I setup up a few functions that I can use across the site. I have a few of these custom php functions simply stored in my includes.php and I call them when needed. A few people in other forums online cautioned against using global too often as it could unintentionally affect other parts of a larger program. My examples seem fairly simple and wondering what your thoughts are from the developers perspective on using this method - or if you have suggestions on a better way to accomplish the same thing. These all work for my purpose, so my question isn't about it working - its more about best practice. Im not a developer by any stretch and sometimes I wonder if I know just enough php to possibly mess something up :)...or if what is in my examples is harmless.
This one for example, is a stripped down version of the mini-cart that just pulls the product ids for items that are in the cart. So that I can then run conditionals and have content appear based on if a pId is in the array:
function cartprodids() {
global $thesessionid;
$sSQL = 'SELECT cartProdID FROM cart WHERE cartCompleted=0 AND ' . getsessionsql();
$result=ect_query($sSQL) or ect_error();
while($rs=ect_fetch_assoc($result)){
$array[]=$rs['cartProdID'];
}
ect_free_result($result);
return $array;
}
This one gets the number of items in the cart. Using this to populate the number of cart items next to the cart link...
function cartquantity() {
global $thesessionid;
if(trim(@$_POST['sessionid'])!='')
$thesessionid = trim(@$_POST['sessionid']);
else
$thesessionid = getsessionid();
$totquant=0;
$sSQL = 'SELECT cartID,cartProdID,cartProdName,cartProdPrice,cartQuantity FROM cart WHERE cartCompleted=0 AND ' . getsessionsql();
$result=ect_query($sSQL) or ect_error();
while($rs=ect_fetch_assoc($result)){
$optPriceDiff=0;
$mcpdtxt.='<div class="minicartcnt">' . $rs['cartQuantity'] . ' ' . $rs['cartProdName'] . '</div>';
$sSQL = 'SELECT SUM(coPriceDiff) AS sumDiff FROM cartoptions WHERE coCartID=' . $rs['cartID'];
$result2=ect_query($sSQL) or ect_error();
$rs2=ect_fetch_assoc($result2);
if(! is_null($rs2['sumDiff'])) $optPriceDiff=$rs2['sumDiff'];
ect_free_result($result2);
$subtot = (($rs['cartProdPrice']+$optPriceDiff)*(int)$rs['cartQuantity']);
$totquant+=(int)$rs['cartQuantity'];
$mcgndtot+=$subtot;
}
return $totquant;
}
This one I am using in conjunction with a modification to the incproductbody2 page to add the prodid and category as css classes for styling purposes. To have a little more granular control over the CSS of each item on the products page...
function addcss2products(){
global $rs;
$productpID=$rs['pId'];
$productcat=$rs['pSection'];
return $productpID." cat-".$productcat;
}
Pretty straigt forward. Returns the pSection...
function productspSection(){
global $rs;
return $rs['pSection'];
}
using global in custom php functions
Posted - 02/28/2018 : 02:41:54
