ReflectionParameter::getDefaultValueConstantName
(PHP 5 >= 5.4.6, PHP 7, PHP 8)
ReflectionParameter::getDefaultValueConstantName — Returns the default value's constant name if default value is constant or null
说明
public ReflectionParameter::getDefaultValueConstantName(): ?string
Returns the default value's constant name of the parameter of any user-defined or internal function or method, if default value is constant or null. If the parameter is not optional a ReflectionException will be thrown.
参数
此函数没有参数。
返回值
Returns string on success or null on failure.
更新日志
| 版本 | 说明 |
|---|---|
| 8.0.0 | This method now allows getting the default values' constant names of built-in functions and built-in class methods. Previously, a ReflectionException was thrown. |
范例
示例 #1 Getting default values' constant names of function parameters
<?php
function foo($test, $bar = PHP_INT_MIN)
{
echo $test . $bar;
}
$function = new ReflectionFunction('foo');
foreach ($function->getParameters() as $param) {
echo 'Name: ' . $param->getName() . PHP_EOL;
if ($param->isOptional()) {
echo 'Default value: ' . $param->getDefaultValueConstantName() . PHP_EOL;
}
echo PHP_EOL;
}
?>
以上例程会输出：
Name: test Name: bar Default value: PHP_INT_MIN
参见
- ReflectionParameter::isOptional() - Checks if optional
- ReflectionParameter::isDefaultValueConstant() - Returns whether the default value of this parameter is a constant
- ReflectionParameter::getDefaultValue() - Gets default parameter value
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