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Arithmetic operation with unsupported operands

Reports arithmetic and bitwise expressions with unsupported operands.

Starting with PHP 8.0, using the arithmetic and bitwise operators +, -, *, /, **, %, <<, >>, &, |, ^, ~, ++, -- when one of the operands is an array, resource, or non-overloaded object will result in a TypeError. The only exception is the array + array merge operation, which remains supported.

See PHP's internal test source for the complete list of operations.

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

PhpArithmeticTypeCheckInspection
Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | PHP | Type compatibility

Inspection Details

By default bundled with:

PhpStorm 2024.2, Qodana for PHP 2024.2,

Can be installed with plugin:

PHP, 242.22893

Last modified: 11 September 2024