Why do so many examples in php reverse the sequence of arguments to comparison operators, e.g. 0 ===-CodePudding

In so many php examples I see e.g. if (0 === $i) { } instead of if ($i === 0) { }

I wonder where this comes from? All classical literature on algorithms and programming has it the way you would read it, with the variable first and the value second. So I wonder whether there is any computational benefit to it, and where this idea came from in the first place.

CodePudding user response：

This is called Yoda style and is popular among some PHP environments, like WordPress for example. It's considered a bad practice by many, including me.

The reason to use it is to avoid the single equal sign mistake:

if ($a = 5) {/* always true*/}

// vs.

if (5 = $a) {/* syntax error */}

CodePudding user response：

it's called the yoda condition, in case you accidently typed single = instead of 2 or 3 (example: 0 = $i) it will generate an error instead of variable assignement ($i = 0) which will make you lose some time debugging to find the problem