Constructs a ReflectionFunction object

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- 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 classdumpReflectionFunction(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