PHP checking $_POST

I have some form fields that when a form is submitted creates开发者_C百科 an array within the $_POST, I needing to check the this array has atleast 4 keys, how can I check that? I have no idea

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try:

<?php 
if(count($_POST) >= 4):
//Do your stuff
else:
//Do your error stuff
endif;

If you want to check an array within $_POST as apose to $_POST itself use count($_POST['name_of_key_to_array_you_want_to_count'])

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First, to make your work easier, you should change input name into array version. Something like this should work:

<input type='text' name='data[]' value='' />

Then, PHP will do it's magic and all you have to do is:

echo count($_POST['data']);

This is because your data[] form field is changed into array.

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Use array_keys and count:

echo count(array_keys($_POST));

Or simply:

echo count($_POST);

because keys are same in number as items.

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The count() function returns the length of an array.