[SOLVED] Determining if a variable is missing and setting a new variable...

[jaxdevil]

I have a form that posts data and some of the form fields are empty and some are not, depending on the usage at the time, so I need to be able to start numbering new lines based on the last line used, so I am trying to set a variable called $x_factor to whatever number is the first on that is NOT sent with the form. Anyone see what I am doing wrong?

 

    if(empty($model_number_1)): $x_factor='1';
    elseif(empty($model_number_2)): $x_factor='2';
    elseif(empty($model_number_3)): $x_factor='3';
    elseif(empty($model_number_4)): $x_factor='4';
    elseif(empty($model_number_5)): $x_factor='5';
    elseif(empty($model_number_6)): $x_factor='6';
    elseif(empty($model_number_7)): $x_factor='7';
    elseif(empty($model_number_): $x_factor='8';
    elseif(empty($model_number_9)): $x_factor='9';
    elseif(empty($model_number_10)): $x_factor='10';
    elseif(empty($model_number_11)): $x_factor='11';
    elseif(empty($model_number_12)): $x_factor='12';
    elseif(empty($model_number_13)): $x_factor='13';
    elseif(empty($model_number_14)): $x_factor='14';
    elseif(empty($model_number_15)): $x_factor='15';
    elseif(empty($model_number_16)): $x_factor='16';
    elseif(empty($model_number_17)): $x_factor='17';
    elseif(empty($model_number_18)): $x_factor='18';
    elseif(empty($model_number_19)): $x_factor='19';
    elseif(empty($model_number_20)): $x_factor='20';
    elseif(empty($model_number_21)): $x_factor='21';
    elseif(empty($model_number_22)): $x_factor='22';
    elseif(empty($model_number_23)): $x_factor='23';
    elseif(empty($model_number_24)): $x_factor='24';
    elseif(empty($model_number_25)): $x_factor='25';
    elseif(empty($model_number_26)): $x_factor='26';
    elseif(empty($model_number_27)): $x_factor='27';
    elseif(empty($model_number_28)): $x_factor='28';
    elseif(empty($model_number_29)): $x_factor='29';
    elseif(empty($model_number_30)): $x_factor='30';
    elseif(empty($model_number_31)): $x_factor='31';
    elseif(empty($model_number_32)): $x_factor='32';
    elseif(empty($model_number_33)): $x_factor='33';
    elseif(empty($model_number_34)): $x_factor='34';
    elseif(empty($model_number_35)): $x_factor='35';
    elseif(empty($model_number_36)): $x_factor='36';
    elseif(empty($model_number_37)): $x_factor='37';
    elseif(empty($model_number_38)): $x_factor='38';
    elseif(empty($model_number_39)): $x_factor='39';
    elseif(empty($model_number_40)): $x_factor='40';
else: $x_factor='666';

[jaxdevil]

I figured it out..

 

    if(empty($model_number_1)) {$x_factor='1';}
    elseif(empty($model_number_2)) { $x_factor='2';}
    elseif(empty($model_number_3)) { $x_factor='3';}
    elseif(empty($model_number_4)) { $x_factor='4';}
    elseif(empty($model_number_5)) { $x_factor='5';}
    elseif(empty($model_number_6)) { $x_factor='6';}
    elseif(empty($model_number_7)) { $x_factor='7';}
    elseif(empty($model_number_) { $x_factor='8';}
    elseif(empty($model_number_9)) { $x_factor='9';}
    elseif(empty($model_number_10)) { $x_factor='10';}
    elseif(empty($model_number_11)) { $x_factor='11';}
    elseif(empty($model_number_12)) { $x_factor='12';}
    elseif(empty($model_number_13)) { $x_factor='13';}
    elseif(empty($model_number_14)) { $x_factor='14';}
    elseif(empty($model_number_15)) { $x_factor='15';}
    elseif(empty($model_number_16)) { $x_factor='16';}
    elseif(empty($model_number_17)) { $x_factor='17';}
    elseif(empty($model_number_18)) { $x_factor='18';}
    elseif(empty($model_number_19)) { $x_factor='19';}
    elseif(empty($model_number_20)) { $x_factor='20';}
    elseif(empty($model_number_21)) { $x_factor='21';}
    elseif(empty($model_number_22)) { $x_factor='22';}
    elseif(empty($model_number_23)) { $x_factor='23';}
    elseif(empty($model_number_24)) { $x_factor='24';}
    elseif(empty($model_number_25)) { $x_factor='25';}
    elseif(empty($model_number_26)) { $x_factor='26';}
    elseif(empty($model_number_27)) { $x_factor='27';}
    elseif(empty($model_number_28)) { $x_factor='28';}
    elseif(empty($model_number_29)) { $x_factor='29';}
    elseif(empty($model_number_30)) { $x_factor='30';}
    elseif(empty($model_number_31)) { $x_factor='31';}
    elseif(empty($model_number_32)) { $x_factor='32';}
    elseif(empty($model_number_33)) { $x_factor='33';}
    elseif(empty($model_number_34)) { $x_factor='34';}
    elseif(empty($model_number_35)) { $x_factor='35';}
    elseif(empty($model_number_36)) { $x_factor='36';}
    elseif(empty($model_number_37)) { $x_factor='37';}
    elseif(empty($model_number_38)) { $x_factor='38';}
    elseif(empty($model_number_39)) { $x_factor='39';}
    elseif(empty($model_number_40)) { $x_factor='40';}
else { $x_factor="666";}