Find and Change values in an array

[MasterACE14]

Good Evening,

 

I'm having no luck in something that I'm sure is incredibly simply...

 

If I have an array like the following...

$array = array(15,22,0,43,0,6);

How can I find and replace all the zeros with a one?

 

Regards, Ace

[mikesta707]

you could loop through the array, and replace all zero's with a one like so

foreach($array as $key=>$value){
if ($value==0)
$array[$key] = 1;
}//end foreach

[MasterACE14]

you could loop through the array, and replace all zero's with a one like so

foreach($array as $key=>$value){
if ($value==0)
$array[$key] = 1;
}//end foreach

Thanks! I just worked that out before you posted.

 

I have another related problem. If I use...

$values = array_count_values($array);
print_r($values);

I'm getting every value in the array except for the last one? any ideas why?

 

EDIT: Sorry stupid question. there's two 0's in the array, so I'm one less key/value.

 

[wildteen88]

Or you can use array_map

function convertZero($value)
{
     return ($value === 0) ? 1 : $value;
}

$array = array(15,22,0,43,0,6);
$array = array_map('convertZero', $array);

 

[Dathremar]

See http://www.php.net/manual/en/function.array-count-values.php for explanation of how array_count_values works.

 

As if You need the number of elements in the array just use count($array);

[mikesta707]

you could loop through the array, and replace all zero's with a one like so

foreach($array as $key=>$value){
if ($value==0)
$array[$key] = 1;
}//end foreach

Thanks! I just worked that out before you posted.

 

I have another related problem. If I use...

$values = array_count_values($array);
print_r($values);

I'm getting every value in the array except for the last one? any ideas why?

 

Thanks!

 

 

can you post the actual array you are using, and the actual result. array_count_values() gives you a sort of frequency histogram (in array form) of the input array.

[MasterACE14]

Ultimately what I'm trying to do is, create a function that can take an array of X values and multiply them by F values(frequency of X). The problem with using array_count_values(); I have less key/values in the F array. Any ideas? Thanks!

[Dathremar]

Ultimately what I'm trying to do is, create a function that can take an array of X values and multiply them by F values(frequency of X). The problem with using array_count_values(); I have less key/values in the F array. Any ideas? Thanks!

 

read my replay

[MasterACE14]

Ultimately what I'm trying to do is, create a function that can take an array of X values and multiply them by F values(frequency of X). The problem with using array_count_values(); I have less key/values in the F array. Any ideas? Thanks!

 

read my replay

ahhhh, completely wasn't seeing the key. *bangs head on desk* thanks heaps!

 

Cheers.

[mikesta707]

Ultimately what I'm trying to do is, create a function that can take an array of X values and multiply them by F values(frequency of X). The problem with using array_count_values(); I have less key/values in the F array. Any ideas? Thanks!

 

As dathremar has said, you should probably read the manual entry for that function. Unless you have all unique values (in which case the frequency of each value would be 1) Then the number of values in F will always be smaller than the number of values in X. I'll give you an example.

$array = array(1,2,3,4,5,1,2,4,5,6);
print_r(array_count_values($array));

 

the output of that code would be

[1] => 2
[2] => 2
[3] => 1
[4] => 2
[5] => 2
[6] => 1

 

Now, for what you ultimiately want to do, i'm a little confused. Do you want to take each value in X, and multiply it by its frequency? Or something else? if the former, you could do something like this

$array = array(...);
$frequency = array_count_values($array);

foreach($array as $key=>$value){
$newValue = $value * $frequency[$value];
$array[$key] = $newValue;
}//end foreach

 

Hope this helps

[MasterACE14]

Now, for what you ultimiately want to do, i'm a little confused. Do you want to take each value in X, and multiply it by its frequency? Or something else? if the former, you could do something like this

$array = array(...);
$frequency = array_count_values($array);

foreach($array as $key=>$value){
$newValue = $value * $frequency[$value];
$array[$key] = $newValue;
}//end foreach

 

Hope this helps

 

that's exactly what I'm trying to do, thanks a million Mike! appreciated.

 

Kind Regards, Ace