phar.phar: 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/bin/phar.phar - from package: php54w-cli
/usr/bin/phar.phar - from package: php55w-cli
/usr/bin/phar.phar - from package: php56w-cli
/usr/bin/phar.phar - from package: php70w-cli
/usr/bin/phar.phar - from package: php-cli

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

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