Issue
I am trying to create a class to handle arrays but I can’t seem to get array_map()
to work in it.
<?php
//Create the test array
$array = array(1,2,3,4,5,6,7,8,9,10);
//create the test class
class test {
//variable to save array inside class
public $classarray;
//function to call array_map function with the given array
public function adding($data) {
$this->classarray = array_map($this->dash(), $data);
}
// dash function to add a - to both sides of the number of the input array
public function dash($item) {
$item2 = '-' . $item . '-';
return $item2;
}
}
// dumps start array
var_dump($array);
//adds line
echo '<br />';
//creates class object
$test = new test();
//classes function adding
$test->adding($array);
// should output the array with values -1-,-2-,-3-,-4-...
var_dump($test->classarray);
This outputs
array(10) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) [7]=> int(8) [8]=> int(9) [9]=> int(10) }
Warning: Missing argument 1 for test::dash(), called in D:\xampp\htdocs\trainingdvd\arraytesting.php on line 11 and defined in D:\xampp\htdocs\trainingdvd\arraytesting.php on line 15
Warning: array_map() expects parameter 1 to be a valid callback, function '--' not found or invalid function name in D:\xampp\htdocs\trainingdvd\arraytesting.php on line 11 NULL
What am I doing wrong or does this function just not work inside classes?
Answer we found from sources
You are specifying dash
as the callback in the wrong way.
This does not work:
$this->classarray = array_map($this->dash(), $data);
This does:
$this->classarray = array_map(array($this, 'dash'), $data);
Read about the different forms a callback may take here.
Answered By – Jon
This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0