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 L1 @- T6 }$ B1 p
- /** 7 v* f6 O+ @8 c4 b& x( z( X: m
- * 截取HTML字符串 允许忽略HTML标志不计 " d; r; o$ O! x) c
- *
3 ?" N6 t1 s! b* t - * Author:学无止境
$ L% a @0 s9 c3 S7 W) s - * Email:xjtdy888@163.com
4 V6 p/ J% M6 q% n6 x' q* ` - * QQ: 339534039 & `( g, z x' `8 P: R$ h, F6 t3 [
- * Home:http://www.phpos.org . O; ]" v' T' ~! k; \6 y% u3 w
- * Blog:http://hi.baidu.com/phps - x" e' q- |7 k6 P: ~7 Q7 z2 h
- * 5 p0 G: c" o% b7 a& A5 `
- * 转载请保留作者信息 G {! l F( C- o: |* J8 X4 s) K
- $ W2 z# \7 C% M; t7 L* Z9 c8 L- M+ W
- *
+ `& {8 q4 J; B& Y) ~( M - * @param 要截取的HTML $str
; Z/ ~8 D0 C! T1 T8 U7 g: \$ _ - * @param 截取的数量 $num 6 y1 O. [: K! \5 S
- * @param 是否需要加上更多 $more
2 w `! @, ~/ P& \4 O1 a3 L - * @return 截取串 + O, S0 i& O5 I/ T7 M/ e
- */ 8 h! S2 }1 Y* h$ H1 P+ P# e& y
- function phpos_chsubstr_ahtml($str,$num,$more=false) ' \9 E9 A |; u8 P8 F& a, U, L
- {
0 a/ I3 L, J! q0 e - $leng=strlen($str);
/ o+ G" R) ]) r - if($num>=$leng) return $str;
% `4 M2 _3 d& m+ | - $word=0; : a( ~4 {6 S8 C. R* z" L5 c; l
- $i=0; /** 字符串指针 **/ : O5 J$ @* T6 P
- $stag=array(array()); /** 存放开始HTML的标志 **/ 9 y ~8 N9 s1 D1 W
- $etag=array(array()); /** 存放结束HTML的标志 **/ ! P. Q% Z4 _- w* x- C
- $sp = 0; : l1 ?# U& b7 M4 p: Z
- $ep = 0;
1 w( \, n6 r! r3 K8 X - while($word!=$num) ! @4 F7 a9 y* `% l1 \9 w z
- {
8 b, R9 q. ]% n! \ - , _' x' B2 J7 \' U$ S
- if(ord($str[$i])>128)
) j! m2 O6 R% H3 R$ C - {
1 d" v6 @# g3 f+ e; i - //$re.=substr($str,$i,3);
- Y3 D) a( y, P! M- d - $i+=3; - _) y) u) u9 U' j: k. E& ? U
- $word++; 0 @& V! N. B, Z- J8 O9 D; i
- }
2 P# F: X, u8 ~% V1 C - else if ($str[$i]=='<')
0 V7 ^8 c2 m; x w* C* M; e - {
7 ]7 l/ z, L4 {. N, L - if ($str[$i+1] == '!')
+ Z* Z# M- g# P$ t - {
" ]1 [6 c* a( { `& ` - $i++;
* z& O' w5 Z" |& ? - continue;
! l9 g3 N' L# l q, J$ x9 Z1 w' e) u! s& y - } V2 {9 T9 O+ i" C0 H* F- j1 J; [2 G
-
6 A1 b4 g6 g4 F# P9 P8 ^: _ - if ($str[$i+1]=='/')
; T; S5 _. M$ g' |# B- j - { 1 Q& Q: g; X: j" \! l( h
- $ptag=$etag ; % ~# _8 U+ k7 E) c' e4 e/ q
- $k=$ep;
& G9 A% L' [' e4 R( a - $i+=2;
) r/ N" ?, I' u8 @) T8 L - } % b2 n" ^( N# Z+ I/ U
- else
* H5 G9 p5 w% b8 N) o3 N) @; p - {
" |; l3 E' u: r3 p9 }* j: t$ W - $ptag=$stag;
8 ~# E5 O5 K9 h9 L# @ B - $i+=1;
1 N; @' U0 E- i+ x. A0 c/ N3 w - $k=$sp;
3 `4 k7 L5 Q2 ~9 g9 i1 N5 v - }
. i( q. U+ X1 f5 _ - ; u- o1 b# W, [
- for(;$i<$leng;$i++) + x6 a* V9 |7 ?& K6 M7 o" n
- {
8 t" P: V$ e _9 V* K7 S5 u - if ($str[$i] == ' ')
* _( m8 d9 \: Q: }- O% B - {
. h( [5 @ p( e - $ptag[$k] = implode('',$ptag[$k]); ; E/ @ @, d8 D9 B/ \
- $k++;
0 ?' z: C8 O2 N1 g- A! L - break;
: V, C! |/ {( U- o4 F }8 p7 Y - }
) K, z6 T7 K' D/ m* @/ l/ |( ]7 F4 | - if ($str[$i] != '>') # e7 Q- A' {2 o. I+ n0 u4 G
- {
2 E! g* {+ `0 _! M - $ptag[$k][]=$str[$i];
f6 ^1 S6 |/ A5 @/ V* F! N4 | - continue;
/ h7 P* j+ M7 r& |. ~ - } * z! {& B( k: N/ w+ h& Y
- else
9 z7 z! _4 _" T1 l: B. Z( k$ Z' u - {
/ q) D. E3 y. z- L. L; @ - $ptag[$k] = implode('',$ptag[$k]);
6 ]+ n5 Z! x. p/ M& A - $k++;
( } d# F |3 ?1 r% Y5 b, e, t - break; ; w9 _$ U; z: U8 ~7 y# k
- }
/ a1 l7 K! s& \" b3 h - }
+ j( k @$ p9 l6 Q - $i++; 3 e1 {& y; P+ ~% W4 _. W3 m
- continue; , ]' W, [ R" j+ ^. V; i# c: H
- } 2 D5 A6 S! W$ v- G
- else 0 T9 N! }4 c7 t
- { , R. ]2 Q) R5 g
- //$re.=substr($str,$i,1);
+ d e; f* d" ~+ p( o8 [# p - $word++; 0 T6 L7 F$ f6 |! \& \+ W6 h
- $i++;
- }% k% _% T; j - } 6 J, v$ T1 @7 x
- }
: E# F4 s: G3 Y2 i/ K7 Z7 p - foreach ($etag as $val) * Z$ F9 Q% S0 h5 ?; h7 ]
- {
7 B8 E. m& o5 p - $key1=array_search($val,$stag);
) c9 |$ [% n5 w& X$ I8 T/ N% a - if ($key1 !== false) unset($stag[$key]); ( I0 k6 G9 D- R, W: e* A
- }
) \. O( G' e' f - foreach ($stag as $key => $val)
2 L! @/ T6 [' r) B - {
T+ d7 o0 B+ J& z6 M/ h - if (in_array($val,array('br','img'))) unset($stag[$key1]);
. L' E5 ~" F; I9 l9 c4 E - } ) t! m8 {" k8 G1 ?
- array_reverse($stag); ! v* [8 p5 g, e8 V! V
- $ends = '</'.implode('></',$stag).'>'; * @4 A8 K6 T! }: s$ F) C
- $re = substr($str,0,$i).$ends; & A( T6 ]0 d& C+ C0 R
- if($more) $re.='...'; # g9 U8 E m3 s. u# c+ |
- return $re; ' s Y" P4 P2 }7 z4 S
- } ' x3 D; F# G- U3 ~/ L
- ! u J# G8 O& l- s# t; ?8 l
- $str=<<<EOF , h6 \4 K; K$ R) [4 w p
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3>
, f5 s$ a7 g 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>
( `( L; V1 w" w$ c% K3 I c - <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 p& c0 t t* i* M7 a, c. u
- <h3>What is Free Software?</h3>
9 ` E4 l Z# k% \; p5 e; c - <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> # M {! V; P. Z& O) j, q
- <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> 9 s! [- E7 H' s% r0 ^, x
- <ul> ( ~2 _ q. [" o8 F
- <li>The freedom to run the program, for any purpose (freedom 0). </li> + ?/ k$ g/ j9 s9 P% G# ]; m% l g
- <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> , U& e/ v: b7 O- J. Z! g8 Y" B
- <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
1 C; I' {9 I6 r. [6 J3 `0 @ - <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>
- t0 m: j# A% j; Y1 e# f4 Q - </ul> 5 v7 p" i5 t5 R9 y& V0 v
- <h3>What is the Free Software Foundation?</h3> & B6 q5 s5 F, m: f: b
- <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> . J: l# u6 B! e9 |8 d1 f0 I, _
- <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> D( E: F# ^6 g+ Z2 P
- <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> " p0 |( G: W2 j. ]- @' a
- <!--
" T/ b9 E; u) v' f P) F - Keep link lines at 72 characters or lynx will break them poorly
& @2 \9 |0 }) y5 A; h - Obviously, we list ONLY the most useful/important URLs here
6 `% _! h, y- V# ~4 U) Z - Keep it short and sweet: 3 lines and 2 columns is already enough
, ]1 v5 t6 W* Q# G) [9 q - --><!-- BEGIN GNUmenu -->
1 X! T6 W" ^( M' M8 u - EOF;
7 v- q( g' q" V" t8 G - echo phpos_chsubstr_ahtml($str,800);
7 Z5 ]# w L1 }2 Z0 H# Q - ?>
! \# x+ E5 p) G- b) A
Copy |
|