PHP ===和？ 和：符号含义[重复]

Question

This question already has an answer here:

• Reference — What does this symbol mean in PHP? 18 answers
• How do I use the ternary operator ( ? : ) in PHP as a shorthand for “if / else”? 11 answers

This is an extract from a WebSocket client, what does the following code line mean/do ?

$frameHead[1] = ($masked === true) ? $payloadLength + 128 : $payloadLength;

I read it this way (check below)

If Masked == True Then $frameHeadHead[1] = $payloadLength + 128 / $payloadLength

I don't understand the ($masked === true) as well as I dont understand the : $payLoadLength; (what is the : symbol for ?)

And what if Masked == False ? There is no result ?

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Answer 1

That(?:) is called the ternary operator.

(condition) ? /* if condition is true then return this value */ 
            : /* if condition is false then return this value */ ;

Also === compares the internal object id of the objects. It is used for strict comparison. "===" means that they are identical.

On a side note:

Note: Please note that the ternary operator is an expression, and that it doesn't evaluate to a variable, but to the result of an expression. This is important to know if you want to return a variable by reference. The statement return $var == 42 ? $a : $b; in a return-by-reference function will therefore not work and a warning is issued in later PHP versions.