# 如果在PHP中实现hash算法

• A+

``` > 24); \$hash &= ~\$x; } } return \$hash % 701819; }```

``` function JSHash(\$str) // 0.23 { \$hash = 0; \$n = strlen(\$str); for (\$i = 0; \$i <\$n; \$i++) { \$hash ^= ((\$hash <<5) + ord(\$str[\$i]) + (\$hash>> 2)); } return \$hash % 701819; } function SDBMHash(\$str) // 0.23 { \$hash = 0 ; \$n = strlen(\$str); for (\$i = 0; \$i <\$n; \$i++) { \$hash = ord(\$str[\$i]) + (\$hash <<6 ) + (\$hash <<16 ) - \$hash; } return \$hash % 701819; } function APHash(\$str) // 0.30 { \$hash = 0 ; \$n = strlen(\$str); for (\$i = 0; \$i <\$n; \$i++) { if ((\$i & 1 ) == 0 ) { \$hash ^= ((\$hash <<7 ) ^ ord(\$str[\$i]) ^ (\$hash>> 3 )); } else { \$hash ^= ( ~ ((\$hash <<11 ) ^ ord(\$str[\$i]) ^ (\$hash>> 5))); } } return \$hash % 701819; } function DEKHash(\$str) // 0.23 { \$n = strlen(\$str); \$hash = \$n; for (\$i = 0; \$i <\$n; \$i++) { \$hash = ((\$hash <<5) ^ (\$hash>> 27)) ^ ord(\$str[\$i]); } return \$hash % 701819; } function FNVHash(\$str) // 0.31 { \$hash = 0; \$n = strlen(\$str); for (\$i = 0; \$i <\$n; \$i++) { \$hash *= 0x811C9DC5; \$hash ^= ord(\$str[\$i]); } return \$hash % 701819; } function PJWHash(\$str) // 0.33 { \$hash = \$test = 0; \$n = strlen(\$str); for (\$i = 0; \$i <\$n; \$i++) { \$hash = (\$hash <<4) + ord(\$str[\$i]); if((\$test = \$hash & -268435456) != 0) { \$hash = (( \$hash ^ (\$test>> 24)) & (~-268435456)); } } return \$hash % 701819; } function PHPHash(\$str) // 0.34 { \$hash = 0; \$n = strlen(\$str); for (\$i = 0; \$i <\$n; \$i++) { \$hash = (\$hash <<4) + ord(\$str[\$i]); if ((\$g = (\$hash & 0xF0000000))) { \$hash = \$hash ^ (\$g>> 24); \$hash = \$hash ^ \$g; } } return \$hash % 701819; } ```

```function OpenSSLHash(\$str) // 0.22 { \$hash = 0; \$n = strlen(\$str); for (\$i = 0; \$i <\$n; \$i++) { \$hash ^= (ord(\$str[\$i]) <<(\$i & 0x0f)); } return \$hash % 701819; } function MD5Hash(\$str) // 0.050 { \$hash = md5(\$str); \$hash = \$hash | (\$hash <<8 ) | (\$hash <<16) | (\$hash <<24) | (\$hash <<32) | (\$hash <<40) | (\$hash <<48) | (\$hash <<56); return \$hash % 701819; } ?> ```

• A+ ## 目前评论：5   其中：访客  5   博主  0

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