Merging form fields before posting

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does know how can merge 3 form fields 1 field before post page?

the first 2 fields drop-down lists , second text field. page posted runs php script uses merged data.

for instance, if dropdown1value = "123" , dropdown2value = "456" , textfieldvalue = "789"
i want them merge value passed php script = "123456789"

i know merged data need stored in hidden field after hours of googling, can't seem find how merge feilds before posted.

i know can sql concat statement not want sata enter database.



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