The PHP Manual does not detail this in the Portuguese version of the array_unique function, but in the English version, it shows that this function has a second parameter.
See the "skeleton" of this function - taken from PHP Manual, array_unique, in English :
array array_unique ( array $array [, int $sort_flags = SORT_STRING ] )
The array_unique function internally uses a comparison method, which by default values are treated as strings , and so the error is generated.
So you have to change this form of comparison. Instead of SORT_STRING we will use SORT_REGULAR .
Example:
$dados = json_decode(($_POST['dados']));
$dados_arr = array_unique($dados, SORT_REGULAR); //linha 10
print_r($dados_arr);
By adding the constant SORT_REGULAR to the second parameter of array_unique , it is possible to work with other values, regardless of the type.
We can even use SORT_REGULAR to make a collection of unique objects .
For more information, see the possible flags that can be used with array_unique .
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SORT_REGULAR - compare items normally (does not change types)
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SORT_NUMERIC - compare items numerically
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SORT_STRING - compare items as strings
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SORT_LOCALE_STRING - compares items as strings, based on current location.
