php, mysql, arrays - if( x == 0 ) { }

Question

I have the following code

while($row = $usafisRSP->fetch_assoc())
{

 $hidden_keys  = array('Applicantid', 'unique_num', 'regs_time' ....);
 $hidden_fields = array_intersect_key($row, array_fill_keys($hidden_keys, NULL));

$hidden_values = array();

foreach ($hidden_fields as $key => $value) {
  // fill the values array using the values from fields array
  $hidden_values[$value] =  "$key = ".base64_decode($value)."
";


if(base64_decode($value)== 0)
{
  $hidden_values[$value] = "";
}

 echo $hidden_values[$value];

The question is about "if($hidden_values[$value] == 0)" ... Basically I want to do not display/echo the $hidden_values[$value] if it's value of $value is 0. Sometimes $value is 0 or some words like (23 avenue).

What exactly is the problem? You dont know how to check the contents of the array for 0 values before echoing? — diagonalbatman
– diagonalbatman, Commented Jan 9, 2011 at 14:48
What's the problem you're experiencing with your current code? Also, it looks like you're missing a couple of closing braces. — Matt Ball
– Matt Ball, Commented Jan 9, 2011 at 14:48

bob-the-destroyer · Accepted Answer · 2011-01-10 05:20:44Z

1

I think you ran into three catches with PHP type comparisons and equalities:

Any string not beginning with a number will always loosely equal 0. So basically, if(base64_decode($value)== 0) will likely always resolve to true, even if decoded $value is "Adam".
Return value of base64_decode is a string, so if 0 is the result, it will be string 0, not integer 0. This means if(base64_decode($value) === 0) wouldn't even work if decoded $value is "0". Another catch is base64_decode may return false on errors, again failing this strict equality check.
A non-empty string (other than "0") will always loosely equal true. So this is the only comparison you really need for your case.

I think this is what you want, replacing the last 5 lines...

if(base64_decode($value)) echo $hidden_values[$value];
else $hidden_values[$value] = "";

} // closing your for loop

edited Jan 10, 2011 at 5:20

answered Jan 10, 2011 at 4:40

bob-the-destroyer

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Comments

Bailey Parker · Accepted Answer · 2011-01-09 14:54:02Z

0

Is this what you're looking for?

foreach( $hidden_values as $value ) {
    if( $value !== 0 ) {
        echo $value;
    }
}

answered Jan 9, 2011 at 14:54

Bailey Parker

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