检查文件中的int或字符串

Question

I'm trying to open an input file containing a variety of data type. Something like this:

Woof 
50 
Meow 
30 
//...

And I'm not quite sure how to do it. I've googled for ways to do it and I found something like ctype_digit, is_digit, and is_string. I tested them out and I'm still not getting the expected result.

This is the code snippet I am using:

// Sorts the array by requested data type
function sortArray($anArray, $dataType){

    $array_string = array();
    $array_int = array();

    foreach ($anArray as $element){
        if (ctype_digit($element)){
            array_push($array_int, $element);
        }
        elseif (ctype_alpha($element)){
            array_push($array_string, $element);
        }
    }

    if ($dataType == "int"){
        return $array_int;
    }
    elseif ($dataType == "String"){
        return $array_string;
    }
} // end function sortArray($anArray, $dataType)

Can anyone help point out why it's not working?

Answer 1

Well your function seems way to complicated. Just filter all other values which you don't want with array_filter() out like this:

<?php

    //As an example to get the data from the file nice and quick
    $lines = array_map("trim", file("test.txt", FILE_IGNORE_NEW_LINES));

    function filterArrayByType($arr, $type = "int") {
        return array_filter($arr, ($type === "int"?"ctype_digit":"ctype_alpha"));
    }

    $result = filterArrayByType($lines, "string"); //"int"
    print_r($result);

?>

output:

Array ( [0] => Woof [2] => Meow )  //Array ( [1] => 50 [3] => 30 )