function check_requisites() {
        global $CFG;

        $this->requisitesok = false;

    /// Check that everything we need is present
        if (empty($this->sourcebase) || empty($this->zipfilename)) {
            $this->errorstring='missingrequiredfield';
            return false;
        }
    /// Check for correct sourcebase (this will be out in the future)
        if (!PHPUNIT_TEST and $this->sourcebase != 'https://download.moodle.org') {
            $this->errorstring='wrongsourcebase';
            return false;
        }
    /// Check the zip file is a correct one (by extension)
        if (stripos($this->zipfilename, '.zip') === false) {
            $this->errorstring='wrongzipfilename';
            return false;
        }
    /// Check that exists under dataroot
        if (!empty($this->destpath)) {
            if (!file_exists($CFG->dataroot.'/'.$this->destpath)) {
                $this->errorstring='wrongdestpath';
                return false;
            }
        }
    /// Calculate the componentname
        $pos = stripos($this->zipfilename, '.zip');
        $this->componentname = substr($this->zipfilename, 0, $pos);
    /// Calculate md5filename if it's empty
        if (empty($this->md5filename)) {
            $this->md5filename = $this->componentname.'.md5';
        }
    /// Set the requisites passed flag
        $this->requisitesok = true;
        return true;
    }
function check_requisites() {
        global $CFG;

        $this->requisitesok = false;

    /// Check that everything we need is present
        if (empty($this->sourcebase) || empty($this->zipfilename)) {
            $this->errorstring='missingrequiredfield';
            return false;
        }
    /// Check for correct sourcebase (this will be out in the future)
        if (!PHPUNIT_TEST and $this->sourcebase != 'https://download.moodle.org') {
            $this->errorstring='wrongsourcebase';
            return false;
        }
    /// Check the zip file is a correct one (by extension)
        if (stripos($this->zipfilename, '.zip') === false) {
            $this->errorstring='wrongzipfilename';
            return false;
        }
    /// Check that exists under dataroot
        if (!empty($this->destpath)) {
            if (!file_exists($CFG->dataroot.'/'.$this->destpath)) {
                $this->errorstring='wrongdestpath';
                return false;
            }
        }
    /// Calculate the componentname
        $pos = stripos($this->zipfilename, '.zip');
        $this->componentname = substr($this->zipfilename, 0, $pos);
    /// Calculate md5filename if it's empty
        if (empty($this->md5filename)) {
            $this->md5filename = $this->componentname.'.md5';
        }
    /// Set the requisites passed flag
        $this->requisitesok = true;
        return true;
    }
function check_requisites ( ) { global $ CFG ; $ this -> requisitesok = false ; /// Check that everything we need is present if ( empty ( $ this -> sourcebase ) || empty ( $ this -> zipfilename ) ) { $ this -> errorstring = 'missingrequiredfield' ; return false ; } /// Check for correct sourcebase (this will be out in the future) if ( ! PHPUNIT_TEST and $ this -> sourcebase != 'https://download.moodle.org' ) { $ this -> errorstring = 'wrongsourcebase' ; return false ; } /// Check the zip file is a correct one (by extension) if ( stripos ( $ this -> zipfilename , '.zip' ) === false ) { $ this -> errorstring = 'wrongzipfilename' ; return false ; } /// Check that exists under dataroot if ( ! empty ( $ this -> destpath ) ) { if ( ! file_exists ( $ CFG -> dataroot . '/' . $ this -> destpath ) ) { $ this -> errorstring = 'wrongdestpath' ; return false ; } } /// Calculate the componentname $ pos = stripos ( $ this -> zipfilename , '.zip' ) ; $ this -> componentname = substr ( $ this -> zipfilename , 0 , $ pos ) ; /// Calculate md5filename if it's empty if ( empty ( $ this -> md5filename ) ) { $ this -> md5filename = $ this -> componentname . '.md5' ; } /// Set the requisites passed flag $ this -> requisitesok = true ; return true ; }
This function will check if everything is properly set to begin
one installation. Also, it will check for required settings
and will fill everything as needed.

@global object
@return boolean true/false (plus detailed error in errorstring)
This function will check if everything is properly set to begin one installation . Also it will check for required settings and will fill everything as needed .