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lucho
Asked: 2020-06-14 12:41:37 +0800 CST 2020-06-14 12:41:37 +0800 CST

What does this piece of code mean in Laravel?

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Take a look at this line of Laravel code on the internet, however I don't know how it is interpreted. The line is the following:

$oldCart = Session::has('cart') ? Session::get('cart') : null;

I would appreciate your explanation.

php

2 Answers

  1. Best Answer

    First question : what does this code do?

    $oldCart = Session::has('cart') ? Session::get('cart') : null;

    the Session::has('cart')Determine if an element exists in the session in this casecart

    Session::get('cart')get the value of the session

    Second Question : what does it mean ?and :it is nothing more than a short if to assign it is usually done in this way:

    if (Session::has('cart')){
   $oldCart =  Session::get('cart') 
}else{
   $oldCart =  null;
}

    reads like this: ?then and :otherwise

    It is obligatory to maintain this order, that is, the first goes ?and then the :

    It is very common to see them in other programming languages

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  2. Use the inline if or ternary operator to assign the value of the variable oldCart . If the expression (condition) before the "?" returns the value between "?" and ":" otherwise return the value after the ":".

    • If the session has cart defined , that value is assigned to oldCart .
    • If the session does NOT have cart defined , the value of oldCart will be null.
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