PHP string hashcode (including Chinese)

Full-width characters converted to half-width characters

function REPLACE_DBC2SBC ($STR) {

$DBC = Array (

' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ',

' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ',

' A ', ' B ', ' C ', ' d ', ' e ',

' F ', ' g ', ' h ', ' I ', ' J ',

' K ', ' l ', ' m ', ' n ', ' O ',

' P ', ' Q ', ' R ', ' s ', ' t ',

' U ', ' V ', ' w ', ' x ', ' Y ',

' Z ', ' a ', ' B ', ' C ', ' d ',

' E ', ' f ', ' g ', ' h ', ' I ',

' J ', ' K ', ' l ', ' m ', ' n ',

' O ', ' P ', ' Q ', ' R ', ' s ',

' t ', ' u ', ' V ', ' w ', ' X ',

' Y ', ' z ', '-', ', ': ',

'． ' , '，' , '／' , '％' , '＃' ,

'！ ' , '＠' , '＆' , '（' , '）' ,

' ' ', ' ', ' ' ', ', ', '? ' ,

'［' , '］' , '｛' , '｝' , '＼' ,

' | ', ' + ', ' = ', ' _ ', ' ^ ',

' ￥ ', ' ￣ ', ' '

);

$SBC = Array (//Half Corner

' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ',

' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ',

' A ', ' B ', ' C ', ' D ', ' E ',

' F ', ' G ', ' H ', ' I ', ' J ',

' K ', ' L ', ' M ', ' N ', ' O ',

' P ', ' Q ', ' R ', ' S ', ' T ',

' U ', ' V ', ' W ', ' X ', ' Y ',

' Z ', ' A ', ' B ', ' C ', ' d ',

' E ', ' f ', ' g ', ' h ', ' I ',

' J ', ' K ', ' l ', ' m ', ' n ',

' O ', ' P ', ' Q ', ' R ', ' s ',

' t ', ' u ', ' V ', ' w ', ' X ',

' Y ', ' z ', '-', ', ': ',

'.', ',', '/', '%', '#',

'! ', ' @ ', ' & ', ' (', ') ',

' < ', ' > ', ' ' ', ' \ ', '? ',

'[', ']', '{', '}', '\\',

'|', '+', '=', '_', '^',

'$', '~', '`'

);

Return Str_replace ($DBC, $SBC, $STR); Full angle to half angle

}

Convert character to ASCII code

function Asc_encode ($c)

{

$len = strlen ($c);

$a = 0;

while ($a < $len)

{

$ud = 0;

if (Ord ($c {$a}) >=0 && ord ($c {$a}) <=127)

{

$ud = Ord ($c {$a});

$a + = 1;

}

else if (Ord ($c {$a}) >=192 && ord ($c {$a}) <=223)

{

$ud = (Ord ($c {$a}) -192) *64 + (ord ($c {$a +1})-128);

$a + = 2;

}

else if (Ord ($c {$a}) >=224 && ord ($c {$a}) <=239)

{

$ud = (Ord ($c {$a}) -224) *4096 + (ord ($c {$a +1}) -128) *64 + (ord ($c {$a +2})-128);

$a + = 3;

}

else if (Ord ($c {$a}) >=240 && ord ($c {$a}) <=247)

{

$ud = (Ord ($c {$a}) -240) *262144 + (ord ($c {$a +1}) -128) *4096 + (ord ($c {$a +2}) -128) *64 + (ord ($c {$a +3})-128);

$a + = 4;

}

else if (Ord ($c {$a}) >=248 && ord ($c {$a}) <=251)

{

$ud = (Ord ($c {$a}) -248) *16777216 + (ord ($c {$a +1}) -128) *262144 + (ord ($c {$a +2}) -128) *4096 + (ord ($c {$a +3}) -128) *64 + (ord ($c {$a +4})-128);

$a + = 5;

}

else if (Ord ($c {$a}) >=252 && ord ($c {$a}) <=253)

{

$ud = (Ord ($c {$a}) -252) *1073741824 + (ord ($c {$a +1}) -128) *16777216 + (ord ($c {$a +2}) -128) *262144 + (ord ($c {$a +3})-128) * 4096 + (Ord ($c {$a +4}) -128) *64 + (ord ($c {$a +5})-128);

$a + = 6;

}

else if (Ord ($c {$a}) >=254 && ord ($c {$a}) <=255)

{//error

$ud = 0;

$a + +;

}else{

$ud = 0;

$a + +;

}

$scill. = "$ud";

}

return $scill;

}

Convert a string into hashcode

function Hashcode ($s) {

$arr _str = Str_split ($s);

$len = count ($arr _str);

$hash = 0;

for ($i =0; $i < $len; $i + +) {

if (Ord ($arr _str[$i]) >127) {

$ac _str = $arr _str[$i]. $arr _str[$i +1]. $arr _str[$i +2];

$i +=2;

}else{

$ac _str = $arr _str[$i];

}

$hash = (int) ($hash *31 + asc_encode ($ac _str));

64bit judging the symbol bit

if (($hash & 0x80000000) = = 0) {

Positive number takes the first 31 digits

$hash &= 0x7fffffff;

}

else{

Negative numbers take the first 31 digits to be converted according to the minimum negative value

$hash = ($hash & 0x7fffffff)-2147483648;

}

}

return $hash;

}

The above describes the PHP string to hashcode (including Chinese), including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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