PHP CRC16 校驗碼的算法如何使用
最近用到CRC16，

我現在就是要把 010301180001 算出CRC16的校驗碼，通過其他工具，可以得到 校驗碼是 05F1

最后完整的代碼就是 01030118000105F1



我現在需要用php程序，寫個函數，來計算這個 05F1 , 網上很難找到 php語言中的CRC16 應用實例，昨晚發現php.net官方有這樣一個介紹。
http://cn.php.net/manual/en/function.crc32.php

I made this code to verify Transmition with Vantage Pro2 ( weather station ) based on CRC16-CCITT standard.<?php // CRC16-CCITT validator $crc_table = array(0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0);$test = chr(0xC6).chr(0xCE).chr(0xA2).chr(0x03); // CRC16-CCITT = 0xE2B4genCRC ($test);function genCRC (&$ptr) {$crc = 0x0000;$crc_table = $GLOBALS['crc_table'];for ($i = 0; $i < strlen($ptr); $i++)$crc = $crc_table[(($crc>>8) ^ ord($ptr[$i]))] ^ (($crc<<8) & 0x00FFFF);return $crc; } ?> 第二種（測試就是用這種） <?php function?crc16($string)?{ ??$crc?=?0xFFFF; ??for?($x?=?0;?$x?<?strlen?($string);?$x++)?{ ????$crc?=?$crc?^?ord($string[$x]); ????for?($y?=?0;?$y?<?8;?$y++)?{ ??????if?(($crc?&?0x0001)?==?0x0001)?{ ????????$crc?=?(($crc?>>?1)?^?0xA001); ??????}?else?{?$crc?=?$crc?>>?1;?} ????} ??} ??return?$crc; } ?>

以上的官方的例子， 我怎么把 010301180001 替換到$test里去， 到底是要先轉成什么？

請高手幫我把這個 010301180001 應用一下，怎么得出 05F1?

謝謝！


第三種

PHP code?

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MODBUS?RTU,?CRC16, input->?modbus?rtu?string output?->?2bytes?string,?in?correct?modbus?order <?php function?crc16($string,$length=0){ ????$auchCRCHi=array(????0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81, ????????????????0x40,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0, ????????????????0x80,?0x41,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81,?0x40,?0x01, ????????????????0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x01,?0xC0,?0x80,?0x41, ????????????????0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81, ????????????????0x40,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x01,?0xC0, ????????????????0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x01, ????????????????0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40, ????????????????0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81, ????????????????0x40,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0, ????????????????0x80,?0x41,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81,?0x40,?0x01, ????????????????0xC0,?0x80,?0x41,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41, ????????????????0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81, ????????????????0x40,?0x01,?0xC0,?0x80,?0x41,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0, ????????????????0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x01, ????????????????0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81,?0x40,?0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41, ????????????????0x00,?0xC1,?0x81,?0x40,?0x01,?0xC0,?0x80,?0x41,?0x01,?0xC0,?0x80,?0x41,?0x00,?0xC1,?0x81, ????????????????0x40); ????$auchCRCLo=array(????0x00,?0xC0,?0xC1,?0x01,?0xC3,?0x03,?0x02,?0xC2,?0xC6,?0x06,?0x07,?0xC7,?0x05,?0xC5,?0xC4, ????????????????0x04,?0xCC,?0x0C,?0x0D,?0xCD,?0x0F,?0xCF,?0xCE,?0x0E,?0x0A,?0xCA,?0xCB,?0x0B,?0xC9,?0x09, ????????????????0x08,?0xC8,?0xD8,?0x18,?0x19,?0xD9,?0x1B,?0xDB,?0xDA,?0x1A,?0x1E,?0xDE,?0xDF,?0x1F,?0xDD, ????????????????0x1D,?0x1C,?0xDC,?0x14,?0xD4,?0xD5,?0x15,?0xD7,?0x17,?0x16,?0xD6,?0xD2,?0x12,?0x13,?0xD3, ????????????????0x11,?0xD1,?0xD0,?0x10,?0xF0,?0x30,?0x31,?0xF1,?0x33,?0xF3,?0xF2,?0x32,?0x36,?0xF6,?0xF7, ????????????????0x37,?0xF5,?0x35,?0x34,?0xF4,?0x3C,?0xFC,?0xFD,?0x3D,?0xFF,?0x3F,?0x3E,?0xFE,?0xFA,?0x3A, ????????????????0x3B,?0xFB,?0x39,?0xF9,?0xF8,?0x38,?0x28,?0xE8,?0xE9,?0x29,?0xEB,?0x2B,?0x2A,?0xEA,?0xEE, ????????????????0x2E,?0x2F,?0xEF,?0x2D,?0xED,?0xEC,?0x2C,?0xE4,?0x24,?0x25,?0xE5,?0x27,?0xE7,?0xE6,?0x26, ????????????????0x22,?0xE2,?0xE3,?0x23,?0xE1,?0x21,?0x20,?0xE0,?0xA0,?0x60,?0x61,?0xA1,?0x63,?0xA3,?0xA2, ????????????????0x62,?0x66,?0xA6,?0xA7,?0x67,?0xA5,?0x65,?0x64,?0xA4,?0x6C,?0xAC,?0xAD,?0x6D,?0xAF,?0x6F, ????????????????0x6E,?0xAE,?0xAA,?0x6A,?0x6B,?0xAB,?0x69,?0xA9,?0xA8,?0x68,?0x78,?0xB8,?0xB9,?0x79,?0xBB, ????????????????0x7B,?0x7A,?0xBA,?0xBE,?0x7E,?0x7F,?0xBF,?0x7D,?0xBD,?0xBC,?0x7C,?0xB4,?0x74,?0x75,?0xB5, ????????????????0x77,?0xB7,?0xB6,?0x76,?0x72,?0xB2,?0xB3,?0x73,?0xB1,?0x71,?0x70,?0xB0,?0x50,?0x90,?0x91, ????????????????0x51,?0x93,?0x53,?0x52,?0x92,?0x96,?0x56,?0x57,?0x97,?0x55,?0x95,?0x94,?0x54,?0x9C,?0x5C, ????????????????0x5D,?0x9D,?0x5F,?0x9F,?0x9E,?0x5E,?0x5A,?0x9A,?0x9B,?0x5B,?0x99,?0x59,?0x58,?0x98,?0x88, ????????????????0x48,?0x49,?0x89,?0x4B,?0x8B,?0x8A,?0x4A,?0x4E,?0x8E,?0x8F,?0x4F,?0x8D,?0x4D,?0x4C,?0x8C, ????????????????0x44,?0x84,?0x85,?0x45,?0x87,?0x47,?0x46,?0x86,?0x82,?0x42,?0x43,?0x83,?0x41,?0x81,?0x80, ????????????????0x40); ????$length????????=($length<=0?strlen($string):$length); ????$uchCRCHi????=0xFF; ????$uchCRCLo????=0xFF; ????$uIndex????????=0; ????for?($i=0;$i<$length;$i++){ ????????$uIndex????????=$uchCRCLo?^?ord(substr($string,$i,1)); ????????$uchCRCLo????=$uchCRCHi?^?$auchCRCHi[$uIndex]; ????????$uchCRCHi????=$auchCRCLo[$uIndex]?; ????} ????return(chr($uchCRCLo).chr($uchCRCHi)); } ?> 一共有3種，到底是那種呢？ 如何應用？

------解決方案--------------------
經測試，#1 的代碼符合你的要求

測試代碼PHP code

$s = pack('H*', '010301180001'); $t = crc16(s); printf('=%02x%02x', $t%256, floor($t/256));

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