php interception string function (Chinese string)

Last Update:2017-08-29 Source: Internet

Author: User

Keywords Network programming PHP tutorial

Tags array_pop closed content echo function html htmlspecialchars it is

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PHP tutorial interception string function (Chinese string)
This is a php interception string function Oh, this is a support Chinese string oh, it can intercept html and Chinese and Western mixed content, and the html tag is not included in the character interception, if the html tag is not Closed, the program will automatically filter excess labels.
* /

function mysubstr ($ str, $ length) {

$ tagcnt = 0;
$ charcnt = 0;
$ tag = '';
$ maxlen = strlen ($ str);
$ resultstr = '';
$ tagstack = array ();

for ($ i = 0; $ i <$ length; $ i ++) {
if ($ str [$ i] == '<') {

$ resultstr. = $ str [$ i];

for ($ j = $ i; $ str [$ j]! = '>'; $ j ++, $ length ++) {
$ tag. = $ str [$ j];
}
$ tagcnt ++;
$ length ++;
$ tag. = '>';

// If it is the start tag, then the stack, if it is the corresponding end tag is popped
if (preg_match ('/ <([^ /] +>?> / i', $ tag, $ r)) {
echo 'into the stack:', htmlspecialchars ($ r [1]), ' ';
array_push ($ tagstack, $ r [1]);
}
elseif (preg_match ('/'.$tagstack[count($tagstack)-1].'/', $ tag)) {
echo 'pop:', htmlspecialchars ($ tagstack [count ($ tagstack) -1]), ' ';
array_pop ($ tagstack);
}

$ tag = '';
continue
}

$ charcnt ++;
$ resultstr. = $ str [$ i];
}

echo '<hr size = 1> The final result is:';

// The stack is empty and returned directly
if (empty ($ tagstack)) {
return $ resultstr;
}
// otherwise remove the start tag without an end tag
else {

while (! empty ($ tagstack)) {

$ tag = array_pop ($ tagstack);

$ index = strrpos ($ resultstr, $ tag);

for ($ i = $ index-1; $ resultstr [$ i]! = '>'; $ i ++) {
$ resultstr [$ i] = '';
}

$ resultstr [$ i ++] = '';

}

return $ resultstr;
}

}

$ sttime = microtime (true);

$ stmem = memory_get_usage ();

$ str = "a1 <body> b2 c3 d4 e5 f6 </ body> g7h8";

echo 'results in: <hr size = 1>', htmlspecialchars (mysubstr ($ str, 18)), ' ';

echo "Memory Usage:", (memory_get_usage () - $ stmem), ' ';

echo "microtime:", (microtime (true) - $ sttime), ';'
//Method Two

**
* Function name html_substr
* Function from the html string interception of the specified length of the string, html tags are not counted
* Parameters
* $ str string to be intercepted
* $ len The length to be intercepted
* $ mode does not match the treatment of the flag 0 Delete (default), 1 filled
* Return the truncated string
* Description
* Not considered multi-byte characters, only the byte count units
* Does not consider the existence of the mark alone
** /
function html_substr ($ str, $ len, $ mode = 0) {
$ ar = preg_split ('/ (<! -. * -> | <[^>] *>) / s', $ str, -1, preg_split_delim_capture);
foreach ($ ar as $ k => $ v) {
if ($ v {0}! = '<') {
$ len = $ len - strlen ($ v);
if ($ len <0) $ ar [$ k] = substr ($ v, 0, $ len);
} else $ ar [$ k] = strtolower ($ v);
if ($ len <= 0) break;
}
$ ar = array_slice ($ ar, 0, $ k + 1);
$ len = count ($ ar);
foreach ($ ar as $ k => $ v) {
if ($ v {0} == '<' && $ v [1]! = '/') {
$ ch = str_replace ('<', '</', $ v);
for ($ i = $ k + 1; $ i <$ len && $ ar [$ i]! = $ ch; $ i ++);
if ($ i == $ len)
if ($ mode)
$ ar [$ len] = $ ch. $ ar [$ len];
else
$ ar [$ k] = '';
}
}
return join ('', $ ar);
}
$ str = "123 abc 456 def 789";

echo '<xmp>';
echo html_substr ($ str, 5). php_eol;
echo html_substr ($ str, 5, 1);
$ str = "a1 <body> b2c3 d4 e 5f6 </ body> g7h8";
$ gn = 7;
$ i = $ j = $ k = 0;
while (($ c = $ str [$ i ++]) && $ j <$ gn)
{
if ($ c == '<')
{
$ tag = 1;
}
elseif ($ c == '>')
{
if (trim ($ tg, '/') == 'em')
{
$ tgs [$ j-1] = '<'. $ tg. '>';
}
else
{
if ($ tgs [$ j-1]) $ ogs [$ j-1] = '1 |'. '<'. $ tg. '>';
else $ ogs [$ j-1] = '0 |'. '<'. $ tg. '>';
}
$ tag = 0;
$ tg = '';
}
elseif ($ tag == 1)
{
$ tg. = $ c;
}
else
{
$ tmp [] = $ c;
$ j ++;
}
}
$ ts = count ($ tgs);
if ($ ts% 2) array_pop ($ tgs);
foreach ($ tmp as $ k => $ v)
{
$ ba = explode ('|', $ ogs [$ k], 2);
if ($ tgs [$ k] && $ ogs [$ k])
{
if ($ ba [0])
{
$ s. = $ v. $ tgs [$ k]. $ ba [1];
}
else $ s. = $ v. $ ba [1]. $ tgs [$ k];
}
else $ s. = $ v. $ tgs [$ k]. $ ba [1];
}
echo htmlspecialchars ($ s);

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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