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This document uses PHP Chinese website manual Release
(PHP 5 >= 5.0.3)
ReflectionParameter::getDefaultValue — Gets default parameter value
Gets the default value of the parameter for a user-defined function or method. If the parameter is not optional a ReflectionException will be thrown.
此函数没有参数。
The parameters default value.
Example #1 Getting
<?php
function foo ( $test , $bar = 'baz' )
{
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 -> getDefaultValue () . PHP_EOL ;
}
echo PHP_EOL ;
}
?>
以上例程会输出:
Name: testName: bar Default value: baz
Note:
Due to implementation details, it is not possible to get the default value of built-in functions or methods of built-in classes. Trying to do this will result a ReflectionException being thrown.