How PHP intercepts HTML strings and automatically complements HTML tags
This article mainly introduces the PHP interception of HTML strings and automatic completion of HTML tags, PHP is very useful for HTML operation skills, with a certain reference value, the need for friends can refer to the next
This article describes how PHP intercepts HTML strings and automatically complements HTML tags. Share to everyone for your reference. The specific analysis is as follows:
Here summarizes the use of PHP to intercept HTML strings automatically complete HTML tags, the actual development will often encounter, many people directly strip_tags filter out the HTML tags, but only the plain text, the readability is very poor, the following is a function, the code is as follows:
The code is as follows:
/**
* Capture HTML and auto-complete closure
* @param $html
* @param $length
* @param $end
*/
function subhtml ($html, $length) {
$result = ";
$tagStack = Array ();
$len = 0;
$contents = Preg_split ("~ (<[^>]+?>) ~si", $html, -1,preg_split_no_empty| Preg_split_delim_capture);
foreach ($contents as $tag)
{
if (Trim ($tag) = = "") continue;
if (Preg_match ("~< ([a-z0-9]+) [^/>]*?/>~si", $tag)) {
$result. = $tag;
}else if (Preg_match ("~ ]*?>~si ", $tag, $match)) {
if ($tagStack [count ($tagStack)-1] = = $match [1]) {
Array_pop ($tagStack);
$result. = $tag;
}
}else if (Preg_match ("~< ([a-z0-9]+) [^/>]*?>~si", $tag, $match)) {
Array_push ($tagStack, $match [1]);
$result. = $tag;
}else if (Preg_match ("~ ~si ", $tag)) {
$result. = $tag;
}else{
if ($len + mstrlen ($tag) < $length) {
$result. = $tag;
$len + = Mstrlen ($tag);
}else {
$str = msubstr ($tag, 0, $length-$len + 1);
$result. = $str;
Break
}
}
}
while (!emptyempty ($tagStack)) {
$result. = ' ';
}
return $result;
}
/**
* Intercept Chinese strings
* @param $string string
* @param $start starting bit
* @param $length length
* @param $charset Code
* @param $dot Additional strings
*/
function Msubstr ($string, $start, $length, $dot = ', $charset = ' UTF-8 ') {
$string = Str_replace (' & ', ' ' ', ' < ', ' > ', '), Array (' & ', ' "', ' < ', ' > ', '), $string);
if (strlen ($string) <= $length) {
return $string;
}
if (Strtolower ($charset) = = ' Utf-8 ') {
$n = $tn = $noc = 0;
while ($n < strlen ($string)) {
$t = Ord ($string [$n]);
if ($t = = 9 | | $t = = 10 | | (<= $t && $t <= 126)) {
$tn = 1; $n + +;
} elseif (194 <= $t && $t <= 223) {
$tn = 2; $n + = 2;
} elseif (224 <= $t && $t <= 239) {
$tn = 3; $n + = 3;
} elseif (<= $t && $t <= 247) {
$tn = 4; $n + = 4;
} elseif (248 <= $t && $t <= 251) {
$tn = 5; $n + = 5;
} elseif ($t = = 252 | | $t = = 253) {
$tn = 6; $n + = 6;
} else {
$n + +;
}
$noc + +;
if ($noc >= $length) {
Break
}
}
if ($noc > $length) {
$n-= $tn;
}
$strcut = substr ($string, 0, $n);
} else {
for ($i = 0; $i < $length; $i + +) {
$strcut. = Ord ($string [$i]) > 127? $string [$i]. $string [+ + $i]: $string [$i];
}
}
return $strcut. $dot;
}
/**
* Get the length of the string, including Chinese and English.
*/
function Mstrlen ($str, $charset = ' UTF-8 ') {
if (function_exists (' mb_substr ')) {
$length =mb_strlen ($str, $charset);
} elseif (Function_exists (' iconv_substr ')) {
$length =iconv_strlen ($str, $charset);
} else {
Preg_match_all ("/[x01-x7f]|[ xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]| [Xe1-xef] [X80-XBF] [x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]| [Xf1-xf7] [X80-XBF] [X80-XBF] [x80-xbf]/], $text, $ar);
$length =count ($ar [0]);
}
return $length;
}
example, the code is as follows:
Copy the code code as follows:
* @param the HTML $str to intercept
* Number of @param intercepted $num
* @param need to add more $more
* @return Intercept string
*/
function phpos_chsubstr_ahtml ($str, $num, $more =false)
{
$leng =strlen ($STR);
if ($num >= $leng)
return $str;
$word = 0;
$i = 0; /** string Pointer **/
$stag =array (Array ()); /** store the start HTML flag **/
$etag =array (Array ()); /** store End HTML flag **/
$SP = 0;
$EP = 0;
while ($word! = $num)
{
if (Ord ($str [$i]) >128)
{
$re. =substr ($str, $i, 3);
$i +=3;
$word + +;
}
else if ($str [$i]== ' < ')
{
if ($str [$i +1] = = '! ')
{
$i + +;
Continue
}
if ($str [$i +1]== '/')
{
$ptag =& $etag;
$k =& $ep;
$i +=2;
}
Else
{
$ptag =& $stag;
$i +=1;
$k =& $sp;
}
for (; $i < $leng; $i + +)
{
if ($str [$i] = = ")
{
$ptag [$k] = Implode (", $ptag [$k]);
$k + +;
Break
}
if ($str [$i]! = ' > ')
{
$ptag [$k][]= $str [$i];
Continue
}
Else
{
$ptag [$k] = Implode (", $ptag [$k]);
$k + +;
Break
}
}
$i + +;
Continue
}
Else
{
$re. =substr ($str, $i, 1);
$word + +;
$i + +;
}
}
foreach ($etag as $val)
{
$key 1=array_search ($val, $stag);
if ($key 1!== false) unset ($stag [$key]);
}
foreach ($stag as $key = $val)
{
if (In_array ($val, Array (' BR ', ' img ')) unset ($stag [$key 1]);
}
Array_reverse ($stag);
$ends = ' ';
$re = substr ($str, 0, $i). $ends;
if ($more) $re. = ' ... ';
return $re;
}
PHP intercepts the string, generate a summary of the article, we often need to write a blog to display the first part of the article, but also afraid of improper truncation to destroy the closed tag to cause the entire document structure damage, the code is as follows:
Copy the code code as follows:
function Text_zhaiyao ($text, $length) {///Article Summary generation functions $test: Content $length: summary length
Global $Briefing _length;
Mb_regex_encoding ("UTF-8");
if (Mb_strlen ($text) <= $length) return $text;
$Foremost = mb_substr ($text, 0, $length);
$re = "< (/?)
(p| div| F12 h2| h3| h4| h5| h6| address| pre| table|tr| td|th| Input| Select| textarea| Object| a| ul| ol| li|
base| meta| link|hr|br| param| Img| area| Input| SPAN) [^>]* (;?) ";
$Single = "/base| meta| link|hr|br| param| Img| area| Input|br/i ";
$Stack = Array (); $posStack = Array ();
Mb_ereg_search_init ($Foremost, $re, ' I ');
while ($pos = Mb_ereg_search_pos ()) {
$match = Mb_ereg_search_getregs ();
/* [child-matching formulation]:
$matche [1]: A "/" charactor indicating whether "<...>" friction is
Closing part
$matche [2]: Element Name.
$matche [3]: Right > of a "<...>" friction
*/
if ($match [1]== "") {
$Elem = $match [2];
if (Mb_eregi ($Single, $Elem) && $match [3]! = "") {
Continue
}
I hope this article is helpful to everyone's PHP programming.
http://www.bkjia.com/PHPjc/971935.html www.bkjia.com true http://www.bkjia.com/PHPjc/971935.html techarticle how PHP intercepts HTML strings and automatically complements HTML tags this article mainly introduces the way PHP intercepts HTML strings and automatically complements HTML tags, which is a very useful technique for HTML operation.
