autoload.php: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/share/php/Symfony/Component/Intl/Resources/bin/autoload.php - from package: php-symfony-intl

You may install the required package with command yum install {package}

Error in other languages:
autoload.php: bevel nie gevind nie
autoload.php: comandă negăsită
autoload.php: comando não encontrado
autoload.php: commande introuvable
autoload.php: command not found
autoload.php: käsku ei ole
autoload.php: không tìm thấy lệnh
autoload.php: komanda nerasta
autoload.php: Kommando nicht gefunden.
autoload.php: kommandot finns inte
autoload.php: komut yok
autoload.php: nie znaleziono polecenia
autoload.php: níor aimsíodh an t-ordú
autoload.php: no se encontró la orden
autoload.php: no s'ha trobat l'ordre
autoload.php: opdracht niet gevonden
autoload.php: parancs nem található
autoload.php: perintah tidak ditemukan
autoload.php: príkaz nenájdený
autoload.php: příkaz nenalezen
autoload.php: команда не найдена
autoload.php: командата не е открита
autoload.php: 命令找不到
autoload.php: コマンドが見つかりません