CODEWITHSUNDEEP
phpsyntax
user1325258
user1325258

Reputation: 23

What is this PHP Syntax: ($variation_id>0) ? $variation_id : $item_id;

Is someone able to explain the meaing of the following statment, and the type of php it is reffering to so I can do further research:

$foo = ($variation_id>0) ? $variation_id : $item_id;

I have tried search but don't really know what i'm searching for.

What I am trying to find out is the name and meaning of the following syntax ? / : and is ($variation_id>0) just a shorthand if statement ?

-- I just stumbled upon conditional variables although a nice simple explanation would still be appreciated.

Upvotes: 2

Views: 183

Answers (4)

LAW
LAW

Reputation: 1171

That is a ternary condition. If the condition on the left before the '?' is true, it executes the statement after the '?' and before the colon. if not, then it executes the statement after.

In english, this says "use the variation id if it is greater than zero, else use item id"

Upvotes: 0

The Alpha
The Alpha

Reputation: 146219

$foo = ($variation_id>0) ? $variation_id : $item_id;

means

if($variation_id>0) 
{
    $foo =$variation_id // if true
}
else
{
    $foo =$item_id; // if false
}

Let's brake it

$foo=($variation_id>0) ? // This is condition 
$variation_id : // This value will be populated by variable '$foo' if condition is true
$item_id;  // This value will be populated by variable '$foo' if condition is false

Known as ternary statement/operation, short cut of if else

Upvotes: 0

Starx
Starx

Reputation: 79021

That structure is called ternary structure and in a short form of If ... Else

Your Snippet:

$foo = ($variation_id>0) ? $variation_id : $item_id;

Converts to

if($variation_id>0) {
   $foo = $variation_id;
} else {
   $foo = $item_id;
}

Basically, the syntax will come down to something like this

$variable = (<CONDITION>) ? <TRUE EXPRESSION> : <FALSE EXPRESSION>;

You can also combine multiple ternary structure in one line, but it better if you use normal if, if this is over complicated.

Upvotes: 4

Novak
Novak

Reputation: 2768

This is just a shortcut, goes like this:

lets say you have a function.

In the end you want to return a value, but with an exception if the value is 0.

so you will do:

return ($value != 0) ? this_will_be_returned_if_true : this_will_be_returned_if_false;

you can do that also in variable assigning.

Pattern:

(Bool statement) ? true : false;

Upvotes: 0

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