CODEWITHSUNDEEP
phparrays
Major Productions
Major Productions

Reputation: 6042

Replacing empty values with NULL in $_POST

I'm trying to replace empty field values with NULL, but can't seem to figure out how to do it. I've tried array_map, array_filter, and array_walk, but to no avail. Example:

function replaceWithNull($var)
{
    if (empty($var) || $var == ' ') {
        $var = "NULL";
    }
}

array_walk($_POST, "replaceWithNull");

Instead, it remains empty/blank. What am I missing?

Upvotes: 2

Views: 1164

Answers (3)

Olaf Erlandsen
Olaf Erlandsen

Reputation: 6036

hey guys look this code:

config.php

<?php
if( is_array( $_POST ) and count( $_POST ) > 0 )
{
    foreach( $_POST as $key => $value )
    {

        if( is_array( $value ) )
        {
            foreach( $value as $k => $val )
            {
                if( is_string( $val ) )
                {
                    if( empty($val) OR strlen(preg_replace("/(\s+)?/", $val)) == 0 )
                    {
                        $_POST[$key][$k] = null;
                    }
                }
            }
        }else{
            if( empty($value) OR strlen(preg_replace("/(\s+)?/", $value)) == 0 )
            {
                $_POST[$key] = null;
            }
        }


    }
}
?>

TEST:

<?php
var_dump( $_POST );
exit;
?>

myApp.php

<?php
include( 'config.php');
//.... your code here....
if(is_null( $_POST['firstname'] ))
{
    echo 'hey men! error!';
}
?>

Upvotes: -2

scravy
scravy

Reputation: 12283

You have to use references for argument passing in order to alter the elements in the array:

function replaceWithNull(&$var)
{
    ...
}

Otherwise you will be changing only a copy of the variable.

Read about it here: http://www.php.net/manual/en/functions.arguments.php

Upvotes: 6

user142162
user142162

Reputation:

You're only modifying the local copy of the variable. You must pass the value by reference to modify the value in the actual array:

function replaceWithNull(&$var)
{
    if (empty($var) || $var == ' ') {
        $var = "NULL";
    }
}

Upvotes: 5

Related Questions