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ReflectionFunction::__construct

(PHP 5, PHP 7, PHP 8)

ReflectionFunction::__construct — Constructs a ReflectionFunction object

Description

public ReflectionFunction::__construct(Closure|string $function)

Constructs a ReflectionFunction object.

Parameters

function

The name of the function to reflect or a closure.

Errors/Exceptions

A ReflectionException if the function parameter does not contain a valid function.

Examples

Example #1 ReflectionFunction::__construct() example

<?php
/**
* A simple counter
*
* @return int
*/
function counter1()
{
static $c = 0;
return ++$c;
}

/**
* Another simple counter
*
* @return int
*/
$counter2 = function()
{
static $d = 0;
return ++$d;

};

function dumpReflectionFunction($func)
{
// Print out basic information
printf(
"\n\n===> The %s function '%s'\n".
" declared in %s\n".
" lines %d to %d\n",
$func->isInternal() ? 'internal' : 'user-defined',
$func->getName(),
$func->getFileName(),
$func->getStartLine(),
$func->getEndline()
);

// Print documentation comment
printf("---> Documentation:\n %s\n", var_export($func->getDocComment(), 1));

// Print static variables if existant
if ($statics = $func->getStaticVariables())
{
printf("---> Static variables: %s\n", var_export($statics, 1));
}
}

// Create an instance of the ReflectionFunction class
dumpReflectionFunction(new ReflectionFunction('counter1'));
dumpReflectionFunction(new ReflectionFunction($counter2));
?>

The above example will output something similar to:

===> The user-defined function 'counter1'
     declared in Z:\reflectcounter.php
     lines 7 to 11
---> Documentation:
 '/**
 * A simple counter
 *
 * @return    int
 */'
---> Static variables: array (
  'c' => 0,
)


===> The user-defined function '{closure}'
     declared in Z:\reflectcounter.php
     lines 18 to 23
---> Documentation:
 '/**
 * Another simple counter
 *
 * @return    int
 */'
---> Static variables: array (
  'd' => 0,
)

See Also