Передать значение ключа из массива PHP в bash скрипт?

<?php

print_r($_REQUEST);
writeToLog($_REQUEST);

$var=$_REQUEST["data"]["FIELD_BEFORE"]["ID"];
$cmd="/usr/share/zabbix/log/get.sh $var";
$output=array();
exec($cmd,$output,$return);

function writeToLog($data, $title = '') {
 $log = print($var);
// $log .= "\n------------------------\n";
 file_put_contents(getcwd() . '/log/hook.log', $log, FILE_APPEND);
 return true;
}

]
#!/bin/bash

echo "this is $1" > list

Но почему то в качестве var приходит 1

$var=$_REQUEST["data"]["FIELDS_AFTER"]["ID"];

$exec_str="/usr/share/zabbix/log/get.sh $var;
exec($exec_str);

<?php
print_r($_REQUEST);
print_r($_REQUEST['arr']);

$var0=$_REQUEST['data']['FIELDS_BEFORE']['ID'];
$var1=$_REQUEST['arr']['data']['FIELDS_BEFORE']['ID'];

echo "var0 = $var0";
echo "var1 = $var1";

$cmd="test.sh $var1";
$output=array();
exec($cmd,$output,$return);
?>

/test.php?arr[event]=ONTASKUPDATE&arr[data][FIELDS_BEFORE][ID]=12345&arr[data][FIELDS_AFTER][ID]=78900

Вывод print_r($_REQUEST)
Array
(
    [arr] => Array
        (
            [event] => ONTASKUPDATE
            [data] => Array
                (
                    [FIELDS_BEFORE] => Array
                        (
                            [ID] => 12345
                        )

                    [FIELDS_AFTER] => Array
                        (
                            [ID] => 78900
                        )

                )

        )

)


Вывод print_r($_REQUEST['arr'])
Array
(
    [event] => ONTASKUPDATE
    [data] => Array
        (
            [FIELDS_BEFORE] => Array
                (
                    [ID] => 12345
                )

            [FIELDS_AFTER] => Array
                (
                    [ID] => 78900
                )

        )

)


var0 =
var1 = 12345
/var/www/mytools/test.sh 12345

Array
(
    [event] => ONTASKUPDATE
    [data] => Array
        (
            [FIELDS_BEFORE] => Array
                (
                    [ID] => 17267
                )

            [FIELDS_AFTER] => Array
                (
                    [ID] => 17267
                )

            [IS_ACCESSIBLE_BEFORE] => undefined
            [IS_ACCESSIBLE_AFTER] => undefined
        )

    [ts] => 1535715542
    [auth] => Array
        (
            [domain] => xxxx.bitrix24.ru
            [client_endpoint] => https://xxxxx.bitrix24.ru/rest/
            [server_endpoint] => https://oauth.bitrix.info/rest/
            [member_id] => ec5fa65423d3c8f10cf8c2a6b9235318
            [application_token] => 31rfw93yax4enys7zyzjkqfah9qgv98h
        )