PHP: Getting value of constant of class from string

Question

The example is following：

<?php

class test{
    const A = "1";
    const B = "2";

    public function getStr($a){
        echo self::$a;
    }

}

$c = new test();
$c->getStr("A");


 ?>

How can I echo variable "A" in the window, when I use getStr("A")

You could make a construct() function for that

Herry Potei
– Herry Potei

2017-09-29 03:52:35 +00:00
Commented Sep 29, 2017 at 3:52 — Herry Potei
– Herry Potei, Commented Sep 29, 2017 at 3:52

Sahil Gulati · Accepted Answer · 2017-09-29 03:53:47Z

1

It can be done with ReflectionClass::getConstants.

Try this code snippet here

<?php

ini_set('display_errors', 1);

class test{
    const A = "1";
    const B = "2";

    public function getStr($a){

        $class= new ReflectionClass(self::class);//passing class name to ReflectionClass
        echo $class->getConstant($a);//getting required constant.
    }

}

$c = new test();
$c->getStr("A");

answered Sep 29, 2017 at 3:53

Sahil Gulati

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2 Comments

Ankur Garg Over a year ago

Will it support in PHP version 5.4

Sahil Gulati Over a year ago

@AnkurGarg Yes it do support. You can check the documentation here php.net/manual/en/reflectionclass.getconstants.php

Jack jdeoel · Accepted Answer · 2017-09-29 04:24:50Z

0

constant() is useful if you need to retrieve the value of a constant, but do not know its name. I.e. it is stored in a variable or returned by a function.

Constant Doc

echo constant("self::".$a);

answered Sep 29, 2017 at 4:24

Jack jdeoel

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