The efficiency problem of ternary operator-condition (ternary) operator

Conditional (ternary) operator (?:)

The conditional operator?: accepts three operands, which is the only ternary operator in C #.

Return one of the following two expressions, as appropriate.

Test? Expression1:expression2

The expression expression1 returned when test is true. may be a comma expression.

The expression expression2 returned when test is false. may be a comma expression.

?: operator can be used as a shortcut to a if...else statement.

Conditional operator (ternary operator) efficiency problem

Let's take a look at this piece of code:

$name = GET('name') != null ? GET('name') : '';

function GET($key)
{
if (isset($_GET[$key]))
{
　　 $fp = fopen('c.txt','a');
　　 fwrite($fp, '1-');
　　 fclose($fp);
　　 return $_GET[$key];
}

return null;
}

After running, found that the contents of the C.txt file is 1-1-

Obviously, the GET function was executed two times.

Later still in this form:

$name = GET('name');
$name = $name != null ? $name : '';

Although the code is a bit long, the efficiency is relatively small (if the call is a memory-intensive function, the problem is obvious)

Operator Precedence