Description:
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From manual page: https://php.net/function.is-numeric
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I found out to my surprise that is_numeric(" 3") returns true, but is_numeric("3 ") returns false. Spaces at the beginning of a string have no effect; spaces at the end do, making the string not numeric.

Assuming that's the expected behavior, that's far from obvious and should be documented.

The docs say:
"Numeric strings consist of optional sign, any number of digits, optional decimal part and optional exponential part."

There's no mention whatsoever of spaces. From that description, taken literally, I'd expect a space at the beginning to ALSO be considered non-numeric. Short of that, I'd expect spaces to be either ignored both at the beginning and end or neither.

Test script:
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echo is_numeric("3")?"Yes\n":"no\n";
echo is_numeric("   3")?"Yes\n":"no\n";
echo is_numeric("3 ")?"Yes\n":"no\n";

Expected result:
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documentation should be exhaustive

Actual result:
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documentation doesn't document the behavior properly.