Assign a custom post to a custom taxonomy based on custom field value

Question

This answer does exactly what I needed to do, but the only thing is I need it to select more than just one category.

So I have changed the code to work based on salary so salary gets entered into a custom field, then it automatically selects the salary banding category which works fine, but now I have a salary from and a salary to custom field so I have a value of salary to, so how can I get the code to add the post to mulitiple categories based on both values if that makes any sense?

Below is my code that works for the category selection based on the value of salaryband, so I need it to also select the category based on salaryband2 (custom field)

function add_my_taxonomy($post_ID) {
    $salary = array(
'1015' => '10 - 15 ph',
'100140' => '100K - 140K',
'101120' => '101K - 120K pa',
'121150' => '121K – 150K pa',
'151170' => '151K – 170K pa',
'171200' => '171K – 200K pa',
'2025' => '20 – 25 ph',
'2025k' => '20K – 25K pa',
'2630' => '26 – 30 ph',
'2630k' => '26K – 30K pa',
'3040' => '30 – 40 ph',
'3140k' => '31K – 40K pa',
'4150' => '41K – 50K pa',
'5160' => '51K – 60K pa',
'6170' => '61K – 70K pa',
'7180' => '71K – 80K pa',
'8190' => '81K – 90K pa',
'91100' => '91K – 100K pa'
    );
    $zip = array(
'1015' => '10, 11, 12, 13, 14, 15,',
'100140' => '101000, 102000, 103000, 104000, 105000, 106000, 107000, 108000, 109000, 110000, 111000, 112000, 113000, 114000, 115000, 116000, 117000, 118000, 119000, 120000, 121000, 122000, 123000, 124000, 125000, 126000, 127000, 128000, 129000, 130000, 131000, 132000, 133000, 134000, 135000, 136000, 137000, 138000, 139000, 140000,',
'101120' => '101000, 102000, 103000, 104000, 105000, 106000, 107000, 108000, 109000, 110000, 111000, 112000, 113000, 114000, 115000, 116000, 117000, 118000, 119000, 120000,',
'121150' => '121000, 122000, 123000, 124000, 125000, 126000, 127000, 128000, 129000, 130000, 131000, 132000, 133000, 134000, 135000, 136000, 137000, 138000, 139000, 140000, 141000, 142000, 143000, 144000, 145000, 146000, 147000, 148000, 149000, 150000,',
'151170' => '151000, 152000, 153000, 154000, 155000, 156000, 157000, 158000, 159000, 160000, 161000, 162000, 163000, 164000, 165000, 166000, 167000, 168000, 169000, 170000,',
'171200' => '171000, 172000, 173000, 174000, 175000, 176000, 177000, 178000, 179000, 180000, 181000, 182000, 183000, 184000, 185000, 186000, 187000, 188000, 189000, 190000, 191000, 192000, 193000, 194000, 195000, 196000, 197000, 198000, 199000, 200000,',
'2025' => '20, 21, 22, 23, 24, 25,',
'2630' => '26, 27, 28, 29, 30,',
'2025k' => '20000, 21000, 22000, 23000, 24000, 25000,',
'2630k' => '26000, 27000, 28000, 29000, 30000,',
'3040' => '31, 32, 33, 34, 35, 36, 37, 38, 39, 40,',
'2630k' => '26000, 27000, 28000, 29000, 30000,',
'3140k' => '31000, 32000, 33000, 34000, 35000, 36000, 37000, 38000, 39000, 40000,',
'4150' => '41000, 42000, 43000, 44000, 45000, 46000, 47000, 48000, 49000, 50000,',
'5160' => '51000, 52000, 53000, 54000, 55000, 56000, 57000, 58000, 59000, 60000,',
'6170' => '61000, 62000, 63000, 64000, 65000, 66000, 67000, 68000, 69000, 70000,',
'7180' => '71000, 72000, 73000, 74000, 75000, 76000, 77000, 78000, 79000, 80000,',
'8190' => '81000, 82000, 83000, 84000, 85000, 86000, 87000, 88000, 89000, 90000,',
'91100' => '91000, 92000, 93000, 94000, 95000, 96000, 97000, 98000, 99000, 100000,'
    );
    foreach ($zip as $code => $salaryband){
        $salaryband = explode(',', $salaryband);
        $customField = get_post_meta($post_ID,'salaryband',true);
        if (in_array($customField,$salaryband)){
            wp_set_object_terms( $post_ID, $salary[$code], 'salary' );
        }
    } 

Answer 1

Hi thanks this is solved now i got help from a developer i know he fixed for me basically wp_set_object_terms() has a fourth argument called append. Setting that to true during the call should add the term without unsetting the already set terms.

so thats if anyone else has this issue thanks again to all that have commented thanks