//全角字符转变成半角字符
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’ , ‘－’ , ‘ ’ , ‘：’ ,
‘．’ , ‘，’ , ‘／’ , ‘％’ , ‘＃’ ,
‘！’ , ‘＠’ , ‘＆’ , ‘（’ , ‘）’ ,
‘＜’ , ‘＞’ , ‘＂’ , ‘＇’ , ‘？’ ,
‘［’ , ‘］’ , ‘｛’ , ‘｝’ , ‘＼’ ,
‘｜’ , ‘＋’ , ‘＝’ , ‘＿’ , ‘＾’ ,
‘￥’ , ‘￣’ , ‘｀’
);
$SBC = Array( // 半角
‘0’, ‘1’, ‘2’, ‘3’, ‘4’,
‘5’, ‘6’, ‘7’, ‘8’, ‘9’,
‘A’, ‘B’, ‘C’, ‘D’, ‘E’,
‘F’, ‘G’, ‘H’, ‘I’, ‘J’,
‘K’, ‘L’, ‘M’, ‘N’, ‘O’,
‘P’, ‘Q’, ‘R’, ‘S’, ‘T’,
‘U’, ‘V’, ‘W’, ‘X’, ‘Y’,
‘Z’, ‘a’, ‘b’, ‘c’, ‘d’,
‘e’, ‘f’, ‘g’, ‘h’, ‘i’,
‘j’, ‘k’, ‘l’, ‘m’, ‘n’,
‘o’, ‘p’, ‘q’, ‘r’, ‘s’,
‘t’, ‘u’, ‘v’, ‘w’, ‘x’,
‘y’, ‘z’, ‘-‘, ‘ ‘, ‘:’,
‘.’, ‘,’, ‘/’, ‘%’, ‘#’,
‘!’, ‘@’, ‘&’, ‘(‘, ‘)’,
”, ‘”‘, ‘\”,’?’,
‘[‘, ‘]’, ‘{‘, ‘}’, ‘\\’,
‘|’, ‘+’, ‘=’, ‘_’, ‘^’,
‘$’, ‘~’, ‘`’
);
return str_replace($DBC, $SBC, $str); // 全角到半角
}
//字符转换为ascii码
function asc_encode($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{$a+3})-128)*409*本文来@源gao@daima#com搞(%代@#码@网2
搞代gaodaima码
6 + (ord($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 $scill;
}
//将字符串转变成hashcode
function hashCode($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($ac_str));
//64bit下判断符号位
if(($hash & 0x80000000) == 0) {
//正数取前31位即可
$hash &= 0x7fffffff;
}
else{
//负数取前31位后要根据最小负数值转换下
$hash = ($hash & 0x7fffffff) – 2147483648;
}
}
return $hash;
}
以上就介绍了php 字符串转hashcode（包括中文），包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
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