PHP intercept HTML Article _php tutorial

PHP intercepts HTML code, considering the closure of HTML tags

/* Generate Summary
* @param (String) $body
* Text
* @param (int) $size
* Abstract Length
* @param (int) $format
* Input Format ID
*/
function Blog_summary ($body, $size, $format = NULL) {
$_size = Mb_strlen ($body, "utf-8");

if ($_size <= $size) return $body;

PHP filter in input format
/*
if (!isset ($format) && filter_is_php ($format)) {
return $body;
}
*/

$strlen _var = strlen ($body);

does not contain HTML tags
if (Strpos ($body, ' < ') = = = = False) {
Return Mb_substr ($body, 0, $size);
}

Contains truncation flags, priority
if ($e = Strpos ($body, ' )) {
Return Mb_substr ($body, 0, $e);
}

HTML code Markup
$html _tag = 0;

Digest string
$summary _string = ";

/**
* Arrays are used as HTML tags that appear within the record summary scope
* Start and end are saved in left and right keys respectively
* If the string is:

A

, assuming P is not closed
* Array is: Array (' left ' = = Array (' h3 ', ' P ', ' B '), ' right ' = ' B ', ' H3 ');
* Full HTML tag only, */
$html _array = Array (' Left ' + = Array (), ' right ' = = Array ());
for ($i = 0; $i < $strlen _var; + + $i) {
if (! $size) {
Break
}

$current _var = substr ($body, $i, 1);

if ($current _var = = ' < ') {
HTML code starts
$html _tag = 1;
$html _array_str = ";
}else if ($html _tag = = 1) {
A section of HTML code ends
if ($current _var = = ' > ') {
/**
* Remove the trailing spaces, such as
< img src= ""/> may appear leading and trailing spaces
*/
$html _array_str = Trim ($html _array_str);

/**
* Determine if the last character is/, if it is, the label is closed, not recorded
*/
if (substr ($html _array_str,-1)! = '/') {

Determines whether the first character/, if it is, is placed in the right unit
$f = substr ($html _array_str, 0, 1);
if ($f = = '/') {
Remove
$html _array[' right ' [] = Str_replace ('/', ' ', $html _array_str);
}else if ($f! = '? ') {
To determine if it is a., if, PHP code, skip

/**
* Determine if there are half-width spaces, if any, separated by a space, the first cell is an HTML tag
* IF

*/
if (Strpos ($html _array_str, ")!== false) {
Split into 2 cells, there may be multiple spaces, such as:

$html _array[' left ' [] = Strtolower (current (Explode ('), $html _array_str, 2));
}else{
/**
* * If there are no spaces, the entire string is an HTML tag, such as:

such as
* Uniform conversion to lowercase
*/
$html _array[' left ' [] = Strtolower ($html _array_str);
}
}
}

String Reset
$html _array_str = ";
$html _tag = 0;
}else{
/**
* Make a string of characters between < >
* For extracting HTML tags
*/
$html _array_str. = $current _var;
}
}else{
Non-HTML code only counts
-$size;
}

$ord _var_c = Ord ($body {$i});

Switch (TRUE) {
Case (($ord _var_c & 0xE0) = = 0xC0):
2 bytes
$summary _string. = substr ($body, $i, 2);
$i + = 1;
Break
Case (($ord _var_c & 0xF0) = = 0xE0):

3 bytes
$summary _string. = substr ($body, $i, 3);
$i + = 2;
Break
Case (($ord _var_c & 0xF8) = = 0xF0):
4 bytes
$summary _string. = substr ($body, $i, 4);
$i + = 3;
Break
Case (($ord _var_c & 0xFC) = = 0xF8):
5 bytes
$summary _string. = substr ($body, $i, 5);
$i + = 4;
Break
Case (($ord _var_c & 0xFE) = = 0xFC):
6 bytes
$summary _string. = substr ($body, $i, 6);
$i + = 5;
Break
Default
1 bytes
$summary _string. = $current _var;
}
}

if ($html _array[' left ') {
/**
* Compared to the left and right HTML tags, not enough to complete
*/

/**
* Swap left order, the order of supplementation should be the opposite of the order in which HTML appears
* If the string to be complete is:

ABCABC

Abc
* The order of replenishment should be:

*/
$html _array[' left '] = Array_reverse ($html _array["left");

foreach ($html _array[' left '] as $index = + $tag) {
Determine if the label appears in right
$key = Array_search ($tag, $html _array[' right ');
if ($key!== false) {
appears, remove the cell from right
unset ($html _array[' right ' [$key]);
}else{
Does not appear, need to complete
$summary _string. = ' ';
}
}
}
return $summary _string;
}

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