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What is the difference, if any, between these methods of indexing into a php array:
$array[$index]
$array["$index"]
$array["{$index}"]
Thanks!
Started by svec on
, 10 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
If $index is a number, for example 10, the first line will evaluate to $array[10 that $array["$index"] is faster than $array[$index] See Best practices to optimize PHP code = "this is my string....
To the same string.
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Possible Duplicate:
In C arrays why is this true? a[5] == 5[a]
Is the possibility of both array[index] and index[array] a compiler feature or a language feature. How is the second one possible?
Started by Babiker on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
The compiler will turn
....
array]
into
*(index + array)
With the normal syntax it would turn
array[index]
into
*(array + index complicated ones because it's not something I'm ever likely to want to do.
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I have two arrays for a chess variant I am coding in java...I have a console version so far which represents the board as a 1D array (size is 32) but I am working on making a GUI for it and I want it to appear as a 4x8 grid, so I have a 2-dimensional ...
Started by Becky on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Every row in your 2D array is placed end to end in....
So it will be something like
singleDimIndex = array[0 * 8 + col would leave unnecessary gaps in the possible indexes.
More onto that to get your single array index.
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Ask your Facebook Friends
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I know there is a method for python list to return the first index of something
l = list(1,2,3) l.index(2) >>> 1
Is there something like that for numpy arrays?
Thanks for your help :)
Started by Casey on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
This will return....
If you need the index of the first occurrence of only one value , you this.
First_array > 50]
The nonzero method takes booleans, too:
index = numpy.nonzero(first_array item in the array of indices.
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OK here is what I would like to do. I have an array. What i want to do is make another array of the index values from the first one. Take the below I want to create and array from this :
Array ( [identifier] => ID [label] => HouseNum [items] =>...
Started by Arasoi on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Foreach($items[0] as $idx => $val) { $indexes[] = $idx; }
Or:
$indexes = array_keys($items[0]);
$indexes = array_keys($whatever['items'][0]);
http://us.php.net/manual/en/function.array-keys.php
$result = array....
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I don't know if this is a problem yet but wanted to start thinking about it.
Question:
" Are PHP array indexes case sensitive "?
Example:
$a=array("a"=>"Dog","b"=>"Cat","c"=>"Horse","A"=>"Dog","B"=>"Cat","C"=>"Horse"); print_r($a);
Results...
Started by Phill Pafford on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
$dogs = array('Dog' => 'Wuff', 'dog' => 'wuff.
That's easy enough to check on your own.
A capital letter, they are.
PHP array indexes act as hash tables in your example.
They are case sensitive.
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I am dynamically adding a bunch of controls to a form. Each control calls the same method, and in that method I need to know the array index of the the control that performed the action.
CheckBox[] myCB = new CheckBox[100]; int i; for (i = 0; i < 1...
Started by Adam Davis on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
You will incur; myCB.Length; i++) { int index = i; // This is very important, as otherwise i will // be captured for all:
CheckBox[] myCB = new CheckBox[100....
Maybe you can attach the index to the Tag.
Control's should have a Tag property.
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Is there a function which makes
$array['blue']='Color';
to
$array['Color']=blue'
And also, is there a limit on what characters can go inside an array index?
Started by Click Upvote on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
array_flip()
As for the type of characters that can be used as a key, there seems to be no limit, the only restriction is the script's memory limit (see " What is the max key size for an array.
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I have a class "Address" that has the following check:
if(thisAddress == null) thisAddress = new Address();
When the code is run I get "Index was outside the bounds of the array" on the first line. If I remove the IF statement I get the error on the second...
Started by TruthStands on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Has anything changed in the DB that you think can break the LINQ to SQL mapping?
Typically linq statements are executed lazily, or when they are used... .
Try recompiling the assembly that contains the usercontrol.
The code is not in sync with the binary.
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I have this $array in which the index key could appear in any random order:
array(4) { ["foo"]=> bool(false) ["index"]=> bool(false) ["bar"]=> bool(true) ["biff"]=> bool(false) }
Without adjusting the position of the elements or changing the...
Started by Jeff on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
This will work even if there is no 'index' key in the array..
Unset($array['index']);
Use:
unset($array['index']);
unset($array['index']); is what you're looking for.
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