转换变量中的数组并操纵它以在php中创建XML文件

Question

    $bday = $f['date_of_birth']; //it outputs-> 20102016

So I tried using preg_split() or even explode() but was of no help

    $str = $bday;
    $chars = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);
    print_r($chars[0]);

I want to use $bday as a nodeValue in DOMDocument to create XML file

    $doc = new DOMDocument();
    $doc->formatOutput = true;

    $root = $doc->createElement('StudentDetails');
    $root = $doc->appendChild($root);

    $ele1 = $doc->createElement('DateOfBirth');
    $ele1->nodeValue=$bday;
    $root->appendChild($ele1);

I want my XML output to be like

    <?xml version="1.0"?>
    <StudentDetails>
         <DateOfBirth>20/10/2016</DateOfBirth>
    </StudentDetails> 

Answer 1

If the date is always DDMMYYYY you could insert slashes with preg_replace.

$bday = preg_replace('/(\d\d)(\d\d)(\d\d\d\d)/', "$1/$2/$3", $bday);