I want to do something like this:
class Cls {
function fun($php) {
return 'The rain in Spain.';
}
}
$ar = array(1,2,3);
$instance = new Cls();
print_r(array_map('$instance->fun', $ar));
// ^ this won't work
but the first argument to array_map is supposed to be the name of the function. I want to avoid writing a wrapper function around $instance->fun, but it doesn't seem like that's possible. Is that true?
Yes, you can have callbacks to methods, like this:
array_map(array($instance, 'fun'), $ar)
see the callback type in PHP's manual for more info
array('Class_Name', 'functionName') as the parameter. If it's the current class' parent class, then using array($this, 'functionName') should most likely work.
$instance is undefined and $this uses the the object I'm calling array_map from. Could not find any way (except with a wrapper function) to refer to the objects in my array (I'm on php 5.4.7).You can also use
array_map('Class::method', $array)
syntax.
array_map('self::method', $array)Actually, you need to know the definition of Callback, please kindly refer to the following code:
<?php
// An example callback function
function my_callback_function() {
echo 'hello world!';
}
// An example callback method
class MyClass {
static function myCallbackMethod() {
echo 'Hello World!';
}
}
$myArray = [1, 2, 3, 4];
// Type 1: Simple callback
array_map('my_callback_function', $myArray);
// Type 2: Static class method call
array_map(array('MyClass', 'myCallbackMethod'), $myArray);
// Type 3: Object method call
$obj = new MyClass();
array_map(array($obj, 'myCallbackMethod'), $myArray);
// Type 4: Static class method call (As of PHP 5.2.3)
array_map('MyClass::myCallbackMethod', $myArray);
// Type 5: Relative static class method call (As of PHP 5.3.0)
class A {
public static function who() {
echo "A\n";
}
}
class B extends A {
public static function who() {
echo "B\n";
}
}
array_map(array('B', 'parent::who'), $myArray); // A
?>
It worked for me as follows
<?php
class ExcelAutoFilterController extends Controller
{
public function transpose($value):array
{
return [$value];
}
public function generateExcelDropdownDownload($file = 'helloWorld.xlsx')
{
$countries = [0 => "Algeria"1 => "Angola"2 => "Benin"3 => "Botswana"4 => "Burkina"5 => "Burundi"6 => "Cameroon"7 => "Cape Verde"8 => "Central African Republic"9 => "Chad"10 => "Comoros"11 => "Congo"12 => "Congo, Democratic Republic of"13 => "Djibouti"14 => "Egypt"15 => "Equatorial Guinea"16 => "Eritrea"17 => "Ethiopia"18 => "Gabon"19 => "Gambia"20 => "Ghana"21 => "Guinea"22 => "Guinea-Bissau"23 => "Ivory Coast"24 => "Kenya"25 => "Lesotho"26 => "Liberia"27 => "Libya"28 => "Madagascar"29 => "Malawi"30 => "Mali"31 => "Mauritania"32 => "Mauritius"];
$countries = array_map('self::transpose', $countries);
}
