PHP chr() ord() Chinese interception garbled code problem solution_PHP tutorial

Copy code The code is as follows:

$lenth = 19;
$str = "How to A long news title only displays the first few words and replaces it with...? ";
echo strlen($str)<=$lenth ? $str : (substr($str,0, $lenth).chr(0)."....");
?>

Copy code Code As follows:

/*
@ Another method, use the ord() function:
@ Applicable to gb2312 encoding:
*/
$str = "How to display only the first few words of a long news title and replace it with...?";
function gb2312_substr($str, $limit) {
$restr = '';
for($i=0;$i< $limit-3;$i++) {
$restr .= ord($str[$i])>127 ? $str[$i ].$str[++$i] : $str[$i];
}
return $restr;
}
/*
@ The following only applies to utf-8 encoding ;
*/
function utf8_substr($str, $limit) {
$restr = '';
for($i=0;$i< $limit-3;$i++) {
$restr .= ord($str[$i])>127 ? $str[$i].$str[++$i].$str[++$i] : $str[$i ];
}
return $restr;
}
//Explain the first one above: chr(0) is not null, null means nothing, and the value of chr(0) is 0. Expressed as hexadecimal, it is 0x00, and expressed as binary, it is 00000000. Although chr(0) will not display anything, it is a character. Although chr(0) does not display anything, it is a character. When a Chinese character is truncated, according to the encoding rules, he always has to pull the other characters behind as Chinese characters for interpretation. This is the reason why garbled characters appear.
?>

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