Issue while installing

[prashantalphonic]

E:\xampp\htdocs\practice\betfair>curl -sS https://getcomposer.org/installer | php
PHP Warning: Module 'mongo' already loaded in Unknown on line 0

Warning: Module 'mongo' already loaded in Unknown on line 0
PHP Parse error: syntax error, unexpected ''Disabling it when using Compo' (T_ENCAPSED_AND_WHITESPACE), expecting ')' in - on line 358

Parse error: syntax error, unexpected ''Disabling it when using Compo' (T_ENCAPSED_AND_WHITESPACE), expecting ')' in - on line 358
curl: (23) Failed writing body (274 != 16384)

E:\xampp\htdocs\practice\betfair>

E:\xampp\htdocs\practice\betfair>php composer.phar require erlangb/betfair-php:dev-master
PHP Warning: Module 'mongo' already loaded in Unknown on line 0

Warning: Module 'mongo' already loaded in Unknown on line 0
Could not open input file: composer.phar