4 R - $ptag[$k] = implode('',$ptag[$k]);
4 R4 {6 s% t, A9 \ - $k++; 6 L- @! r% s# {9 _! _' j
- break;
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- if ($str[$i] != '>') 2 P0 C n: F6 N+ g$ H7 \. E- ~
- {
( A% J3 U5 [% `1 v* ?+ | X - $ptag[$k][]=$str[$i]; ( Y9 i: u( t; U6 ^: p* K; W
- continue; : _% q9 `2 ]9 r! [/ I0 X
- }
3 g1 ]9 x! s% f3 p2 ~8 n/ I - else
" \& M/ w. o; B- q4 l - {
& B$ ~9 d7 D3 }: c" Q5 R6 { - $ptag[$k] = implode('',$ptag[$k]); ' ^0 g/ q3 R6 W! E. _0 X
- $k++;
! t! Z0 `+ f) `. Z) c# @3 j - break;
$ @( S5 _+ S0 h - }
! R1 Y/ Y% r4 L; g9 @1 u/ n3 U - }
4 {0 \; Y6 T, z - $i++;
4 S! ^( ^( b4 b5 s& {/ C# B3 _ - continue;
0 y" v) B5 V4 i - }
! J/ u) h/ |3 Q- W) |: i+ P/ o - else
6 w# v9 S C$ W: G, r- d - {
( a- `# S$ v6 R3 [2 w; K - //$re.=substr($str,$i,1);
7 q! N7 V+ ?: N - $word++; ! A: N5 U4 F# h, i7 J& Y ?
- $i++;
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- } 7 `) ]- R& s }, K
- foreach ($etag as $val)
2 Z1 Q0 J3 r+ |. M6 ~ - {
7 X0 ~+ [# H$ w' u+ K! ^ - $key1=array_search($val,$stag); & W$ u& ]* O# U' s0 W
- if ($key1 !== false) unset($stag[$key]);
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- foreach ($stag as $key => $val)
! t" T! O9 Y' g - {
0 E0 d5 E4 W' o- `3 t - if (in_array($val,array('br','img'))) unset($stag[$key1]);
2 a" \" [8 w, }, Q/ G+ b, q - }
9 Y: z% W; d) R+ H - array_reverse($stag); 3 H0 D) L# S* ?: E
- $ends = '</'.implode('></',$stag).'>';
* ^/ J; d! C3 ~ - $re = substr($str,0,$i).$ends;
& k4 r7 r( H" V+ C - if($more) $re.='...';
% x# {; C6 u6 k+ S& y - return $re; % I, J* _" p& J" Q
- } 3 t! {8 B7 D$ t0 U4 E* j
-
. r( Q' Q; ]+ ^; y! T( D - $str=<<<EOF
% ^& c g+ X- d# d5 v, @ - <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> / ]- R, H& L$ q' A0 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> 6 L* k( Y. Y3 [' S6 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>
7 H3 s; S1 b2 t$ h, _5 Q9 ~ - <h3>What is Free Software?</h3> % }3 h% a$ k- N+ I4 M0 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> / f2 m) J3 T! W0 A1 i
- <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 W$ e# \5 N9 N! ?2 H- \8 d
- <ul>
( ]3 I6 a; I7 m5 B/ l# D - <li>The freedom to run the program, for any purpose (freedom 0). </li>
4 M& v& v7 z" N& Y# x. N6 U - <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>
" k$ T" X" R, C: w8 X L - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li> * g: C1 ]5 |) S& t- v+ n5 b
- <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>
2 I* A: n5 v2 y( @ - </ul> ) N5 W$ A4 m0 @( `/ D
- <h3>What is the Free Software Foundation?</h3> 0 R" ?8 m' [6 \0 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>
5 C' M. g* M2 Y& 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>
) m2 E: f! A5 q) f: n - <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>
9 U' f& X0 ]$ z+ \& u - <!--
) h D, q5 u) Z: n* N, f - Keep link lines at 72 characters or lynx will break them poorly
0 L4 u p' W1 F* P c; K# ~/ p4 W: ~+ d- ^ - Obviously, we list ONLY the most useful/important URLs here + l# ]7 D8 Y: W
- Keep it short and sweet: 3 lines and 2 columns is already enough ' y5 ?6 ?: ^/ V2 X
- --><!-- BEGIN GNUmenu --> 8 p# N1 n$ m( ?9 Q& j1 p
- EOF;
5 F0 y5 {1 U4 M A: ` - echo phpos_chsubstr_ahtml($str,800);
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