Constructs a ReflectionFunction object

# 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

- ReflectionMethod::__construct() - Constructs a ReflectionMethod
- Constructors

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