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PHP Constants and define()

PHP constants are named values declared by const or define(). Constants should represent stable configuration and must not be confused with secrets loaded at.

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PHP Default Function Arguments

Default function arguments apply when the caller omits an argument, not whenever a null value is supplied. Avoid mutable shared default objects; use explicit nullable defaults when null is.

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PHP For Loops

A for loop provides initialization, condition and update expressions for repeated work. Avoid off-by-one errors and evaluating expensive conditions.

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PHP Foreach Loops

foreach iterates arrays and Traversable objects by value or reference. Unset reference variables after a foreach-by-reference to avoid accidental later.

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PHP Heredoc and Nowdoc Syntax

Heredoc supports multiline strings with interpolation, while nowdoc treats content literally. Closing markers must follow PHP syntax rules; never assume interpolated data is safe.

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PHP If, Elseif, and Else

if, elseif and else select different code branches based on boolean conditions. Prefer strict comparisons and avoid a long deeply nested chain of.

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PHP Intersection and DNF Types

Intersection types require a value to satisfy every listed interface, and DNF types allow unions of intersections. Parenthesize intersections inside unions; DNF types were introduced in PHP.

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