What is |= 1

[Glowball]

I saw someone use |= in their code but I can't find any reference to it in the manual. If I run this code it returns 1:

$myVar |= 1;
echo $myVar;

What does it mean? Thanks!

 

[sleipnir214]

It's "bitwise or equals", and is equivalent to:

$myVar = $myVar | 1;

It basically toggles on the least significant bit of the original value.

Nearly every PHP operator can be used in a single operation with "=".


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[Glowball]

Thanks, I figured it was a bitwise thing but I couldn't find a reference!

 

[sleipnir214]

There really isn't one. The only mention of the so-called "combined operators", liek +=, -=, etc is

In addition to the basic assignment operator, there are "combined operators" for all of the binary arithmetic and string operators that allow you to use a value in an expression and then set its value to the result of that expression.

which appears here


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