Código PHP:
$cs1="SELECT * FROM envios WHERE idenvios='correos'";
$rs1=mysql_query($cs1);
$dt1=mysql_fetch_row($rs1);
$cs2="SELECT * FROM envios WHERE idenvios='correos2'";
$rs2=mysql_query($cs2);
$dt2=mysql_fetch_row($rs2);
$cs3="SELECT * FROM envios WHERE idenvios='DHL'";
$rs3=mysql_query($cs3);
$dt3=mysql_fetch_row($rs3);
$cs4="SELECT * FROM envios WHERE idenvios='DHL2'";
$rs4=mysql_query($cs4);
$dt4=mysql_fetch_row($rs4);
$cs5="SELECT * FROM envios WHERE idenvios='DHL3'";
$rs5=mysql_query($cs5);
$dt5=mysql_fetch_row($rs5);
$cs6="SELECT * FROM envios WHERE idenvios='europa'";
$rs6=mysql_query($cs6);
$dt6=mysql_fetch_row($rs6);
$cs7="SELECT * FROM envios WHERE idenvios='america'";
$rs7=mysql_query($cs7);
$dt7=mysql_fetch_row($rs7);
$cs8="SELECT * FROM envios WHERE idenvios='asia'";
$rs8=mysql_query($cs8);
$dt8=mysql_fetch_row($rs8);
if ($datuak[14]=='españa')
{
if($suma<=50)
{ if ($datuak[12]=='correos')
{$dn=$dt1[1];}
elseif ($datuak[12]=='DHL')
{$dn=$dt3[1];}
}
elseif($suma<=120)
{ if ($datuak[12]=='correos')
{$dn=0;}
elseif ($datuak[12]=='DHL')
{$dn=$dt4[1];}
}
elseif($suma>=120)
{ if ($datuak[12]=='correos')
{$dn=0;}
elseif ($datuak[12]=='DHL')
{$dn=0;}
}
else{$dn=0;}
if ($datuak[11]=contra reenbolso)
{ if (datuak[12]='correos')
{$dn2=$dt2[1];}
else {$dn2=+($suma*dt5[1]);}
}
else {$dn2=0;}
}
elseif ($datuak[14]=='europa')
{$dn= $dt3[1];}
elseif ($datuak[14]=='america')
{$dn= $date1[1];}
else{$dn= $dt4[1];}