The Conditional Operators of PHP: "?" and ":**"
In PHP, the "?" and ":" operators, collectively known as the conditional operator, allow you to evaluate a condition and conditionally assign a value to a variable.
Syntax:
$x ? $y : $z
Meaning:
This expression evaluates to $y if $x is true; otherwise, it evaluates to $z.
Example:
($request_type == 'SSL') ? HTTPS_SERVER : HTTP_SERVER
This expression returns the value of HTTPS_SERVER if $request_type is equal to 'SSL', otherwise it returns the value of HTTP_SERVER.
Short Form:
For convenience, PHP provides a short form of the conditional operator:
$x ?: $z
This expression is equivalent to:
$x ? $x : $z
It evaluates to $x if $x is true, otherwise it evaluates to $z.
Note:
It's important to note that the conditional operator is not specifically called "the ternary operator." While it is a ternary operator due to its three operands, many languages have multiple ternary operators.
The above is the detailed content of How Does PHP's Conditional Operator (?:) Work?. For more information, please follow other related articles on the PHP Chinese website!
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