array php looping value and key

Question

I'm trying to check value's of keys :

$errorArray=array();
 $naamarray["naam"]=false;
 $naamarray["voornaam"]=false;
 $naamarray["adres"]=false;
 $naamarray["woonplaats"]=false;
 $naamarray["postcode"]=false;
 $naamarray["telefoonnummer"]=false;
 $naamarray["geboortedatum"]=false;
 $naamarray["adres"]=false;
 $naamarray["wachtwoord"]=false;
 $naamarray["email"]=false;
 $naamarray["email"]=true;

  foreach($naamarray as $key => $value){
        if($value == false){
            array_push($errorArray,$key);
            echo $key;
            echo $value;
        }
 }

But the value never get's shown, what is my mistake ?

try echoing the key and value before the if statment to see what you get — Naftali
– Naftali, Commented Jul 13, 2011 at 18:47

Sarfraz · Accepted Answer · 2011-07-13 18:55:00Z

4

The false is boolean type in php. Since you have assigned that to your array values, you need to use var_dump to see actual value for your keys :

var_dump($key);

See the var_dump manual for more info

You may want to assign string values to your array values instead.

edited Jul 13, 2011 at 18:55

answered Jul 13, 2011 at 18:49

Sarfraz

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3 Comments

Zimzat Over a year ago

Why strings? From what I can tell of the context making them strings wouldn't benefit anything, as you're not going to just show 'false' or 'true' to the user for a form validation. Using a boolean is appropriate, as it takes less space and correctly evaluates as true or false in comparisons ($boolean) or (!$boolean). Using strings means you have to also worry about case-sensitivity, and then we start going down the True, False, FileNotFound enumeration slope. thedailywtf.com/Articles/What_Is_Truth_0x3f_.aspx

Sarfraz Over a year ago

@Zimzat: I am not sure about OP's requirements. If his requirement is like what you say then off course using boolean is the way to go. If he just wants to check what goes inside the keys, he can simply use string values. Otherwise, var_dump is needed to see false and true values.

Zimzat Over a year ago

You can easily see a true value as it casts to the string of 1. The false value is the only difficult part. Alternatively, var_export can also be used to see boolean values in their native form. For the OP, I'd recommend simply var_dump the entire errorArray after done, rather than during.

Howard · Accepted Answer · 2011-07-13 18:50:56Z

1

Please note: echo false does not echo anything.

answered Jul 13, 2011 at 18:50

Howard

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Comments

genesis · Accepted Answer · 2011-07-13 18:52:23Z

1

because they are always false, it means NOTHING

echo false;

gives you

answered Jul 13, 2011 at 18:52

genesis

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Comments

SeanCannon · Accepted Answer · 2011-07-13 18:51:04Z

0

Try this:

$errorArray=array();
 $naamarray["naam"]='false';
 $naamarray["voornaam"]='false';
 $naamarray["adres"]='false';
 $naamarray["woonplaats"]='false';
 $naamarray["postcode"]='false';
 $naamarray["telefoonnummer"]='false';
 $naamarray["geboortedatum"]='false';
 $naamarray["adres"]='false';
 $naamarray["wachtwoord"]='false';
 $naamarray["email"]='false';
 $naamarray["email"]='true';

  foreach($naamarray as $key => $value){
        if($value == 'false'){
            array_push($errorArray,$key);
            echo $key;
            echo $value;
        }
 }

answered Jul 13, 2011 at 18:51

SeanCannon

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3 Comments

SeanCannon Over a year ago

Why the downvote? Sure I wouldn't recommend anybody use strings as bools but var_dump isn't exactly UI friendly, maybe he wants to display it in a nice format, and this will allow him to do that.

Zimzat Over a year ago

Rather than change the internal value to a string (binding yourself to a specific value, making changing or checking it elsewhere that much more difficult), it would be easier to change the value at the time of output, like this: echo ($value) ? 'true' : 'false';

Zimzat Over a year ago

Alternatively: var_export($value); Still really only good for debug or system check pages. Not user friendly for form validation output.

madflow · Accepted Answer · 2011-07-13 18:53:09Z

0

You cannot echo a boolean variable in PHP. If you just want to debug - use

var_dump($value);

instead.

answered Jul 13, 2011 at 18:53

madflow

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1 Comment

Zimzat Over a year ago

Sure you can. Echoing a boolean value simply casts it to string first. A true value casts to the string '1' and a false value casts to the string '' (blank).

user827080 · Accepted Answer · 2011-07-13 18:53:18Z

0

Funny, the keys do echo on my home server. But then again; echo'ing bool false will not output anything.

answered Jul 13, 2011 at 18:53

user827080

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