In the use of the time, you have to generate a summary of the content strip_tags (), of course, you can also add strip_tags () directly to the function, I did not engage, add it myself. Here's the function:
Copy Code code as follows:
function Cutstr ($string, $length, $charset, $dot) {//character, interception length, character set, end character
if (strlen ($string) <= $length) {
return $string;
}
$pre = Chr (1);
$end = Chr (1);
Protect Special strings
$string = str_replace (Array (' & ', ' "'", ' < ', ' > '), Array ($pre.) & '. $end, $pre. ' "'. $end, $pre. ' < '. $end, $pre. ' > '. $end), $string);
$strcut = ';
if (Strtolower ($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 + +; $noc + +;
} elseif (194 <= $t && $t <= 223) {
$tn = 2; $n + 2; $noc + 2;
} elseif (224 <= $t && $t <= 239) {
$tn = 3; $n + 3; $noc + 2;
ElseIf (<= $t && $t <= 247) {
$tn = 4; $n + 4; $noc + 2;
} elseif (248 <= $t && $t <= 251) {
$tn = 5; $n + 5; $noc + 2;
} elseif ($t = = 252 | | $t = = 253) {
$tn = 6; $n + 6; $noc + 2;
} else {
$n + +;
}
if ($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];
}
}
Restore Special strings
$strcut = Str_replace (Array ($pre. & '. $end, $pre. ' "'. $end, $pre. ' < '. $end, $pre. ' > '. $end), Array (' & ', ' "'", ' < ', ' > '), $strcut);
Fix a problem with a special string section
$pos = Strrpos ($s, Chr (1));
if ($pos!== false) {
$strcut = substr ($s, 0, $pos);
}
return $strcut. $dot;
}
