在PHP中为多个数组分配相同的key => value对

Question

I'm trying to write a function that assigns the same key => value pair to multiple arrays. But the assignment doesn't occur.

<?php

// for debugging
error_reporting(E_ALL);

// arrays is an array of reference arrays
function assignKeyValueToArrays($arrays, $key, $value) {

    if(!is_scalar($key) || !is_array($arrays)) {
        return false;
    }

    foreach($arrays as $array) {
        if(!is_array($array)) return false;
        echo "setting $key to $value";
        $array[$key] = $value;
    }

}

$s = array();
$t = array();

assignKeyValueToArrays(array(&$s, &$t), "a", "blahblah");

// should print array(1) {"a" => "blahblah"} but both print array(0) {}
var_dump($s);
var_dump($t);

?>

The context for this is that I have a script which is doing database queries and assigns keys to both a temporary $queryParams array and also a $jsonResponse array. I could just do two assignments but I wanted a more general solution that could handle more arrays.

Answer 1

You should pass $array to the foreach loop by reference too, like &$array.

Checkout this Demo