How to access first level keys of a 2d array with a foreach loop? [duplicate]
You can access your array keys like so: foreach ($array as $key => $value)
key
How to filter an associative array comparing keys with values in an indexed array?
With array_intersect_key and array_flip: var_dump(array_intersect_key($my_array, array_flip($allowed))); array(1) { [“foo”]=> int(1) }
What is the max key size for an array in PHP?
It seems to be limited only by the script’s memory limit. A quick test got me a key of 128mb no problem: ini_set(‘memory_limit’, ‘1024M’); $key = str_repeat(‘x’, 1024 * 1024 * 128); $foo = array($key => $key); echo strlen(key($foo)) . “<br>”; echo strlen($foo[$key]) . “<br>”;
Easiest way to check for an index or a key in an array?
To check if the element is set (applies to both indexed and associative array) [ “${array[key]+abc}” ] && echo “exists” Basically what ${array[key]+abc} does is if array[key] is set, return abc if array[key] is not set, return nothing References: See Parameter Expansion in Bash manual and the little note if the colon is omitted, the … Read more
How do I make a composite key with SQL Server Management Studio?
Open the design table tab Highlight your two INT fields (Ctrl/Shift+click on the grey blocks in the very first column) Right click -> Set primary key
Get dictionary value by key
It’s as simple as this: String xmlfile = Data_Array[“XML_File”]; Note that if the dictionary doesn’t have a key that equals “XML_File”, that code will throw an exception. If you want to check first, you can use TryGetValue like this: string xmlfile; if (!Data_Array.TryGetValue(“XML_File”, out xmlfile)) { // the key isn’t in the dictionary. return; // … Read more
Catch keypress with android
You can either handle key events from a view or in general for your whole application: Handle onKey from a View: public boolean onKey(View v, int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_ENTER: /* This is a sample for handling the Enter button */ return true; } return false; } Remember to implement … Read more
Android: automatically choose debug/release Maps v2 api key?
Using build.gradle buildTypes { debug { buildConfigField(“String”, “map_api_key”, “\”your debug map api key here\””) } release { buildConfigField(“String”, “map_api_key”, “\”your release map api key here\””) } } I solved this issue using this steps: In Google Developer API Console Click on Create New Android key… In cmd.exe/Terminal: keytool -list -v -keystore mystore.keystore Password: android Now … Read more
switching keys and values in a dictionary in python [duplicate]
For Python 3: my_dict2 = {y: x for x, y in my_dict.items()} For Python 2, you can use my_dict2 = dict((y, x) for x, y in my_dict.iteritems())
Accessing dict_keys element by index in Python3
Call list() on the dictionary instead: keys = list(test) In Python 3, the dict.keys() method returns a dictionary view object, which acts as a set. Iterating over the dictionary directly also yields keys, so turning a dictionary into a list results in a list of all the keys: >>> test = {‘foo’: ‘bar’, ‘hello’: ‘world’} … Read more