PHP ReflectionProperty::getHook() Method: Usage and Examples

When building tools that inspect PHP code, ReflectionProperty::getHook() helps answer a focused question: returns the reflected get or set property hook, if present.

Reflection is useful in framework tooling, dependency injection, testing, code inspection and debugging.

What Is ReflectionProperty::getHook()?

Returns the reflected get or set property hook, if present.

Its method signature is:

public function getHook(PropertyHookType $type): ?ReflectionMethod

Parameters:

• $type — Requested type or property-hook type to inspect Required.

Return value: ?ReflectionMethod

Example 1: Inspect a property declaration

Start with a self-contained PHP declaration and inspect the method result.

<?php

declare(strict_types=1);

#[Attribute(Attribute::TARGET_PROPERTY)]
class FieldLabel { public function __construct(public string $label) {} }
class BaseData { protected string $source = 'local'; }
class CustomerData extends BaseData {
    #[FieldLabel('identity')]
    public string $name = 'Morgan';
    public private(set) string $token = 'abc';
    public protected(set) int $level = 1;
    public readonly int $identifier;
    public static int $counter = 3;
    public string $label { get => strtoupper($this->name); }
    public string $initials { get => substr($this->name, 0, 1); }
    final public string $finalLabel { get => $this->name; }
    public int $delayed;
    public function __construct(public string $city = 'Rome') { $this->identifier = 10; }
}
$propertyReflection = new ReflectionProperty(CustomerData::class, "label");

$result = $propertyReflection->getHook(PropertyHookType::Get);
echo $result?->getName() ?? "no hook";

Output:

$label::get

Explanation: Returns the reflected get or set property hook, if present.

Example 2: Explore another property context

Next, change the reflected declaration or parameter to observe a related situation.

<?php

declare(strict_types=1);

#[Attribute(Attribute::TARGET_PROPERTY)]
class FieldLabel { public function __construct(public string $label) {} }
class BaseData { protected string $source = 'local'; }
class CustomerData extends BaseData {
    #[FieldLabel('identity')]
    public string $name = 'Morgan';
    public private(set) string $token = 'abc';
    public protected(set) int $level = 1;
    public readonly int $identifier;
    public static int $counter = 3;
    public string $label { get => strtoupper($this->name); }
    public string $initials { get => substr($this->name, 0, 1); }
    final public string $finalLabel { get => $this->name; }
    public int $delayed;
    public function __construct(public string $city = 'Rome') { $this->identifier = 10; }
}
$propertyReflection = new ReflectionProperty(CustomerData::class, "name");

$result = $propertyReflection->getHook(PropertyHookType::Get);
echo $result?->getName() ?? "no hook";

// Check the returned value type before using the result.
echo "\nResult type: " . get_debug_type($result);

Output:

no hook
Result type: null

Explanation: Requires a PropertyHookType case; a plain property has no hook.

Practical Example: Apply reflection to a data model

This final case shows how the same API can be used when inspecting application definitions.

<?php

declare(strict_types=1);

#[Attribute(Attribute::TARGET_PROPERTY)]
class FieldLabel { public function __construct(public string $label) {} }
class BaseData { protected string $source = 'local'; }
class CustomerData extends BaseData {
    #[FieldLabel('identity')]
    public string $name = 'Morgan';
    public private(set) string $token = 'abc';
    public protected(set) int $level = 1;
    public readonly int $identifier;
    public static int $counter = 3;
    public string $label { get => strtoupper($this->name); }
    public string $initials { get => substr($this->name, 0, 1); }
    final public string $finalLabel { get => $this->name; }
    public int $delayed;
    public function __construct(public string $city = 'Rome') { $this->identifier = 10; }
}
$propertyReflection = new ReflectionProperty(CustomerData::class, "initials");

$result = $propertyReflection->getHook(PropertyHookType::Set);
echo $result?->getName() ?? "no hook";

// Use the reflection result in a simple decision.
if (is_bool($result)) {
    echo "\nStatus: " . ($result ? "yes" : "no");
} elseif (is_array($result)) {
    echo "\nEntries: " . count($result);
} elseif ($result === null) {
    echo "\nNo value returned";
} else {
    echo "\nReflection result available";
}

Output:

no hook
No value returned

Explanation: getHooks returns all available hooks as a keyed array.

Important Behavior and Edge Cases

• Requires a PropertyHookType case; a plain property has no hook.
• getHooks returns all available hooks as a keyed array.
• Reflection describes declarations and runtime state; requesting metadata does not automatically validate or sanitize application input.

Comparison With Related Approaches

Common Beginner Mistakes

Key Takeaways

• Returns the reflected get or set property hook, if present.
• Requires a PropertyHookType case; a plain property has no hook.
• getHooks returns all available hooks as a keyed array.

Use ReflectionProperty::getHook() when you need the precise metadata or behavior demonstrated above. Keep the target declaration and relevant PHP version in mind when adapting the examples.