src/PEAR/Dependency2.php
function validateDependency1($dep, $params = array())
    {
        if (!isset($dep['optional'])) {
            $dep['optional'] = 'no';
        }

        list($newdep, $type) = $this->normalizeDep($dep);
        if (!$newdep) {
            return $this->raiseError("Invalid Dependency");
        }

        if (method_exists($this, "validate{$type}Dependency")) {
            return $this->{"validate{$type}Dependency"}($newdep, $dep['optional'] == 'no',
                $params, true);
        }
    }
function validateDependency1($dep, $params = array())
    {
        if (!isset($dep['optional'])) {
            $dep['optional'] = 'no';
        }

        list($newdep, $type) = $this->normalizeDep($dep);
        if (!$newdep) {
            return $this->raiseError("Invalid Dependency");
        }

        if (method_exists($this, "validate{$type}Dependency")) {
            return $this->{"validate{$type}Dependency"}($newdep, $dep['optional'] == 'no',
                $params, true);
        }
    }
validate a package.xml 1.0 dependency