PHP coding standards (27)_PHP tutorial

9.3.4 Expression before operator "?"

If an expression containing a binary operator appears before the "?" of the ternary operator "? :", then a pair of parentheses should be added to the expression. For example:
(x >= 0) ? x : -x;

9.3.5 Special Notes

Use XXX in comments to identify something that is not implemented (bogus) but works (works). Use FIXME to identify certain fake and erroneous content.

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