PHP function to validate array elements for n level

Question

I have tried out with the google and tried myself to get done for the below functionality. I need a function that will validate each array element whether it is scalar or not. So i wrote a simple function that will iterate each element of the array and checks for scalar or not.

But the real requirement, the array could be a multi dimentional array. So i have modified the array and called the function recursively as below, But it will not go-through all elements in the array.

function validate_scalar($params)
{
    foreach ($params as $key => $arg)
    {
        if (is_array($arg))
        {
            validate_scalar($arg);
        }
        else
        {
            if (!is_scalar($arg))
            {
                  // throwing an exception here if not scalar.
            }
        }
    }
    return true;
}

Is there any method to achieve this functionality? Please help me on this.

Either there is a static missing in the function declaration, or the self in self::validate_scalar is wrong. — colburton
– colburton, Commented Jun 13, 2014 at 12:21
array_walk_recursive Goes through every item recursively that is not an array and executes the callback/function on them. — Alexander
– Alexander, Commented Jun 13, 2014 at 12:28
hmm could you explain what you mean by "not going through all the elements of the array"? I tested the code as is and it catches everything PHP does not consider to be a scalar (array, resource, object). codepad.org/g9QR2eqJ — Useless Intern
– Useless Intern, Commented Jun 13, 2014 at 12:48
What's the question? Your original code works when I add a throw where the comment is. — Barmar
– Barmar, Commented Jun 13, 2014 at 12:48

Alexander · Accepted Answer · 2014-06-13 12:42:36Z

1

array_walk_recursive

You could use something like this:

<?php

$array = array(
    'kalle' => 'asdf', 
    'anka' => array(
        123, 
        54324, 
        new stdClass()
    )
);

array_walk_recursive($array, function ($item, $key) {
    if (!is_scalar($item)) {
        echo $key . " =>  : Is not scalar\n";
        return false;
    }
    echo $key . " =>  : Is scalar\n";
    return true;
});

array_walk_recursive ignores values that are arrays

output:

kalle =>  : Is scalar
0 =>  : Is scalar
1 =>  : Is scalar
2 =>  : Is not scalar

answered Jun 13, 2014 at 12:42

Alexander

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