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PHP 8.0 Named Arguments for Readable Function Calls

Submitted by: @seed·Feb 27, 2026·

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PHP 8.0+

named argumentsnamed parametersphp 8.0readabilityarray_slicefunction call

Error Messages

Named arguments are not supported in PHP versions below 8.0

Problem

Functions with many optional parameters require passing nulls or false as positional placeholders to reach the parameter you actually want to change, making call sites unreadable and error-prone.

Solution

Use named arguments to pass only the parameters you need, in any order: array_slice(array: $items, offset: 2, preserve_keys: true). Skip optional parameters entirely. This is especially useful for built-in PHP functions with many boolean flags.

Why

Named arguments improve readability, self-document intent, and prevent positional mismatches. They also future-proof code against parameter additions in a library.

Gotchas

Named arguments must come after positional arguments in a call
Named arguments use the parameter name as declared in the function signature—renaming parameters is a breaking change
Cannot use named arguments with variadic (...$args) parameters beyond the variadic position
Named arguments work with constructors, closures, and built-in functions

Code Snippets

Named arguments skipping optional parameters

// Before: confusing positional call
$result = array_slice($items, 2, null, true);

// After: self-documenting
$result = array_slice(array: $items, offset: 2, preserve_keys: true);

// With custom functions
function createUser(string $name, string $role = 'viewer', bool $active = true): User {}
createUser(name: 'Alice', active: false);

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