Laravel - using array_walk_recursive() in a Laravel Class

Question

I'm bringing a standard php class into Laravel.

The problem I'm having is calling the printable function using array_walk_recursive().

This the snippet of code from my class:

public static function print_r($response)
{
    // Format response (for testing)

    if (is_object($response)) $response = (array)$response;
    if (!is_array($response) && $response) $response = json_decode($response, true);
    if (is_array($response))
    {
        array_walk_recursive($response, "printable");
        echo "<pre>" . print_r($response, true) . "</pre>";
    }
}

private static function printable(&$v, $k)
{
    // Format response (for testing)

    if (!is_array($v))
    {
        if (is_bool($v))
        {
            if ($v) $v = "true"; else $v = "false";
        }
        else if (is_null($v))
        {
            $v = "null";
        }
        else
        {
            $v = trim(str_replace("<", "&lt;", str_replace(">", "&gt;", $v)));
        }
    }
}

The error:

"array_walk_recursive() expects parameter 2 to be a valid callback, function 'printable' not found or invalid function name"

So it seems like it's just not finding the printable function. What do I need to do differently?

Does this answer your question? How to use class methods as callbacks — mickmackusa
– mickmackusa ♦, Commented Mar 7, 2024 at 3:33

Alexey Mezenin · Accepted Answer · 2016-12-22 16:15:51Z

2

You need to specify the object. In this case it will be self:

array_walk_recursive($response, 'self::printable');

edited Dec 22, 2016 at 16:15

answered Dec 22, 2016 at 15:06

Alexey Mezenin

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3 Comments

Matt Over a year ago

I'm afraid that gives the error "Undefined variable: this"

Alexey Mezenin Over a year ago

Oh yeah, you're using static methods. Please try updated code.

Neo Over a year ago

Thank you, It works for me.

private function addSpan(&$value, $key)     {         $value = "<span>{$value}</span>";     }  array_walk($replace, 'self::addSpan');

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