The ? Operator PHP

PHP offers an abbreviated version of the if statement which borrows syntax from C. It uses the question mark as a tertiary operator. outlines the format.

The ? Operator

Operator

Covering All Cases withif-elseif-else

Covering All Cases withif-elseif-else

Covering All Cases withif-elseif-else

The conditional expression is evaluated to be either true or false. If true, the expression between the question mark and the colon is executed. Otherwise, the expression after the colon is executed. The following code fragment

($clientQueue > 0) ? serveClients() : cleanUp();
does the same thing as
if($clientQueue > 0)
serveClients();
else
cleanUp();

The similarity is deceiving. Although the abbreviated form seems to be equivalent to using if-else, at a deeper level it is not. As I said, ? is an operator, not a statement. This means that the expression as a whole will be evaluated. The value of the matched expression takes the place of the ? expression. In other words, something like

print(true ? "it's true" : "it's false");

is a valid statement. Since the conditional expression is true, the line will be transformedinto

print("it's true");

which is something you can't do with an if statement. The ? operator can be confusing to read and is never necessary. It wouldn't be bad if you never used it. On the other hand it allows you to write very compact code.



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