Here are a couple more uses of ternary operators, ranging from simple to advanced: /* another basic usage */
ALTERNATIVE TO ISSET PHP CODE
Use enough parenthesis to keep your code organized, but not so many that you create "code soup.".If you aren't experienced with using ternary operators, write your code using if/else first, then translate the code into ?'s and :'s.PHP's behaviour when using more than one ternary operator within a single statement is non-obvious." "Is is recommended that you avoid "stacking" ternary expressions. PHP.net recommends avoiding stacking ternary operators.If you work in a team setting, make sure the other programmers understand the code.Don't go more levels deep than what you feel comfortable with maintaining.Here are a few tips for when using "?:" logic: You can do your if/else logic inline with output instead of breaking your output building for if/else statements.Makes coding simple if/else logic quicker.
There are some valuable advantages to using this type of logic:
$var_is_greater_than_two = ($var > 2 ? true : false) // returns true What Are The Advantages of Ternary Logic?
Ternary operator logic is the process of using "(condition) ? (true return value) : (false return value)" statements to shorten your if/else structures. If/Else statements aren't optimal (or necessary) in all situations. I preach a lot about using shorthand CSS and using MooTools to make JavaScript relatively shorthand, so I look towards PHP to do the same. If / Else statements are great but they can be too long. If / Else statements are easy to code and global to all languages. Stick with it though! It might not make sense now but you will have that moment where it all starts to come together.An essential part of programming is evaluating conditions using if/else and switch/case statements. I'm new to answering on the forums so sorry that I didn't include some pictures as reference. If it returns false then it will move down to it's else block and execute the code inside it, which is just echoing out the message that it's an invalid shirt id. 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. 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. 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.
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