phanalist

E0049: Invalid Builtin Argument

E0049 reports builtin calls whose literal arguments are invalid and would make PHP throw a ValueError at runtime.

What it checks

• str_repeat() with a negative repeat count
• array_fill() with a negative count
• range() with a zero step
• str_split() and mb_str_split() with a non-positive chunk length
• explode() with an empty delimiter
• array_chunk() with a non-positive chunk size
• array_combine() with literal arrays of different lengths
• random_int(), mt_rand(), and rand() with a minimum greater than the maximum

The rule only reports values it can prove from literals, including unary minus, parenthesized literals, and literal array lengths. Non-literal arguments are ignored so the rule does not duplicate runtime type analysis.

Model limits

• Only direct calls to the named builtins are checked.
• Named arguments are matched by their source order, not by parameter name.
• Array lengths are known only for literal arrays without missing or variadic elements.
• Integer values that do not fit in i64 are ignored.
• The rule does not evaluate constants, class constants, or expressions.

Configuration

E0049 has no configuration options and is enabled by default.

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