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
+ N6 d/ D1 s8 m; i- |; G5 L - /** 0 p7 x3 E& l3 n' B
- * 截取HTML字符串 允许忽略HTML标志不计 ! w' _% c9 H& g' s( }) p
- * 9 H) p* s; N0 N! V( ~$ B& O
- * Author:学无止境
' J% C9 n( m0 N; x: R( T: H! [ - * Email:xjtdy888@163.com ( h0 G; P m6 n7 R; S# y
- * QQ: 339534039
\% i/ b( Z T/ w( C m5 I. F4 H4 h - * Home:http://www.phpos.org 5 }9 t8 b, h* o
- * Blog:http://hi.baidu.com/phps
8 m1 X0 s: D) s& S# m0 Q/ c( k! M - *
4 G5 t, d% t A J - * 转载请保留作者信息 5 U9 ^& _+ H4 B( A1 K
-
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- * @param 要截取的HTML $str ' s# t+ w! H2 Z3 F4 X3 \
- * @param 截取的数量 $num
' D: ]; M6 D; W9 W9 R& _$ a - * @param 是否需要加上更多 $more 4 i: H( c) P- P* H7 J/ |6 D
- * @return 截取串
+ x; v7 ?9 x9 E - */
: H( M8 {* \. C; {2 ?5 |0 W, I - function phpos_chsubstr_ahtml($str,$num,$more=false)
/ ^$ o& ^2 |% V+ N2 y" E - { ; z! [+ V8 D, k% K
- $leng=strlen($str); 3 A- R% v/ t( ?. b/ S
- if($num>=$leng) return $str;
2 V1 v& O8 F% w6 ] - $word=0;
7 t% z0 c, C7 ^) u# Z - $i=0; /** 字符串指针 **/
" {$ X2 d u0 s0 e - $stag=array(array()); /** 存放开始HTML的标志 **/ " h5 }' Z# `8 X% G& V3 w
- $etag=array(array()); /** 存放结束HTML的标志 **/ 3 r) n& i5 P; o8 q: s: g' P
- $sp = 0; 5 `. C* y- m9 x) k
- $ep = 0; 6 S; I q1 ~7 {! @( K0 Y
- while($word!=$num)
3 A/ ?4 p; R/ k) R3 M/ I: z - { ; X0 E, c" G( N% d4 B
- ! ^/ F9 w U9 @% a$ e$ O$ Y
- if(ord($str[$i])>128) ; E) w+ X0 x% \% d9 |' h: O: \" }
- { / a2 X+ B: _: C& f5 X' N* w9 @
- //$re.=substr($str,$i,3);
: q- k% F. s4 Q. ~5 `# k. x - $i+=3;
3 ^- o; J6 Y" F, p/ N) R - $word++; / V7 C" Z+ |% C
- }
0 b* L5 ?- U, |" O) @2 R - else if ($str[$i]=='<') 3 F" c. z1 g X7 o
- { 6 n9 r7 Y' d' ~! U3 X- {: V, H& p
- if ($str[$i+1] == '!')
$ k) z6 r. D( x' P0 O - {
4 R9 C' y. d$ P! p( w5 V, ?) ? - $i++; ' U. g" y6 f: V6 C6 a
- continue;
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- 5 X$ Z+ Z6 t, Q8 B
- if ($str[$i+1]=='/')
" z3 z/ e+ H5 `! h- V - {
$ X% r8 @/ N t# V1 Z# N - $ptag=$etag ;
. b% a7 A; j W1 g0 ^3 \5 Q - $k=$ep; 1 {6 n" ?6 ]# l D9 a1 l# y! F/ i
- $i+=2;
5 }2 W& E4 }: A( K - }
( G* b% f) j! y7 M - else
" L1 A+ y8 W; R- D' N! `* c' j - { 6 K! b3 U. ^8 g# p" k
- $ptag=$stag;
% t* x( I; R6 a+ L - $i+=1;
0 V% O- v6 V% V5 J8 U - $k=$sp;
+ z2 K$ Y! L, Z# J& s R* O- e - } 9 q! k' d4 U& t" D
- ; ~2 x. y8 e; S, R
- for(;$i<$leng;$i++) ' R1 o! t1 g% u& @/ L0 `
- { 3 ~7 F1 V3 M1 w4 G
- if ($str[$i] == ' ') 8 \4 q4 d$ I) |- v7 b% V6 i' D
- {
9 q0 Y. A1 z' | - $ptag[$k] = implode('',$ptag[$k]);
7 |$ L' u0 B+ u" d - $k++; & a# j9 L1 g; @7 n
- break;
; X+ ]4 u) |8 M7 q+ q0 M - }
: G9 x% R' M3 r" ~/ S8 k - if ($str[$i] != '>')
4 N/ L( T' F! k# k" X - {
1 Y- G; V3 s& d( S1 `) ]+ k" o& r; Z - $ptag[$k][]=$str[$i]; ) W4 E# A+ A2 v' `* B( j0 j
- continue;
9 C8 b5 r4 M" }) W/ S6 [ - }
! {! \, h- k* I5 X0 Y - else 4 k5 @9 _0 S9 P+ t
- { 7 T. C9 R& Z& X( @9 V' O; q
- $ptag[$k] = implode('',$ptag[$k]); ) C `1 M7 z8 s# E0 x5 a, j
- $k++; 3 b- j) @1 d/ Y8 {+ U0 S
- break; % ~" e y F) k% z0 X4 M
- }
7 r3 ^5 e- v( x - } * C9 i! b: i6 F$ Q: z! W$ ^- y! q
- $i++;
& r9 h- e; H5 }+ w5 X! o/ ]0 z - continue; 0 ?& }: D# v. T$ x! E5 F) B0 Y
- } 7 B% s2 n6 D/ j. ^! `
- else 4 X" r. J/ B* R. P# X: J2 i
- { ( C1 ?( W" N/ w! b- f, u
- //$re.=substr($str,$i,1);
, n9 T2 ]% r- S" c! j8 l - $word++; * ?7 l# {2 g1 m# ? j
- $i++; 2 \( Z$ i0 a! H& a0 z3 p
- } 9 z) }3 z' A8 x& | v
- }
' ?9 O9 v" z) O2 M" E - foreach ($etag as $val)
) Q5 [# ]) g$ G2 g3 Q* Y2 j - { 2 E4 q, ^/ M4 Y/ P% ^ j A
- $key1=array_search($val,$stag); 6 o: b; Y' L3 F. R+ r
- if ($key1 !== false) unset($stag[$key]); ; M/ s* S7 }) j, G
- }
# B B$ k& U" W" Z - foreach ($stag as $key => $val) ' z# `; I# W; V' w: X8 s
- {
- v; [ K7 M5 w - if (in_array($val,array('br','img'))) unset($stag[$key1]); 8 J( E. p4 p* ^- D
- }
5 p! X" q7 J3 p* ]' w0 |) w* F8 g - array_reverse($stag);
* }+ b+ G3 B1 l6 I - $ends = '</'.implode('></',$stag).'>'; 7 T2 y# I, p1 B8 \+ ^" |' V+ x
- $re = substr($str,0,$i).$ends; ! h1 P( ]4 X' K; P; W" V7 [, m9 L
- if($more) $re.='...';
* V( E1 B$ I Y+ O" C( C5 u - return $re; ) D3 ^- {7 O6 d ?
- }
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) m& f0 }" l/ R- \0 F* e6 a6 \ - $str=<<<EOF 9 k) V* D" m) ]5 z% `
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> - J$ q0 ^' q' j& E8 e
- <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> 7 O$ l# K4 Y# o
- <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>
* f+ w8 I" v* \ S7 `" c( K - <h3>What is Free Software?</h3> 9 j7 U- L) a* Q9 S$ D
- <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> 2 i9 K4 c9 f# u" X! X# y3 ]+ f' N6 h4 R
- <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> ! I- W9 g5 H# h7 _9 g1 l
- <ul>
" u- {5 k5 `2 u& u - <li>The freedom to run the program, for any purpose (freedom 0). </li>
+ Y {5 v7 P3 Y% _9 u: c0 r5 ? - <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 a+ F g {& D+ }, q9 y: ]% E
- <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li>
, j4 t/ }9 g; W4 s* G; q - <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>
) x: C2 O# V* h6 F, c4 m* x0 [ - </ul>
# C( L" C4 f0 V - <h3>What is the Free Software Foundation?</h3>
' `; D' r+ Y" o: S' L - <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>
& a7 o# | v. u+ m7 j s% Y - <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>
$ Z9 V. i1 H; C7 b+ G& 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>
4 T3 m2 k- o6 D" a4 j% l - <!-- 6 D" v& D2 l6 C7 O( W
- Keep link lines at 72 characters or lynx will break them poorly
# W5 K$ O- M2 i' j) {, w4 q - Obviously, we list ONLY the most useful/important URLs here
6 M \6 m. I4 n5 `) m' } - Keep it short and sweet: 3 lines and 2 columns is already enough
3 d. [, @# l8 f - --><!-- BEGIN GNUmenu -->
. r1 n, ]* G, b6 R3 @9 e6 K i - EOF; ' S: K4 a" N8 a
- echo phpos_chsubstr_ahtml($str,800);
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Copy |
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