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
/ D! e- M8 D7 s* U - /**
4 `& v% n6 k/ u; P( w7 }7 t - * 截取HTML字符串 允许忽略HTML标志不计 + Y4 v2 @6 [4 X) T2 ` P4 v- H) X
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- * Author:学无止境 5 ^+ ?2 V' D; ?5 `, S# M: |1 ~9 @
- * Email:xjtdy888@163.com
, q! v0 L2 r1 L2 y - * QQ: 339534039
% U' q2 i: [' M5 I - * Home:http://www.phpos.org 6 b5 `$ ~; _: I3 p9 O1 @/ t d
- * Blog:http://hi.baidu.com/phps
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- * 转载请保留作者信息
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- * @param 要截取的HTML $str 2 v9 |! I1 N* X( Q f8 m9 y
- * @param 截取的数量 $num
" N; E* v/ O% |' N - * @param 是否需要加上更多 $more 9 t5 [( ]2 U8 m N5 C! I
- * @return 截取串
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- function phpos_chsubstr_ahtml($str,$num,$more=false) 5 R+ x5 ]! T; B# Q* B, [4 F
- { 8 d; \8 n4 p) {+ ~7 S- \/ M- c; ~+ z
- $leng=strlen($str);
0 x! d& c6 W3 g0 W) T0 S - if($num>=$leng) return $str;
5 J6 n. U9 v1 u' J6 e - $word=0; " c8 d' J$ @ s7 [5 x+ l3 Q
- $i=0; /** 字符串指针 **/ 8 q. h5 X4 l- E8 U
- $stag=array(array()); /** 存放开始HTML的标志 **/
& S- b z& G3 y6 k* I- ~# l$ n- D - $etag=array(array()); /** 存放结束HTML的标志 **/ 5 d* y: t/ a/ q3 ?7 H7 r
- $sp = 0;
3 S( O8 t, o6 t5 | - $ep = 0; : \2 i1 w. N1 D8 | G
- while($word!=$num)
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- 0 u' M9 n, x; i3 U& H+ W7 @! q
- if(ord($str[$i])>128)
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9 ~7 K9 C' m0 D$ v - //$re.=substr($str,$i,3); % }8 O& K6 W' o" ?
- $i+=3; % O& R& C" B$ F) p) n; _% l8 d9 T
- $word++; 0 i; j0 ^$ m4 ?) F) u4 Z
- }
$ ~; w+ o9 X& x$ x$ u" R$ U' m - else if ($str[$i]=='<')
? b5 G6 o; {$ b* U% @+ T* L - {
: C; s: i0 r3 f1 C1 F* I, W - if ($str[$i+1] == '!')
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- $i++; 7 q% c6 K1 o; c
- continue; / T( Y) R2 k+ M; k" h0 r
- } + }5 m4 I8 S- y X3 E- K
- 7 R% H0 }. \( k: |* w0 u6 `# o
- if ($str[$i+1]=='/') 4 a* M1 d' M9 R: A' R
- { + v. T9 M. o4 ]/ p5 T
- $ptag=$etag ; ]' [1 e8 n$ T- }" u" ?; {
- $k=$ep;
8 U5 q6 `, `" m% U& l7 r0 c - $i+=2;
3 j- L$ l3 V, \ h; C# b - }
8 J) Q& S1 m3 _0 c; G - else
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) f' i9 ?% t+ q9 o' {+ _5 u - $ptag=$stag;
N6 @' \" o1 q7 b6 v" a - $i+=1;
$ f! E: s5 B D! D8 O( t - $k=$sp;
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-
9 P* O) e$ d- ]& F% N* x9 C# ^ - for(;$i<$leng;$i++) 8 a5 l9 U f4 q- P& |$ r7 G" N
- {
& A) R0 C5 m0 K, S# g! H7 _. K8 M - if ($str[$i] == ' ')
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- $ptag[$k] = implode('',$ptag[$k]);
( O1 l, W6 {+ P$ Q5 F. [% V4 p* \ - $k++; + W$ _$ o% R n2 G. H
- break;
" }* ]- D$ j/ u7 E# V9 I - }
8 l5 `) }2 q+ z# R- ~$ p7 T/ J - if ($str[$i] != '>')
/ S! R7 H: Q; v6 J% }" l - {
1 ?% w9 C0 l7 y0 [ - $ptag[$k][]=$str[$i];
$ T. Y5 g/ b2 z: r% g' S- p - continue; " Q+ U. Z2 Y) o
- }
8 v$ b4 S7 m- ~+ s, L5 W1 v) \) `2 C - else
5 ]) j1 y/ B8 c7 e. t, K - {
- @! t" V) f% [ - $ptag[$k] = implode('',$ptag[$k]);
0 F& C) l+ `1 x5 @, `( Y( r" \+ N - $k++;
3 q+ ]/ a- V7 r( ?5 |* s& K7 i - break; * p% X! u4 G1 w
- } ; K- \% V2 K3 c# _
- } & m2 X, U& h: ?. I5 k
- $i++; - Q# B8 @2 I# \1 s, B
- continue;
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- else % D( W. |, P. q% [& b0 ?9 x
- {
3 g; E8 z3 F& `5 H+ z - //$re.=substr($str,$i,1);
3 T* h2 u, w; Y; ^# \& b - $word++; 7 m4 {0 V. @ J) q9 i7 ?
- $i++;
: N4 _4 m2 g1 M - }
6 I6 t/ S: e. V9 Y) q6 x' M - }
1 ? W* w7 X4 ^3 ^% L* j, ~ - foreach ($etag as $val)
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- $key1=array_search($val,$stag); # y- y, S) D# j" ]0 O
- if ($key1 !== false) unset($stag[$key]); 7 {& t, o% L% B: D4 J
- } . ^$ D8 z8 N9 X
- foreach ($stag as $key => $val) ) Z+ r( R1 |6 |" ]- I W
- {
4 K7 S m3 a1 F6 ]* } Z7 e - if (in_array($val,array('br','img'))) unset($stag[$key1]); " q) V- k! T7 @1 {1 F7 I) u
- }
! Z* s$ p) m3 b8 c+ Z - array_reverse($stag); . t6 Q. z6 k+ \7 [3 }
- $ends = '</'.implode('></',$stag).'>'; 2 s( y7 n" K* E G2 ?. O
- $re = substr($str,0,$i).$ends; 0 b# o u/ a5 w" [8 N/ }
- if($more) $re.='...'; 4 Z2 s% R3 S ]+ a. h+ Q8 w
- return $re;
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4 W! i4 h- S! x8 a - $str=<<<EOF
8 n7 s5 ?: I2 S2 g% _3 ] m - <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3>
# l) f: w$ A5 e: G. Z1 ~ - <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> ( W1 Q; v+ u' F: V# z6 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> / [" g' V$ I7 p- v3 O4 Q' z- z
- <h3>What is Free Software?</h3> 1 ^( Q6 L' }& M' g, v+ i1 P `
- <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> 1 U3 H- ~5 W! ?' m* A2 ~! 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>
4 Q7 }: o8 P+ p" k8 D8 r2 `* s: W$ U - <ul> $ S- g2 y T2 r
- <li>The freedom to run the program, for any purpose (freedom 0). </li>
! S' c; A0 {5 W) b" s( \ - <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>
8 p, g7 s" j9 ]6 A5 H" K* i - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li> 3 s R, a U/ U, P$ E3 |
- <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> ' c# U8 m8 d1 C2 E
- </ul>
! Z/ A2 N/ K/ d7 Q - <h3>What is the Free Software Foundation?</h3> 1 _! ?2 t/ J: [4 w$ U+ Y
- <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> 0 r3 B+ ?% G. X$ u- N2 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> 3 A5 U7 c7 U& e# j \1 p) s
- <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>
0 u# ^9 Z# Q" i+ s1 P; }& K2 A6 }- { - <!-- ' c! P/ S4 }. M( B" }6 {
- Keep link lines at 72 characters or lynx will break them poorly 3 q2 N0 w( `% [3 ?5 ]3 t% o
- Obviously, we list ONLY the most useful/important URLs here
+ B9 I& a! ]# W% v* t B; q5 y - Keep it short and sweet: 3 lines and 2 columns is already enough 2 N* Z7 l" Y" [6 Y
- --><!-- BEGIN GNUmenu -->
/ [ q. F1 ~" Z$ E - EOF;
4 f" m# U4 X5 z( J4 K( h - echo phpos_chsubstr_ahtml($str,800); + X5 [$ k5 c2 U) [" `( y) _0 k3 p8 f
- ?>
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