how can I get my php array data to persist? - php

Question

When I query the data within the foreach loop it works, but makes a duplicate for each pass in the loop. I try to var_dump it anywhere else outside the loop and the data isn't there. Why won't my data persist outside the forEach loop?
<?php
$old_array = [10-2, 13=>"3452", 4=>"Green",
5=>"Green", 6=>"Blue", "green"=>"green",
"two"=>"green" ,"2"=>"green" , "rulebreak" =>"GrEeN",
"ninja"=>" Green ", ["blue" => "green", "green"=>"green", 2 => "itsGreen"] ];
$newArray = array();
function filter_Green($array) {
$find = "green";
$replace = "not green";
/* Same result as using str_replace on an array, but does so recursively for multi-dimensional arrays */
/* found here:
if (!is_array($array)) {
/* Used ireplace so that searches can be case insensitive */
return str_ireplace($find, $replace, $array);
}
foreach ($array as $key => $value) {
$newArray[$key] = $value;
if ($key == "green") {
$newArray[$key] = "not green";
}
if ($value == "green") {
$newArray[$value] = "not green";
}
}
return $newArray;
}
filter_Green($old_array);
var_dump($newArray);
?>
Expectation: When I run the function it should replace all instances of "green" with "not green" and save those into a $newArray. I have it returning $newArray but even then it doesn't seem to match up that the values are being saved into the newArray, hence why I'm doing var_dump to check if it's even working (it appears to not be)
Results: as it is setup, I get an empty array returned to me...It seems to work somewhat if I move var_dump($newArray) to within the foreach loop but that then duplicates the data for each pass.

Answer 1

if you want var_dump $newArray out side the function then you should declare $newArray as global in your function
<?php
$old_array = [10-2, 13=>"3452", 4=>"Green", 5=>"Green", 6=>"Blue", "green"=>"green", "two"=>"green" ,"2"=>"green" , "rulebreak" =>"GrEeN", "ninja"=>" Green ", ["blue" => "green", "green"=>"green", 2 => "itsGreen"] ];
$newArray = array();
function filter_Green($array) {
global $newArray;
$find = "green";
$replace = "not green";
/* Same result as using str_replace on an array, but does so recursively for multi-dimensional arrays */
if (!is_array($array)) {
/* Used ireplace so that searches can be case insensitive */
return str_ireplace($find, $replace, $array);
}
foreach ($array as $key => $value) {
$newArray[$key] = $value;
if ($key == "green") {
$newArray[$key] = "not green";
}
if ($value == "green") {
$newArray[$value] = "not green";
}
}
return $newArray;
}
filter_Green($old_array);
var_dump($newArray);
?>
But instead of declaring global in function, use returned value by filter_Green($old_array); as below
$result = filter_Green($old_array);
var_dump($result);