Same thing applies to the second if statement. If it returns false it then moves to the else block of the first if statement and then echos out the message that there is no shirt id. So in the first if statement it would check to see if there was even an id to begin with. The else statements would be triggered if the if isset function returned false rather then true. After that it will then echo out a message saying that it's a valid shirt id. If that is set and returns true just like in the previous if statement, it will assign the product id of the products array to a variable called $product. Then it checks to see if the products id of the products array is set. After it has done that it continues down the script to the next if statement. If it returns true and it is indeed set then it assigns the id to the $product_id variable.
#ALTERNATIVE TO ISSET PHP CODE#
In the first part of the block of code it's getting the id. Basically it will return true if the variable exists. If the variable is set to something other then null or false then it will return true. So the isset function checks wether the variable is set or null. Basically where you think that you have a variable that is (1) hard to remember, (2) long to type out, or (3) will be frequently used. Use it where you feel it's necessary to use a local variable. This practise is almost always just to make your life easier, and doesn't have an impact on the actual program. There is absolutely nothing wrong with using $products if you'd prefer, but it's both easier to type and remember and less likely to miss-type if you use a shorter variable of your choice. Same thing goes for $product = $products. But I think that increases the chances of error. If you don't feel comfortable doing it this way, or if you feel it's redundant, then that's perfectly fine and acceptable too.
It makes it easier to read and easier to see the known's and unknown's of the problem and thus easier to solve it if everything is written down in one place rather than having the mess of papers laying everywhere. I think of it as the same reason you would want to first copy a math problem onto your sheet in a test before solving it. well it's just "cleaner" for you as a programmer to just use a local variable. You can still use logical operators as conditionals, but only for executing logic, not for getting a value back, e.g.Yes you can use $_GET if you'd like - there is nothing wrong about that.īut I'd say it's a good practise not to use it though because. In ruby, this would be 4, but in PHP, this would be true (type-juggled equivalent is 1), which isn't useful for anything but further binary logic. ruby) are much better suited to this approach, as the expression evaluated will be the resultant value, e.g.: The reason temec987's approach of using boolean operators as an alternative to control structures won't work for an 'echo' is because the result of evaluating the expression will always be a boolean.
#ALTERNATIVE TO ISSET PHP ARCHIVE#
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