PHP: get array value as in Python?

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In Python I can use "get" method to get value from an dictionary without error.

a = {1: "a", 2: "b"}
a[3] # error
a.get(3, "") # I got empty string.

So I search for a common/base function that do this:

function GetItem($Arr, $Key, $Default){
    $res = '';
    if (array_key_exists($Key, $Arr)) {
        $res = $Arr[$Key];
    } else {
        $res = $Default;
    }
    return $res;
}

Have same function basicly in PHP as in Python?

Thanks: dd

isset() is typically faster than array_key_exists(). The parameter $default is initialized to an empty string if omitted.

function getItem($array, $key, $default = "") {
  return isset($array[$key]) ? $array[$key] : $default;
}

// Call as
$array = array("abc" => 123, "def" => 455);
echo getItem($array, "xyz", "not here");
// "not here"

However, if an array key exists but has a NULL value, isset() won't behave the way you expect, as it will treat the NULL as though it doesn't exist and return $default. If you expect NULLs in the array, you must use array_key_exists() instead.

function getItem($array, $key, $default = "") {
  return array_key_exists($key, $array) ? $array[$key] : $default;
}

array_slice - Manual, isset() is typically faster than array_key_exists() . The parameter $default is initialized to an empty string if omitted. function getItem($array, $key, $default  You can use index arrays, simply pass your ind_pos as an index argument as below: a = np.array([0,88,26,3,48,85,65,16,97,83,91]) ind_pos = np.array([1,5,7]) print(a[ind_pos]) # [88,85,16] Index arrays do not necessarily have to be numpy arrays, they can be also be lists or any sequence-like object (though not tuples).

Not quite. This should behave the same.

function GetItem($Arr, $Key, $Default = ''){
    if (array_key_exists($Key, $Arr)) {
        $res = $Arr[$Key];
    } else {
        $res = $Default;
    }
    return $res;
}

The first line in your function is useless, as every code path results in $res being overwritten. The trick is to make the $Default parameter optional as above.

Keep in mind that using array_key_exists() can cause significant slowdowns, especially on large arrays. An alternative:

function GetItem($Arr, $Key, $Default = '') {
  return isset($Arr[$Key]) ? $Arr[$Key] : $Default;
}

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There is no base function to do that in my mind.

Your GetItem is a good way to do what you wanna do :)

array_column - Manual, Return Values ¶. Returns the key for needle if it is found in the array, FALSE otherwise. If needle is found in haystack more than once, the first matching key is​  Python Pandas DataFrame Exercises, Practice and Solution: Write a Pandas program to get the powers of an array values element-wise.

Yes. or

function GetItem($Arr, $Key, $Default) {
  return array_key_exists($Key, $Arr)
      ? $Arr[$Key]
      : $Default;
}

range - Manual, The column of values to return. This value may be an integer key of the column you wish to retrieve, or it may be a string key name for an associative array or  NumPy: Array Object Exercise-160 with Solution. Write a NumPy program to find the k smallest values of a given numpy array. Sample Solution: . Python Code:

php7 is out for a long time now so you can do

$Arr[$Key] ?? $default

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PHP function.array-values in Python, This inbuilt function of PHP is used to search for a particular value in an array, and if Return Value: As already mentioned, the function returns the key of the  Array is created in Python by importing array module to the python program. Then the array is declared as shown eblow. from array import * arrayName = array(typecode, [Initializers]) Typecode are the codes that are used to define the type of value the array will hold.

Comments
  • why you need a function to get the value using a key of the array. $a['key'] what is wrong with this
  • @zod: If the key doesn't exist, you get a PHP error. Using a function like the ones in the answers below allows you to get a default value instead of an error message.
  • I made another helper function which is simpler and needs fewer arguments: stackoverflow.com/a/25205195/1890285