Php: what is the difference between | And || operator

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Reference - What does this symbol mean in PHP?
What is the difference between the | and || operators?

Just bumped into this line of code, and I was wondering what is the difference between these two case:

The person who did this do not remember what was the meaning, but it was important.

...
if ($condition1 | $condition2) {
...
...
if ($condition1 || $condition2) {
...

| is a bitwise or, || is a logical or. | operates on binary values whereas || operates on boolean ones.

E.g. 5 | 3 is 0101 OR 0011 which is 0111 which is 7, whereas True || False is True and False || False is False.