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 6 y$ f0 p5 ?4 |, k" L
- /** * e# m; l# R7 O/ u/ b
- * 截取HTML字符串 允许忽略HTML标志不计
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- * Author:学无止境 ) A* v- B# N. X5 N; g, G
- * Email:xjtdy888@163.com
$ j) v n3 \: r" n( h9 S - * QQ: 339534039 5 ^- J5 S8 B+ U! U
- * Home:http://www.phpos.org
3 A# |4 J) i4 h2 X% ` - * Blog:http://hi.baidu.com/phps 4 ]* Q k) T) I& q a7 c7 t
- *
' J" j' D c/ { - * 转载请保留作者信息 + R D4 T6 T- o! X. N! j+ V& [4 `" ?
- ( r! p+ m. ~9 v9 @1 R) Q. v$ @
- * + ?! u) D7 Q3 _1 m
- * @param 要截取的HTML $str
6 b4 ^: U/ w' P* ` - * @param 截取的数量 $num 2 G3 D% C7 D: U
- * @param 是否需要加上更多 $more
* @2 T7 z; A7 \ - * @return 截取串
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- function phpos_chsubstr_ahtml($str,$num,$more=false)
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- $leng=strlen($str); * P; W* R" \7 p4 E" t
- if($num>=$leng) return $str;
$ T, h7 z( Z0 ~7 g8 L - $word=0; 9 a& V9 k. U4 |# @6 `6 N; I' C0 g
- $i=0; /** 字符串指针 **/
( l9 m% ^. N& q: P& f7 W& a* B - $stag=array(array()); /** 存放开始HTML的标志 **/
5 L+ A: K) H$ c) @7 c - $etag=array(array()); /** 存放结束HTML的标志 **/ 1 z# a. P' H& g6 V# t6 S8 c
- $sp = 0;
0 T/ b. J5 T3 X5 g3 L; a - $ep = 0;
, o) [% q% u z& [) Q1 G - while($word!=$num)
- S7 b8 ]! x% f. y5 O! C$ d - {
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- if(ord($str[$i])>128)
9 Q4 w6 j2 I. P8 _/ z9 U* ]: } - {
' L9 B. [9 L4 ]4 C. Q! y - //$re.=substr($str,$i,3); i: P0 G3 c+ i9 L$ j4 q; ?4 j
- $i+=3;
1 y8 I, {7 s7 R4 w; K1 q) d9 b- c - $word++; $ D4 S0 K9 X9 V
- }
3 a& o: r- o% T- I: P1 c - else if ($str[$i]=='<') ; ]+ g) V0 _6 y& h9 [
- {
2 ^# q2 x) x, I6 L( [ - if ($str[$i+1] == '!') 9 D# n5 t) l* R. N* y
- {
; p. ]/ O' j' {& f - $i++;
( g, C6 @5 C: ^3 K - continue;
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-
0 N1 U2 g# z/ Y1 K& k( L - if ($str[$i+1]=='/')
9 C5 f" ?, e. p# ~8 q - {
" H3 c0 B$ ]. g3 @# `* N; c& l4 ` - $ptag=$etag ;
$ U8 W5 I+ h6 h, D - $k=$ep; l# S, J- L% i& N6 R
- $i+=2;
- F) {0 n( |; b. Q - }
. Q9 g0 `: r6 o& ` - else 6 ^( {4 ?1 t+ x# l2 m
- {
0 R& @9 v1 ]+ X" J" [5 E - $ptag=$stag;
4 u o! g. R2 ?1 ~6 _( p - $i+=1; / k+ R( h# p" R& ?( }0 v
- $k=$sp; 0 E. i( x( l. ]* K
- }
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- for(;$i<$leng;$i++) 0 Z: M3 p: V% f& O. t
- {
/ a$ h- ^* d. m: m+ J2 v - if ($str[$i] == ' ')
3 z, n4 u+ p. i/ e) b% F6 }5 k - {
# _/ n* x0 j. j& \0 `$ g3 ~ - $ptag[$k] = implode('',$ptag[$k]);
& O8 {1 u8 p; L+ g - $k++; * N' C" a+ R' N) R1 ~: @
- break; - o6 V$ u; C9 ?8 o- e' [
- } : q3 x' r# s) Q; q0 {* E
- if ($str[$i] != '>')
" [ Z5 v; ?1 _; J6 b% ~" F9 F - {
* C: G' j! X6 U/ v" p6 J1 l5 p - $ptag[$k][]=$str[$i]; ! s1 o! k8 b5 e3 w3 N# K
- continue; ) H0 F1 ^3 X1 ~
- } 7 M6 l& |/ p q5 v- {
- else
5 H2 B# G5 A* v) z1 m - {
# |. r/ ~$ B) ] - $ptag[$k] = implode('',$ptag[$k]);
: q7 s4 s( r+ Y* ~" c - $k++;
2 D' p6 B3 C8 o9 g. z1 s - break;
2 M/ w# ^. `( {3 ] - }
/ {' i8 c1 @( j* O$ x P+ j% K - }
2 I5 L* i! D5 y; v# ^$ z) h5 I - $i++; 8 N8 o3 n) t. a2 p
- continue; 0 ^7 q; W! \% c4 L" R- B
- }
: }6 x# W- m Q- X6 n; t - else
$ L- H0 H1 A, F' e# A - { % ?: ~. J3 f0 x" [' u& l# { ]
- //$re.=substr($str,$i,1); - M3 D! e1 _/ Y1 b. w
- $word++;
+ N3 g, B9 f# B9 R# B8 J" E - $i++;
4 L9 b/ w9 e- l# Q' m4 @) R - }
. u* X; x. w- ~9 _1 p9 o! W - }
( k O" _; R8 w4 \# ]2 e - foreach ($etag as $val)
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6 q3 j5 K* f2 r3 G - $key1=array_search($val,$stag); - ~9 V2 S" u+ ~
- if ($key1 !== false) unset($stag[$key]);
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- foreach ($stag as $key => $val)
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, `/ K; s/ E: U - if (in_array($val,array('br','img'))) unset($stag[$key1]);
+ G: L# ?" ?( V% A6 a; v - }
/ z; p. @, ~# ]+ o3 g9 Z - array_reverse($stag);
5 R+ i0 h% b# W. g, l L$ |! z - $ends = '</'.implode('></',$stag).'>'; ! h- _) Q7 C f3 K3 y
- $re = substr($str,0,$i).$ends;
$ z! Y, f/ X1 v' |6 e6 t5 B - if($more) $re.='...';
5 @) T, ~0 v* L# ~# n - return $re; ; f0 i8 F& G, h9 S1 I9 k% b9 y
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-
$ f$ w. P" h% D4 N+ p3 ?; K7 {/ i - $str=<<<EOF
5 s2 H2 t9 A6 O0 ]% p( `9 V - <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> 3 Q$ q: L! {' U; A( X) G3 B
- <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> & F" D& |/ V# q4 i4 x1 m
- <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>
& C& z$ Q' L2 w1 \6 x5 x. n. N - <h3>What is Free Software?</h3> # T: _& v6 @6 ~0 z- \
- <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> 5 w) J+ }6 X, T7 C$ M( g! v$ o
- <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> , O) C( b% @% @: g+ \& w+ E
- <ul>
, C2 c/ I- t _$ X' x. w' t - <li>The freedom to run the program, for any purpose (freedom 0). </li> " E$ K, l: s# q3 K& z
- <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> 6 Y2 D4 c3 h X* E" `* |
- <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li> 3 p* b3 |1 O% c" E( j
- <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>
+ f/ [& V# L( U! Z5 Q' ] M - </ul> 0 \9 |9 Q0 n% L
- <h3>What is the Free Software Foundation?</h3> 2 O7 j, G# V8 O k! E& T( @
- <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> . L+ a; P3 ^, [( N
- <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> , T# ^& C0 p2 d5 E
- <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>
1 J% r! E1 U7 |# n7 n/ _$ Z - <!--
- F: O) _" l! p9 i, u+ k2 Y - Keep link lines at 72 characters or lynx will break them poorly
: m; [ X V( x( J: S5 f+ g - Obviously, we list ONLY the most useful/important URLs here 4 s5 B' Z; U8 w( P2 C/ z
- Keep it short and sweet: 3 lines and 2 columns is already enough * b0 p; ]( j2 |4 S# f
- --><!-- BEGIN GNUmenu --> * B, k0 n5 w! W
- EOF;
u+ I5 d! x' [& B" [! s - echo phpos_chsubstr_ahtml($str,800);
# C7 z$ m9 L7 e8 g1 C - ?>
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