What does php double vertical bar mean?

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The php double vertical bar indicates that the expression of the "or", "or" operator in the PHP logical operator is "x | | y", which means that if at least one of the two variable values x and y is true, true is returned.

The operating environment of this paper: Windows7 system, PHP7.1, Dell G3.

What does php double vertical bar mean?

The php double vertical bar represents the OR in the PHP logical operator.

X | | y

Or

Returns true if at least one of x and y is true

X=6y=3 (xylene 5 | | yearly room5) returns false

More logical operators are as follows:

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