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PHP function for checking IMEI

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Luhn algorithm for IMEI Check



public function __checkIMEI($imei){
   if(strlen($imei)==15){
             $imeia=($imei[1]*2);
         if(strlen($imeia)==2){$imeia=str_split($imeia,1);  $imeia=$imeia[0]+$imeia[1]; }
            $imeib=($imei[3]*2);
            if(strlen($imeib)==2){$imeib=str_split($imeib,1); $imeib=$imeib[0]+$imeib[1]; }
            $imeic=($imei[5]*2);
            if(strlen($imeic)==2){$imeic=str_split($imeic,1); $imeic=$imeic[0]+$imeic[1]; }
            $imeid=($imei[7]*2);
            if(strlen($imeid)==2){$imeid=str_split($imeid,1); $imeid=$imeid[0]+$imeid[1];}
            $imeie=($imei[9]*2);
            if(strlen($imeie)==2){$imeie=str_split($imeie,1); $imeie=$imeie[0]+$imeie[1]; }
            $imeif=($imei[11]*2);
            if(strlen($imeif)==2){$imeif=str_split($imeif,1); $imeif=$imeif[0]+$imeif[1]; }
            $imeig=($imei[13]*2);
            if(strlen($imeig)==2){$imeig=str_split($imeig,1); $imeig=$imeig[0]+$imeig[1]; }
     $IMEI=
            ($imei[0]+$imeia+$imei[2]+$imeib+$imei[4]+$imeic+$imei[6]+$imeid+$imei[8]
             +$imeie+$imei[10]+$imeif+$imei[12]+$imeig);
            $IMEI=($IMEI%10);
                if($IMEI!=0){
                   $IMEI=10-$IMEI;
            }
            if($IMEI!=0){
                $IMEI=10-$IMEI;
            }
            if($IMEI==$imei[14]){
                return true;
            }else{
                return true;
            }
        }else{
            return false;
        }
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