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
?2 T# M- w5 ?; w; t$ B8 Y - /**
1 B4 A! U: t8 o+ y- Q - * 截取HTML字符串 允许忽略HTML标志不计
! H& k$ o3 w) x; O6 D; z - *
" d- m3 ] F- X+ g/ m - * Author:学无止境 ) U S; w! I; u
- * Email:xjtdy888@163.com
4 q n; W0 K+ x4 \7 _7 Q. a6 q - * QQ: 339534039
7 e* P# Z$ ~9 D+ X ~ - * Home:http://www.phpos.org 0 L! x6 h9 T4 a
- * Blog:http://hi.baidu.com/phps 4 A$ J, S0 \1 L
- *
# R6 }0 x7 Z: W- e, `+ A; x& f - * 转载请保留作者信息
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/ y Z0 [3 V" `" c" X - *
3 z: m( p: O0 i, m' r: L; Q - * @param 要截取的HTML $str * y6 A3 Z4 `6 x
- * @param 截取的数量 $num 4 o* z, k4 l. ]
- * @param 是否需要加上更多 $more
3 F1 r& S) D6 t - * @return 截取串
; Q0 n$ Y6 A( |6 b9 d - */ ! ? X2 |# R" P( o) P2 u* v
- function phpos_chsubstr_ahtml($str,$num,$more=false) 1 _& W, P$ _* }
- { 0 i, L% b9 q4 C; V1 h- E
- $leng=strlen($str); 1 Z% E0 c: o* H6 `7 D
- if($num>=$leng) return $str; # b: f5 M; W% Q, s0 Q
- $word=0; 5 x/ k. H) w# z/ e; W8 r; J
- $i=0; /** 字符串指针 **/
9 }' N! n9 ]3 G0 ?0 S- w: Y - $stag=array(array()); /** 存放开始HTML的标志 **/
0 D) z* M; }5 H9 G" L% ?0 z - $etag=array(array()); /** 存放结束HTML的标志 **/ ! A" N( Z1 I* I/ [( r: o0 p
- $sp = 0;
2 t) J7 O! {3 W) l' }) d( k - $ep = 0;
3 L# e+ d5 J! V ]* W% o - while($word!=$num)
3 z* I# ^7 x; q4 `' y - {
9 I( k/ l9 f j- D1 K/ q - $ B* J2 ?+ a4 v- W" u. w0 g. d
- if(ord($str[$i])>128)
3 G3 V: B7 D7 K; S" E8 j - {
s8 c, R$ C+ T& ?+ N - //$re.=substr($str,$i,3);
% I. L% W# a' n. }) F! T9 y - $i+=3;
' p8 B+ W [& z- U' n+ a; L - $word++; 9 n4 \( i" ~$ V0 c2 k2 C
- } B3 X, E5 g- K2 v' \' p
- else if ($str[$i]=='<')
! @1 n- e9 \/ ~. q2 [5 z# F - { " |" N- O" i5 T- V3 h% U
- if ($str[$i+1] == '!')
; i' {1 C! s5 ^1 Z - { ! U8 l7 E, o" ]1 i. t# Z, f) w C
- $i++;
+ t2 j0 d$ S# c9 c W; W' d1 k+ D - continue; * Q6 d. c( z7 t% h4 |
- }
S7 a1 |/ q& m4 f -
* I; [+ ]1 ^1 ?: {8 E. d6 G- t - if ($str[$i+1]=='/') 5 C; u: l5 N6 w5 o6 u
- { : l0 V- e: }1 |/ L" e3 t7 H- R
- $ptag=$etag ; - ]1 M: n3 B* @- R( y4 u2 P3 ~6 M
- $k=$ep; 3 g/ D7 v8 n" p& B0 c) X6 J
- $i+=2; 4 D L6 B5 x# Q
- }
; \. x2 d$ e8 P5 `/ Z4 w - else
# k! Y& u$ V6 \ - { 9 Q0 |# w4 `4 _6 ]
- $ptag=$stag;
j! D7 R7 U9 g0 h' q0 v' W - $i+=1; : @$ I" a! ^1 t# ]4 }
- $k=$sp;
^- @: c( L* k4 y4 l I - } ; k0 o% b v+ B
- ! q; A6 A+ w d1 G/ X2 x
- for(;$i<$leng;$i++) # m0 B) X& X6 W) `$ T4 b8 a
- {
2 S0 p4 h" F& Z - if ($str[$i] == ' ')
- _; \9 R6 Y* H5 Y, w9 P, J - {
- i' k$ Y: I6 u' c; Y - $ptag[$k] = implode('',$ptag[$k]); # a3 }; i& m! ?: P2 _3 S
- $k++;
- v$ A! H3 N/ y; Y2 a1 d+ B# @ - break;
8 v. i9 y, p8 e* f O - } 0 S* N. C5 H/ }- b7 A
- if ($str[$i] != '>') ; R i/ d. |* F. V" U. g# x& y
- { + b& V; \ G \
- $ptag[$k][]=$str[$i]; 1 |( ]# k+ G1 {0 e
- continue; + _5 s+ W' @6 N) |5 w: P% X
- }
4 x2 |/ s9 |$ z" z - else % q7 e$ D8 Y/ |. x. T+ j) T9 {% q
- { # X, d( I3 v# K" l8 S& I
- $ptag[$k] = implode('',$ptag[$k]);
7 n4 B% F! X' f - $k++; 0 g; ~, X. S$ e) N8 D
- break;
6 d2 f# t e% ]8 a$ @ - } ' W" L+ L+ K$ p0 U1 W6 u% A$ W
- }
7 |8 }* v4 u V2 n - $i++; * ?' H9 F% j% X3 { V
- continue; $ r9 N g( Q. u9 q ]$ s
- }
- W9 K* N, N d - else
\1 G( K' N- z - {
% M9 ?- L8 w$ a2 h* a4 ^2 R1 r - //$re.=substr($str,$i,1); , ]( M- S4 a7 f2 ^6 |
- $word++; 1 V/ `; h+ a) K) D
- $i++; 7 `2 H8 y+ E& G
- }
9 I, i2 M/ w& l t5 c- N - } 4 r3 I7 v' q4 ~: I# s K+ `% L8 E
- foreach ($etag as $val) 2 c5 k4 O7 T& \) E& E) u
- { # q! k0 h7 {6 J) D
- $key1=array_search($val,$stag);
2 n1 R, U% E0 N; C - if ($key1 !== false) unset($stag[$key]);
/ |/ `8 I1 X) S q: M' [* @ - }
8 |0 S7 r( |. O: \, Q - foreach ($stag as $key => $val)
6 b6 ~. m5 [- |/ k7 } - {
1 @! u: x1 h5 u* R' X. v. ` - if (in_array($val,array('br','img'))) unset($stag[$key1]);
0 r- J2 y( [$ {3 L - }
$ I0 A' g) Y0 t2 s+ t. s* p$ V& | - array_reverse($stag);
& {' s! c0 y4 h4 A - $ends = '</'.implode('></',$stag).'>';
' x0 c; p6 W0 H0 E - $re = substr($str,0,$i).$ends;
; @! |, p1 V: @; m) m - if($more) $re.='...'; 3 x+ e# U L9 c% m
- return $re; O- M7 E- @1 r5 s4 V
- }
* u2 F( C4 j3 R+ I. A6 C -
- f' [$ c& p$ B. N, z - $str=<<<EOF
% ~1 }, ]& W9 I8 \0 ^, ` - <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> / y6 ?, c7 E4 K% U
- <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p>
d( e# `5 G7 X; }: B1 `% Y- j/ W- @ - <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p> . |* D% A L L3 A. Y- W
- <h3>What is Free Software?</h3>
0 s% w" A4 i( _ j$ ] - <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>
& j! V W/ V" d: q K; c - <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>
/ g% N% j! S. ?1 X7 i( \6 L$ } - <ul> 0 J9 G6 D1 `3 }/ @* F4 f+ g
- <li>The freedom to run the program, for any purpose (freedom 0). </li>
$ A& [8 C$ i: }6 h# f8 D0 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>
, n2 Y5 a9 K) m9 L, z% S" Y# g, u - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
+ w$ a! K. i1 e! T - <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>
. W5 ?* F9 y7 A2 _6 y' y: C) r - </ul>
8 l* c0 p% Z8 E9 l$ O2 l - <h3>What is the Free Software Foundation?</h3> ; j9 {0 h8 {, r$ f4 B9 c/ A
- <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> " m; n* T1 L6 _
- <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 y& y# k3 t$ {# B. @6 R ~. p3 q7 i - <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>
" t1 V; U3 ~. W. m4 j$ a4 C. Y - <!-- $ }* w& B" _5 j1 K
- Keep link lines at 72 characters or lynx will break them poorly
. R: E1 x6 }- w5 H v - Obviously, we list ONLY the most useful/important URLs here 2 E& X$ ?) F) x5 N$ H$ M/ h+ e
- Keep it short and sweet: 3 lines and 2 columns is already enough
% W; l& ^* o/ \% ?5 X - --><!-- BEGIN GNUmenu --> # J9 E/ C; C% G# P) E( z5 d
- EOF; 7 Z, Q: M" `, M1 J3 k! {
- echo phpos_chsubstr_ahtml($str,800); + D. e& p6 N2 U- H8 A- _
- ?> 9 X0 ?& ^7 p0 d" O
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