My str_putcsv implementation, probably could be better but behaves the same as fputcsv, except it always wraps with ""

str_putcsv.php

<?php
/**
 * Takes an array and returns a string of csv in the same format that fputcsv
 * would; but every one is wrapped rather than just ones that require it
 * because str_getcsv will still parse itcorrectly
 *
 * NOTE: That currently str_getcsv and fgetcsv fail with encaser being any
 * value other than " this holds for if its encoded with fputcsv as well.
 *
 * @param array $fields an array of string values to encode in csv
 * @param character $delimiter the character to use instead of a comma
 * @param character $encaser the character wrap itself around, this is how
 * fputcsv "escapes" the quotes or whatever value you need escaped that the
 * input might not have escaped. CURRENTLY MUST BE "
 * @param character $escaper the character to use as an escape, prevents the next
 * character from being encased
 * @return string the formatted string
 */
function str_putcsv(array $fields, $delimiter = ",", $encaser = '"', $escaper = '\\') {
    $result = "";
    foreach ($fields as $field) {
        //rather than search the string everytime incase it might contain various characters, just wrap it anyway
        //php does it in C but we ain't got that kinda speed
        $part  = '"';
        $chars = \str_split($field);
        $size  = \count($chars);
        for ($ctr = 0; $ctr < $size; $ctr++) {
            //If we need to encase and the prev one isn't the escape character
            if (($chars[$ctr] === $encaser) && ($ctr === 0 || $chars[$ctr - 1] !== $escaper)) {
                $part .= $encaser;
            }
            $part .= $chars[$ctr];
        }
        $part .= '"' . $delimiter;
        $result .= $part;
    }
    //chop off the last delimiter
    return \substr($result, 0, -1);
}