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Error Identifier: property.dynamicName

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

class User
{
	public string $name = '';
	public string $email = '';
}

function getValue(User $user, string $field): mixed
{
	return $user->$field;
}

Why is it reported? #

The code accesses an object property using a variable name ($object->$variable) instead of a static identifier ($object->name). Variable property access makes the code harder to analyse statically because PHPStan cannot determine which property is being accessed. It also makes the code harder to refactor and more error-prone, since there is no compile-time check that the property exists.

This rule is provided by the phpstan-strict-rules package.

How to fix it #

Replace the variable property access with explicit property access:

 <?php declare(strict_types = 1);
 
-function getValue(User $user, string $field): mixed
+function getValue(User $user, string $field): string
 {
-	return $user->$field;
+	return match ($field) {
+		'name' => $user->name,
+		'email' => $user->email,
+		default => throw new \InvalidArgumentException("Unknown field: $field"),
+	};
 }

Alternatively, use a getter method or implement a controlled access pattern that does not rely on dynamic property names.

How to ignore this error #

You can use the identifier property.dynamicName to ignore this error using a comment:

// @phpstan-ignore property.dynamicName
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: property.dynamicName

Rules that report this error #

• PHPStan\Rules\VariableVariables\VariablePropertyFetchRule [1] phpstan/phpstan-strict-rules

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