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Generate all permutations of a list without adjacent equal elements
...ount else heapq.heappop(heap)
yield key
count += 1
for index in xrange(-count):
yield key
>>> a = [1,2,3,3,2,2,1]
>>> list(nonadjacent(a))
[2, 1, 2, 3, 1, 2, 3]
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How to delete a certain row from mysql table with same column values?
... table. But if there is not.
I will give other ways:
By creating Unique index
I see id_users and id_product should be unique in your example.
ALTER IGNORE TABLE orders ADD UNIQUE INDEX unique_columns_index (id_users, id_product)
These will delete duplicate rows with same data.
But if you st...
ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage? [closed]
...essly expressed through JSON DSL.
Solr is also a solution for exposing an indexing/search server over HTTP, but I would argue that ElasticSearch provides a much superior distributed model and ease of use (though currently lacking on some of the search features, but not for long, and in any case, th...
Multiple file upload in php
...st multiple
In your PHP file use the syntax "$_FILES['inputName']['param'][index]"
Make sure to look for empty file names and paths, the array might contain empty strings. Use array_filter() before count.
Here is a down and dirty example (showing just relevant code)
HTML:
<input name="upload...
PHP Fatal error: Using $this when not in object context
...
In my index.php I'm loading maybe
foobarfunc() like this:
foobar::foobarfunc(); // Wrong, it is not static method
but can also be
$foobar = new foobar; // correct
$foobar->foobarfunc();
You can not invoke method ...
Binary Data in MySQL [closed]
...Y will work most of the time. They have the added benefit of being able to index on them.
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If isset $_POST
... I know this is old answer but first method can cause undefined index notice.
– ICE
Nov 28 '18 at 0:57
...
Get the client IP address using PHP [duplicate]
...alse if the variable isn't set, where $_SERVER will error with "undefined index" if the variable isn't set.
– Michael
Feb 7 '14 at 1:45
4
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Why are variables “i” and “j” used for counters?
...rom mathematics: the summation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ... xn, then an arbitrary one...
startsWith() and endsWith() functions in PHP
...allocations (substr), etc. The 'strpos' and 'stripos' functions return the index of the first occurrence of $needle in $haystack:
function startsWith($haystack,$needle,$case=true)
{
if ($case)
return strpos($haystack, $needle, 0) === 0;
return stripos($haystack, $needle, 0) === 0;
...