Identical arrays vs equal arrays
There is a small problem when comparing arrays -- you can find arrays where array_diff comes back empty and yet, the arrays are not identical.
<?php
$array1 = array(
'foo' => 'foo',
'bar' => 'bar',
);
$array2 = array(
'bar' => 'bar',
'foo' => 'foo',
);
var_dump(array_diff($array1, $array2)); // Result: empty array.
var_dump($array1 == $array2); // Result: true.
var_dump($array1 === $array2); // Result: false.
?>The behavior is logical when the arrays (seemingly) have no keys.
<?php
$array1 = array(
'foo',
'bar',
);
$array2 = array(
'bar',
'foo',
);
var_dump(array_diff($array1, $array2)); // Result: empty array.
var_dump($array1 == $array2); // Result: false.
var_dump($array1 === $array2); // Result: false.
?>Since
<?php
$array1[0] != $array2[0];
?>but slightly less so when the arrays are associative. In the first example:
<?php
$array1['foo'] === $array2['foo'];
$array1['bar'] === $array2['bar'];
?>Moral of the story: be careful with using identical on associative arrays.
Comments
hehe
Does your brain see difference in ordering? it may have same keys and values but ordering is not the same, so not identical. When you do foreach, it will be different first.
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Yes, because array_diff "Returns an array containing all the entries from array1 that are not present in any of the other arrays." -- it says nothing about the arrays being identical or not. array_diff can operate on more than one array even!
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it may have same keys and values but ordering is not the same, so not identical. When you do foreach, it will be different first.
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There is a little issue when evaluating arrays -- you may discover arrays where array_diff comes back clear and yet, the arrays are not similar. christmas quotes in spanish | christmas quotes for boss
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Arrays store large number of
Arrays store large number of elements.When array comparison is required the array_diff can be used,but sometimes it may give clear output but still both arrays may not be similar...we have to ensure the output is proper...
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Its always important to use
Its always important to use the diff_array because array store large number of elements.its interesting to see a strange result that can come out in case of diff_array is used.I dint come across this program when i was practicsing arrays.
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Arrays store large number of
Arrays store large number of values,so one needs to be know the difference between the arrays when comparing two arrays of same size.But the output may be strange with some of the identical and associative arrays,so one has to be careful with associative and identical arrays.
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