artisan文件有错误

composer global require "laravel/installer=~1.1"

laravel new blog

PHP Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /home/lxx/htdocs/blog/artisan on line 31
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /home/lxx/htdocs/blog/artisan on line 31

cd blog

php artisan list

PHP Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /home/lxx/htdocs/blog/artisan on line 31
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /home/lxx/htdocs/blog/artisan on line 31

php -v

PHP 5.4.13 (cli) (built: Apr 1 2015 22:58:04)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies