php - how to unset query variable -

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in order fetch data database (mysql) appending query depending upon user requirement chooses filters i've given him. @ specific point if condition met, want unset field (submissiondate) set variable before , set new field variable. e.g query is:

$query = "select * table2 date(submissiondate) between '$variablename3' ,  '$variablename4'"

but if following condition true: 

if($variablename8=="approved")

so have append previous query , add 

$query = "$query , date(newdate) between '$variablename3' ,  '$variablename4'"

note appending depending upon conditions met. can't write query again . different fields set different values if condition met have unset submissiondate , set newdate field b/w var3 , var4 , unset previous part was:

date(submissiondate) between '$variablename3' ,  '$variablename4'

so have neglect submissiondate effect while remain in query. there possible way sort type of problem out ?

please try make query variable conditional.

$query = "select * table2 1=1 , ";  if($variablename8=="approved") $query .= "date(newdate) between '$variablename3' ,  '$variablename4'"; else $query .= "date(submissiondate) between '$variablename3' ,  '$variablename4'";

or looking else?


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