Sometime we need an array form elements like this

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<input type="text" name="foo[]" value="a" />
<input type="text" name="foo[3]" value="b" />
<input type="text" name="foo[]" value="c" />
<input type="text" name="foo[7]" value="d" />

But some of that contain key some didn't. What will we actually get in php $_POST?

According to example above,

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<?php
echo '<pre>';
print_r($_POST['foo']);
echo '</pre>';

will output:

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Array
(
[0] => a
[3] => b
[4] => c
[7] => d
)

But let say the index is in string form

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<input type="text" name="foo[]" value="a" />
<input type="text" name="foo['3']" value="b" />
<input type="text" name="foo[]" value="c" />
<input type="text" name="foo['7']" value="d" />

will output:

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Array
(
[0] => a
['3'] => b
[1] => c
['7'] => d
)