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.
Suppressing Inspection
You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:
More detailed instructions as well as other ways and options that you have can be found in the product documentation:
Inspection Details | |
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By default bundled with: | IntelliJ IDEA 2025.2, PhpStorm 2025.2, Qodana for JVM 2025.2, Qodana for PHP 2025.2, |