Hello,
I've an array with different type of values: int, null, strings, arrays. I'm trying to remove nulls and empty strings, but I want to save ints, even when it equals to zero, so I tried with array_filter(), by default it will remove 0, '' and null, but by applying a callback it's possible to apply own rules. So I made few tests, and I'm getting unexpected results. The switch method will remove null and 0, while the if statements will remove the empty string and null, as I wanted. Now, I can use the if statements, but I don't understand why there's this difference between the two methods, even by removing the breaks it won't change results.
Any ideas why this is happening?
<?php
$array = array(
0, # int
null, # null
'', # empty string
'hello', # string
array('world') # array
);
$r['original'] = $array;
$r['switch_method'] = array_filter($array, function($value) {
switch($value)
{
case is_string($value):
return ! empty($value);
break;
case is_int($value):
return true;
break;
case is_null($value):
return false;
break;
case is_array($value):
return count($value);
break;
default:
return false;
}
});
$r['ifelseif_method'] = array_filter($array, function($value) {
if(is_string($value))
{
return ! empty($value);
}
elseif(is_int($value))
{
return true;
}
elseif(is_array($value))
{
return true;
}
elseif(is_null($value))
{
return false;
}
else
{
return false;
}
});
var_dump($r);
echo PHP_EOL;
This is the output:
array(3) {
["original"]=>
array(5) {
[0]=>
int(0)
[1]=>
NULL
[2]=>
string(0) ""
[3]=>
string(5) "hello"
[4]=>
array(1) {
[0]=>
string(5) "world"
}
}
["switch_method"]=>
array(3) {
[2]=>
string(0) ""
[3]=>
string(5) "hello"
[4]=>
array(1) {
[0]=>
string(5) "world"
}
}
["ifelseif_method"]=>
array(3) {
[0]=>
int(0)
[3]=>
string(5) "hello"
[4]=>
array(1) {
[0]=>
string(5) "world"
}
}
}
Thank you for your attention.
