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PHP Intercept String function (Chinese string) (1/2)

Source: Internet
Author: User
Tags memory usage strlen
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The code is as follows Copy Code

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 the start tag, then the stack, if it is corresponding to the end tag is out of the stack
if (Preg_match ('/< ([^/]+)? >/i ', $tag, $r)) {
echo ' into stack: ', Htmlspecialchars ($r [1]), ' <br/> ';
Array_push ($tagstack, $r [1]);
}
ElseIf (Preg_match ('/'. $tagstack [Count ($tagstack)-1]. ' /', $tag)) {
Echo ' Out stack: ', Htmlspecialchars ($tagstack [Count ($tagstack)-1]), ' <br/> ';
Array_pop ($tagstack);
}

$tag = ';
Continue
}

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


The final result of Echo '

Stack is empty direct return
if (empty ($tagstack)) {
return $resultstr;
}
Otherwise remove the start tag without the 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<p>c3<em>d4</em>e5</p>f6</body>g7h8";

echo ' processing results are: <br/>

echo "Memory Usage:" (Memory_get_usage ()-$stmem), ' <br/> ';

echo "Algorithm run Time (microtime):" (Microtime (True)-$sttime), ' <br/> ';

Method Two

/

The code is as follows Copy Code

**
* Html_substr of function name
* Function intercepts the specified length of string from the HTML string, and the HTML tag is not counted
* Parameter
* $str the string to be intercepted
* $len the length to be intercepted
* $mode mismatched mark processing mode 0 Delete (default), 1 padded
* Return to the intercepted string
* Description
* Does not consider multibyte characters, only bytes do count units
* No separate tags are considered
**/
function Html_substr ($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<em>abc</em>456<em>def</em>789";

Echo ' <xmp> ';
Echo Html_substr ($STR, 5). Php_eol;
Echo Html_substr ($str, 5, 1);

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Related Keywords:
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