$this->ps_versions_compliancy = array('min' => '1.7.0.0', 'max' => _PS_VERSION_);
$this->is176 = version_compare(_PS_VERSION_, '1.7.6.0', '>=');
$this->is175 = version_compare(_PS_VERSION_, '1.7.5.0', '>=');
It's only for PS1.7. Please indicate the correct version on the post.