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<?php |
<?php |
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function str_length(string $str) : string |
function str_length(string $str) : int |
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{ |
{ |
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$len = strlen($str); |
$len = strlen($str); |
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$ret = 0; |
$ret = 0; |
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|
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// Process UTF-8 Chinese characters |
// Process UTF-8 Chinese characters |
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$v1 = ord($c); |
$v1 = ord($c); |
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if (($v1 & 0b10000000) == 0b10000000) //head of multi-byte character |
if ($v1 & 0x80) //head of multi-byte character |
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{ |
{ |
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$v2 = ($v1 & 0b01111000) << 1; |
$v2 = ($v1 & 0x70) << 1; |
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while ($v2 & 0b10000000) |
while ($v2 & 0x80) |
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{ |
{ |
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$i++; |
$i++; |
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$v3 = $str[$i]; |
$c .= $str[$i]; |
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$c .= $v3; |
$v2 = ($v2 & 0x7f) << 1; |
|
$v2 = ($v2 & 0b01111111 ) << 1; |
|
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} |
} |
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|
|
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$ret += 2; |
$ret += 2; |
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|
|
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// Process UTF-8 Chinese characters |
// Process UTF-8 Chinese characters |
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$v1 = ord($c); |
$v1 = ord($c); |
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if (($v1 & 0b10000000) == 0b10000000) //head of multi-byte character |
if ($v1 & 0x80) //head of multi-byte character |
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{ |
{ |
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$v2 = ($v1 & 0b01111000) << 1; |
$v2 = ($v1 & 0x70) << 1; |
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while ($v2 & 0b10000000) |
while ($v2 & 0x80) |
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{ |
{ |
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$i++; |
$i++; |
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$v3 = $str[$i]; |
$c .= $str[$i]; |
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$c .= $v3; |
$v2 = ($v2 & 0x7f) << 1; |
|
$v2 = ($v2 & 0b01111111 ) << 1; |
|
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} |
} |
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// Each UTF-8 CJK character should use two character length for display |
// Each UTF-8 CJK character should use two character length for display |