php - Check if information from database is blank -

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i need check if status , b blank or 0, blank doesnt work, suggestions?

 $sta = db2_result($queryexe, 'statusa');  $stb = db2_result($queryexe, 'statusb');    if ($sta=="0" or $sta=="" , $stb=="0" or $stb=="")

you should use empty function consider 0, "0", null... empty values :

if (empty($sta) && empty($stb)) {

if want stick logic, consider separate if statements in 2 parts :

if (     ($sta=="0" or $sta=="")     ,     ($stb=="0" or $stb=="") ) {

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