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 7 [: L& K/ j6 ]6 a3 a
- /**
4 {/ d' X u- w1 ?6 d - * 截取HTML字符串 允许忽略HTML标志不计
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- * Author:学无止境
5 |6 R' B- A/ R# N+ u' O3 j - * Email:xjtdy888@163.com / [* t1 D: o* H) F. ` D
- * QQ: 339534039 : O) G: o; `4 {! J1 @
- * Home:http://www.phpos.org
6 J4 e X9 w2 `3 {9 s& J - * Blog:http://hi.baidu.com/phps / ^" Y$ e2 S( l" l' J/ q+ P% s
- *
& R, J3 H! A9 N( ]8 U0 j0 G) X+ r - * 转载请保留作者信息 N$ h% C2 P/ _0 _$ |% @
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- * : A2 n6 F/ r+ r
- * @param 要截取的HTML $str 5 {/ c' y: U; p% Q
- * @param 截取的数量 $num % K8 F# A* S: i$ k, w. J
- * @param 是否需要加上更多 $more 7 J: Y# J T7 C+ M) J2 x4 d
- * @return 截取串
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- function phpos_chsubstr_ahtml($str,$num,$more=false)
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- $leng=strlen($str); 7 T' c7 g) D9 y' y3 r2 S
- if($num>=$leng) return $str; 5 |/ m9 F" d$ v8 p4 \0 v0 m
- $word=0; 9 p9 q/ K% m) L+ ?
- $i=0; /** 字符串指针 **/ ' P1 W" o6 y- {- M8 ^4 C
- $stag=array(array()); /** 存放开始HTML的标志 **/ : d6 K6 T" r) Z) \2 Q* m
- $etag=array(array()); /** 存放结束HTML的标志 **/ ' q9 v0 n+ i# M) h
- $sp = 0; ( ]) ^0 T/ x: a' b& r$ Q# o/ y9 o
- $ep = 0;
8 f6 K, l3 W6 i - while($word!=$num) 6 w# w$ o, ^5 y- t( s! U0 ~$ |, @
- {
0 R3 E1 Y V- e& u" r) E: g7 U6 D( { S -
0 S/ ^, C$ ] \ N - if(ord($str[$i])>128) ) @5 d$ t6 {# G2 i
- { 4 U& x8 Y) }! ~% g& g I
- //$re.=substr($str,$i,3); \4 q7 x! V6 t# x& A6 _% P) C6 H, i
- $i+=3;
" k1 E; h P r0 {- @ - $word++;
[9 y0 M% F3 L7 T+ v5 ]' } - }
9 k$ V; V- f6 }+ _! h2 j4 b - else if ($str[$i]=='<') 1 P' F- U3 [) v; S! j( U1 {. L5 D
- {
0 I- q# g9 a6 ^# n4 N6 z$ b - if ($str[$i+1] == '!') 3 R* u/ z1 {6 @, C: x$ P
- {
8 N$ U' @+ ?! a* d/ K - $i++; 8 ]7 q* N6 L5 `: f" w- d
- continue; 2 i* v) e6 S+ u- l6 _% x) q- E
- }
7 v& W* |; J. y. a -
0 U! Q" Y! A( ]! c( r: O - if ($str[$i+1]=='/')
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- $ptag=$etag ;
+ G, S2 S1 Y7 A( a - $k=$ep;
5 b1 f2 e! S2 l- k6 x - $i+=2; 4 D. }5 e* L6 k0 R' O( `
- } 3 k1 O K6 V/ i v3 N0 ^+ `
- else
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- $ptag=$stag;
1 z$ G7 [" X" K" q - $i+=1; 8 g' \+ I" r! s& b) K" p6 `
- $k=$sp;
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- for(;$i<$leng;$i++)
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- if ($str[$i] == ' ') 2 g: [8 ~; \+ Z& p+ n2 H
- {
9 W8 s9 D& X+ D4 r4 ] - $ptag[$k] = implode('',$ptag[$k]);
, o0 m9 Y( P: i+ \ - $k++; 4 s9 }9 r: l- ~' ]: Z
- break;
t$ G) m2 w2 a9 B- V* Y - }
1 [; S+ P- t: Z - if ($str[$i] != '>') 5 l6 U3 a) Z" y k$ i( P
- {
4 U* x& v" n6 {. z0 N - $ptag[$k][]=$str[$i];
" ?. O4 R f, y$ h5 f3 E - continue; & S6 U( h* }% t; K$ T+ \1 x
- } # R8 o3 R# d& A6 _& w
- else ) X6 R" P, u6 x/ { v1 t8 g
- {
5 B& M" r; b. j/ T+ _8 d - $ptag[$k] = implode('',$ptag[$k]);
) }! J( Q+ L; y" X$ w) J& |/ g% D - $k++; / }; D( T4 [8 X$ R: T
- break; " S2 h3 c/ J6 ]3 l
- }
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- $i++; ' b: X7 ^ o( q/ B% C% V$ m
- continue;
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- else
_% ]# x; e! S3 d" |. s - {
+ V4 p: H$ J! E4 h - //$re.=substr($str,$i,1); ' t0 Z, |, z, q k" g, O
- $word++;
5 J+ ^( t s1 @' P4 L* [2 ^ - $i++; & j8 W/ c8 P/ G( u; o
- }
/ ~0 \, U' P5 |/ ? - }
1 y! i4 \( I, k1 F5 k - foreach ($etag as $val) 0 u5 e7 }" G" a" b) p, C
- {
* P6 u- C' s- k) W+ ~ - $key1=array_search($val,$stag);
1 {; O3 g4 a/ e t - if ($key1 !== false) unset($stag[$key]);
5 p# B3 e7 D: Y6 m, [1 b, ^ D - }
2 _# w9 w/ z1 I3 t: c - foreach ($stag as $key => $val) 5 M; A3 _! L/ }5 Q8 ^2 ^
- {
) v" @9 P# |5 L9 d5 g" E0 E - if (in_array($val,array('br','img'))) unset($stag[$key1]);
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- array_reverse($stag); 1 c1 p; i" X7 F9 v1 I
- $ends = '</'.implode('></',$stag).'>'; / p, s/ r4 p. p) O! j6 ]& _
- $re = substr($str,0,$i).$ends;
, U* U, D& t% ~! }* U7 r4 [! }; N - if($more) $re.='...';
+ l6 e# K- K( G2 x+ a - return $re; ) v) N* E9 z d x! ?- O
- } . j [& L7 m, @0 V. O
-
( x9 V6 m2 f" i. g4 P: ? - $str=<<<EOF 5 ^- b6 e% X- `6 p
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> + S- y9 U e7 Y2 w$ ~
- <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> 6 T+ F) J: R) P- j. Z
- <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>
) o; C/ R% x) q - <h3>What is Free Software?</h3>
! z7 \4 R% K2 h% q, K' R - <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>
4 V2 R4 ~! X+ J - <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>
3 |* Q8 R6 i. \, s/ }& W - <ul> 3 ~7 I5 w/ s8 x$ B; l
- <li>The freedom to run the program, for any purpose (freedom 0). </li> 7 d$ F& U6 o" j, p9 g# Q6 T2 X/ u
- <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> 5 L; P8 r( t+ \8 @ Y/ u( R2 ~( ^: ^
- <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li> 8 x9 a7 b. r1 H' V. ?1 X! A: P
- <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> & ~7 {! N9 |+ |" V
- </ul>
$ |1 ~" s; h: S. Q) p - <h3>What is the Free Software Foundation?</h3> 0 `: S- W, R3 h! Y' Z
- <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> 5 q4 u. K9 f7 P1 s% 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> - J, D7 T3 f# n9 N9 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>
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- Keep link lines at 72 characters or lynx will break them poorly
" c* [' Z* ^% _4 g4 j) F ~. Y - Obviously, we list ONLY the most useful/important URLs here 3 K( S2 G8 B6 l, O. l+ S+ u7 I0 R
- Keep it short and sweet: 3 lines and 2 columns is already enough
. H$ `+ `" K1 Y+ P# I - --><!-- BEGIN GNUmenu --> " T! K) h: R/ B$ Z7 g& @
- EOF;
: n# C0 C9 G) B& \; F- m - echo phpos_chsubstr_ahtml($str,800);
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