This article illustrates the way PHP intercepts HTML strings and automatically complements HTML tags. Share to everyone for your reference. The specific analysis is as follows:
Here is a summary of the use of PHP to intercept HTML strings automatically complement HTML tags, the actual development will often encounter, many people directly strip_tags filter out the HTML tags, but only the remaining plain text, readability is very poor, the following is a function, the code is as follows:
Copy Code code as follows:
/**
* Interception of HTML, and automatic completion of the full 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 ("~</" ([a-z0-9]+) [^/>]*?>~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)) {
$result. = ' </'. Array_pop ($tagStack). ' > ';
}
return $result;
}
/**
* Intercept Chinese strings
* @param $string string
* @param $start starting position
* @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;
}
instance, the code is as follows:
Copy Code code as follows:
* @param the HTML $str to intercept
* Number of @param intercepted $num
* Do @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 logo **/
$etag =array (Array ()); /** storage 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 = ' </'. Implode (' ></', $stag). ' > ';
$re = substr ($str, 0, $i). $ends;
if ($more) $re. = ' ... ';
return $re;
}
PHP intercept string, generate article summary, we often need to display the previous part of the article in the blog, but also afraid of improper truncation damage closed tags to cause the entire document structure damage, the code is as follows:
Copy Code code as follows:
function Text_zhaiyao ($text, $length) {//Article Digest generating 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| h1| 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 current ' <...> ' friction is
Closing part
$matche [2]: Element Name.
$matche [3]: Right > A "<...>" friction
*/
if ($match [1]== "") {
$Elem = $match [2];
if (Mb_eregi ($Single, $Elem) && $match [3]!= "") {
Continue
}
I hope this article will help you with your PHP program design.
