1.2.230. Constant Scalar Expressions

Define constant with the result of static expressions. This means that constants may be defined with the const keyword, with the help of various operators but without any functioncalls.

This feature was introduced in PHP 5.6. It also supports array(), and expressions in arrays.

Those expressions (using simple operators) may only manipulate other constants, and all values must be known at compile time.

<?php

// simple definition
const A = 1;

// constant scalar expression
const B = A * 3;

// constant scalar expression
const C = [A ** 3, '3' => B];

?>

See also Constant Scalar Expressions.

1.2.230.1. Specs

Short name	Structures/ConstantScalarExpression
Rulesets	All, Appinfo, CE, Changed Behavior, CompatibilityPHP53, CompatibilityPHP54, CompatibilityPHP55
Exakat since	0.8.4
PHP Version	With PHP 5.6 and more recent
Severity	Major
Time To Fix	Quick (30 mins)
Changed Behavior	PHP 5.6 - More
Precision	Very high
Features	constant-scalar-expression
Available in	Entreprise Edition, Community Edition, Exakat Cloud