# Determine whether IMEI or meId is valid

Source: Internet
Author: User

/*-----------------------------------------------
* Determines whether the IMEI or meid represented by this string is legal
* @ Param IMEI
* @ Author helin 2014-08-21 add
* @ Return boolen
* IMEI verification code algorithm:
* (1). multiply the number of even digits by 2 to calculate the sum of single digits and ten digits respectively.
* (2) Add the odd digit number and the value calculated in the previous step.
* (3). If the number of digits obtained is 0, the check digit is 0. Otherwise, the value is 10 minus the single digit.
* For example: 35 89 01 80 69 72 41 even digits multiply by 2 get 5*2 = 10 9*2 = 18 1*2 = 02 0*2 = 00 9*2 = 18 2*2 = 04 1*2 = 02, calculate the sum of odd digits and even digits. 3 + (1 + 0) + 8 + (1 + 8) + 0 + (0 + 2) + 8 + (0 + 0) + 6 + (1 + 8) + 7 + (0 + 4) + 4 + (0 + 2) = 63 => check bits 10-3 = 7
-----------------------------------------------*/

`Function is_imei (\$ IMEI = '') {If (! \$ IMEI) {return false ;}\$ imeilen = strlen (\$ IMEI); \$ deorhex = 10; // initialization. Assume that this string is IMEI :: pure numeric for (\$ J = 0; \$ j <\$ imeilen; \$ J ++) {\$ c = \$ IMEI [\$ J]; If (is_numeric (\$ C )) {continue;} else if (\$ C >='a' & \$ C <= 'F ') | (\$ C> = 'A' & \$ C <= 'F') {\$ deorhex = 16 ;} else {// If any character other than the number or hexadecimal number is displayed, return false if it is invalid.} if (\$ deorhex = 10 & \$ imeilen! = 15) {// All numbers (IMEI), and the length is not 15 return false;} if (\$ deorhex = 16) {// contains valid hexadecimal number (meid) if (\$ imeilen = 14) {// new rule, 14-bit meid, which is directly legal without verifying return true ;} if (\$ imeilen! = 14 & \$ imeilen! = 15) {return false; // If the meid length is not 14 or 15, it is determined that it is invalid without verification.} \$ COUNT = 0; For (\$ I = 0; \$ I <7; \$ I ++) {\$ tmp1 = hexdec (\$ IMEI [\$ I * 2]); // if it is a hexadecimal character, convert to 10: hexdec ('A') = 10; \$ tmp2 = hexdec (\$ IMEI [\$ I * 2 + 1]) * 2; \$ count + = \$ tmp1 + floor (\$ tmp2/\$ deorhex) + \$ tmp2 % \$ deorhex;} \$ endint = \$ count % \$ deorhex; // The last digit of the number \$ paritybit = \$ endint> 0? \$ Deorhex-\$ endint: 0; // check bit return \$ paritybit = hexdec (\$ IMEI [14]);} \$ IMEI = 'a0000020.d46cd'; // '123 '; echo is_imei (\$ IMEI )? 1:0; echo '<HR> ';`

Determine whether IMEI or meId is valid

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