Class PHPStan\Type\CallableType

Returns all class names referenced anywhere in this type, recursively (including generic arguments, callable signatures, etc.).

Returns class names of the object types this type directly represents. Unlike getReferencedClasses(), excludes classes in generic arguments, etc.

Unlike isSuperTypeOf(), accepts() takes into account PHP's implicit type coercion. With $strictTypes = false, int is accepted by float, and Stringable objects are accepted by string.

"Does every value of $type belong to $this type?" Preferable to instanceof checks because it correctly handles union types, intersection types, and all other composite types.

Answers "is this compound type a subtype of $otherType?" from the compound type's perspective. Called by simple types when they encounter a CompoundType argument in their isSuperTypeOf() method. The compound type decomposes itself and calls $otherType->isSuperTypeOf() for each component. For example, UnionType(string|int)::isSubTypeOf(MixedType) asks MixedType whether it is a supertype of string and int separately, then combines with extremeIdentity (all must pass).

Answers "is this compound type accepted by $acceptingType?" from the compound type's perspective. Called by simple types when they encounter a CompoundType argument in their accepts() method. The compound type decomposes itself and calls $acceptingType->accepts() for each component. For example, UnionType(string|int)::isAcceptedBy(StringType) asks StringType to accept string and int separately, then combines results with extremeIdentity (all must pass).

Tracks when calling a closure invalidates cached type information for variables it captures by reference.

Whether the callable is marked with the #[\NoDiscard] attribute. On PHP 8.5+ if the return value is unused at runtime, a warning is emitted. PHPStan reports this during analysis regardless of PHP version.

Models numeric coercion for arithmetic operators.

Models the bitwise-not (~$x) operator. Returns ErrorType for types where ~ is undefined.

Models abs().

Models the (string) cast.

Models the (int) cast.

Models the (float) cast.

Models the (array) cast.

Models PHP's implicit array key coercion: floats truncated to int, booleans become 0/1, null becomes '', numeric strings become int.

Returns how this type might change when passed to a typed parameter or assigned to a typed property. With $strictTypes = true: int widens to int|float (since int is accepted by float parameters in strict mode). With $strictTypes = false: additional coercions apply, e.g. Stringable objects are accepted by string parameters. Used internally to determine what types a value might be coerced to when checking parameter acceptance.

After template type inference at a call site, this map contains the concrete types inferred for each template parameter.

Infers the real types of TemplateTypes found in $this, based on the received Type. E.g. if $this is array<T> and $receivedType is array, infers T = int.

Returns the template types referenced by this Type, recursively. The return value is a list of TemplateTypeReferences, who contain the referenced template type as well as the variance position in which it was found. For example, calling this on array<Foo<T>,Bar> (with T a template type) will return one TemplateTypeReference for the type T.

Returns a new instance with all inner types mapped through $cb. Returns the same instance if inner types did not change. Not used directly — use TypeTraverser::map() instead.

Like traverse(), but walks two types simultaneously. Not used directly — use SimultaneousTypeTraverser::map() instead.

An oversized array is a constant array shape that grew too large to track precisely and was degraded to a generic array type.

Is Type of a known constant value? Includes literal strings, integers, floats, true, false, null, and array shapes. Unlike isConstantScalarValue(), this also returns yes for constant array types (array shapes with known keys and values). Use this when you need to detect any constant value including arrays.

Is Type of a known constant scalar value? Includes literal strings, integers, floats, true, false, and null. Unlike isConstantValue(), this does NOT return yes for array shapes. Use this when you specifically need scalar constants only.

When isDecimalIntegerString() returns yes(), the type is guaranteed to be cast to an integer in an array key. Examples of constant values covered by this type: "0", "1", "1234", "-1" When isDecimalIntegerString() returns no(), the type represents strings containing non-decimal integers and other text. These are guaranteed to stay as string in an array key. Examples of constant values covered by this type: "+1", "00", "18E+3", "1.2", "1,3", "foo"

Non-falsy string is a non-empty string that is also not '0'. Stricter subset of non-empty-string.

A literal-string is a string composed entirely from string literals in the source code (not from user input). Used for SQL injection prevention.

Returns the object type for a class-string or literal class name string. For non-class-string types, returns ErrorType.

Like getClassStringObjectType(), but also returns object types as-is. Used for $classOrObject::method() where the left side can be either.

Returns the single enum case this type represents, or null if not exactly one case.

Models the ** operator.

Returns a list of finite values this type can take. Examples: - for bool: [true, false]

• for int<0, 3>: [0, 1, 2, 3]
• for enums: list of enum cases
• for scalars: the scalar itself For infinite types it returns an empty array.

Performance optimization to skip template resolution when no templates are present.