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php 32λÕûÊýÒç³öÎÊÌâ - PHP / »ù´¡±à³Ì

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C/C++ code:

static unsigned long
hash_string (const void *key)
{
const char *p = (const char *)key;
unsigned int h = *p;

if (h)
for (p += 1; *p != '\0'; p++)
h = (h << 5) - h + *p;

return h;
}



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PHP code:

function hash_string($str)
{
$length = strlen($str);
$h = ord($str[0]);
if($length > 0)
for($i = 1; $i < $length; ++$i)
{
$h = [color=#FF0000]($h << 5)[/color] - $h + ord($str[$i]);
}
return sprintf("%u", $h);
}



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int ÊÇ4×Ö½ÚµÄ.

$h = (($h << 5) & 0xffffffff) - $h + ord($str[$i]);
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