Changing the format of an array

licensetokode

Hi folks,

Got a question regarding arrays, hoping someone can help.

I have an array which is being output in this format when I do var_dump to it:

array(16) { 
[3]=> string(1) "0" 
[4]=> string(1) "1" 
[5]=> string(1) "0" 
[6]=> string(1) "0" 
[7]=> string(1) "0" 
[8]=> string(1) "0" 
[9]=> string(1) "0" 
[10]=> string(1) "0" 
[11]=> string(1) "0" 
[12]=> string(1) "1" 
[13]=> string(1) "0" 
[14]=> string(1) "0" 
[15]=> string(1) "1" 
[16]=> string(1) "0" 
[17]=> string(1) "1" 
[18]=> string(1) "1" 
}

Basically I'm trying to convert it so that it comes out like the array below.

[18]=> string(1) "1"
For each item the number in the square brackets is a database value, I want to store this as an INT value for the ones which are marked "1" is disregard the ones marked "0"

array(2) { 
[0]=> int(105) 
[1]=> int(125) 
}

I can't change the way the array is being created so is it possible to convert it somehow?

anoopmail

Confusing..From where does 125 comes? I could not see it in the first array. Could you rephrase the question?

Ashley_Sheridan

As far as I can work out, your current array keys you need as values in a new array only where the current array values are 1, am I right in my understanding?

If so, something like this should do the trick:

$new_array = array();
foreach($old_array as $key => $value)
{
    if($value == '1') // note the quotes here
        $new_array[] = intval($key);
}

bradgrafelman

You could even simplify it further by noting that '1' will equate to boolean true while '0' equates to boolean false, thus making [man]array_filter/man and [man]array_keys/man candidates for the job. In other words, Ashley's code above could be reduced down to:

$new_array = array_keys( array_filter( $old_array ) );

Ashley_Sheridan

Interesting, I didn't realise that array_filter would consider the string '0' to equate to false. I knew that the integer 0 would, but for some reason I was thinking the string was different.

bradgrafelman

There are actually several different types of values that equate to false after PHP does its type juggling route; see Converting to boolean in the PHP manual for a list of said values.