call a static method within originating class

Question

I'm looking for a way to replace __NAMESPACE__ in the following code:

namespace classes\utility;
class Cleanse
{
    public static function escape($values)
    {
        return is_array($values) ?
                    array_map(__NAMESPACE__.'\Cleanse::escape', $values) :
                    htmlentities($values, ENT_QUOTES, 'UTF-8');
    }
}

From doing some reading, I tried this:

public static function escape($values)
{
    return is_array($values) ?
                array_map([static::class, 'escape'], $values) :
                htmlentities($values, ENT_QUOTES, 'UTF-8');
}

but got this error:

Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$'
and it referred to the array_map line of code.

I'm looking for a solution that's compatible with PHP version 5.4.4 and above, and something that is not going to be deprecated any time soon.

EDIT: I was unable to find the answer in the proposed duplicate post because it is so long. Therefore, I do not agree that this is a duplicate posting.

Change was 5.5? "Class name resolution via ::class" fwiw... https://stackoverflow.com/questions/18050071/php-parse-syntax-errors-and-how-to-solve-them — ficuscr, Feb 04 '19 at 22:57
You might have to use [get_called_class()](http://php.net/manual/en/function.get-called-class.php) instead of `static::class` — Scuzzy, Feb 04 '19 at 22:59

score 3 · Accepted Answer · answered Feb 04 '19 at 23:01

Because you've said you're using PHP 5.4, you will need to use http://php.net/manual/en/function.get-called-class.php

Replace

static::class

With

get_called_class()

Because the static::class syntax was added in version 5.5.0

http://php.net/manual/en/language.oop5.changelog.php

5.5.0 Added: The ::class magic constant.

ArtisticPhoenix · Answer 2 · 2019-02-05T02:34:44.287

Simply use the __METHOD__ magic constant as this is a recurisve call.

namespace classes\utility;

class Cleanse
{
    public static function escape($values)
    {

        //array_map(__CLASS__.'::escape', $values) :
        //array_map(__CLASS__.'::'.__FUNCTION__, $values) :
        //etc... all work
        return is_array($values) ?
                    array_map(__METHOD__, $values) :
                    htmlentities($values, ENT_QUOTES, 'UTF-8');
    }
}

$C = new Cleanse();
print_r( $C->escape(["foo"]) );

Output

['foo']

Sandbox -note- you can change PHP versions in the sandbox, for example changing it to 5.4

If you are worried about overwriting and late static binding then you have to use get_called_class no matter what. But that shouldn't be an issue with a recursive call one would think, as if you overwrite it, then it is still the method and it doesn't access any internal data to the class.

score 0 · Answer 3 · answered Feb 04 '19 at 22:55

0

<?php
class MyClass {
    const CONST_VALUE = 'A constant value';
}

$classname = 'MyClass';
echo $classname::CONST_VALUE; // As of PHP 5.3.0

echo MyClass::CONST_VALUE;
?>

Three special keywords self, parent and static are used to access properties or methods from inside the class definition.

Example #2 :: from inside the class definition

<?php
class OtherClass extends MyClass
{
    public static $my_static = 'static var';

    public static function doubleColon() {
        echo parent::CONST_VALUE . "\n";
        echo self::$my_static . "\n";
    }
}

$classname = 'OtherClass';
$classname::doubleColon(); // As of PHP 5.3.0

OtherClass::doubleColon();
?>

http://php.net/manual/en/language.oop5.paamayim-nekudotayim.php

answered Feb 04 '19 at 22:55

zod

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Can you give an example of accessing a static method from within the class where it's defined? That is what I'm having trouble with. – knot22 Feb 04 '19 at 22:59
what happen when yout try like this self::callyourMethod(); – zod Feb 04 '19 at 23:03
When I tried `self::escape()` it gave 3 warnings and 2 notices. – knot22 Feb 04 '19 at 23:06

call a static method within originating class

3 Answers3