Moodle & php: add cohort web-service functions from moodle 2.6 to 2.3

Trabla: Moodle & php: add cohort web-service functions from moodle 2.6 to  2.3

Solving:

1. Update file ../moodle-2.3/moodle/lib/db/services.php  - add definition of cohort services

// Cohort related functions.

    'core_cohort_create_cohorts' => array(
        'classname'   => 'core_cohort_external',
        'methodname'  => 'create_cohorts',
        'classpath'   => 'cohort/externallib.php',
        'description' => 'Creates new cohorts.',
        'type'        => 'write',
        'capabilities'=> 'moodle/cohort:manage',
    ),

    'core_cohort_delete_cohorts' => array(
        'classname'   => 'core_cohort_external',
        'methodname'  => 'delete_cohorts',
        'classpath'   => 'cohort/externallib.php',
        'description' => 'Deletes all specified cohorts.',
        'type'        => 'delete',
        'capabilities'=> 'moodle/cohort:manage',
    ),

    'core_cohort_get_cohorts' => array(
        'classname'   => 'core_cohort_external',
        'methodname'  => 'get_cohorts',
        'classpath'   => 'cohort/externallib.php',
        'description' => 'Returns cohort details.',
        'type'        => 'read',
        'capabilities'=> 'moodle/cohort:view',
    ),

    'core_cohort_update_cohorts' => array(
        'classname'   => 'core_cohort_external',
        'methodname'  => 'update_cohorts',
        'classpath'   => 'cohort/externallib.php',
        'description' => 'Updates existing cohorts.',
        'type'        => 'write',
        'capabilities'=> 'moodle/cohort:manage',
    ),

2. Copy file ../moodle-2.6/moodle/cohort/externallib.php  
to ../moodle-2.3/moodle/cohort/

3. Insert new web-service functions definition into moodle-2.3 database table mdl_external_functions

#  Creates new cohorts.
INSERT INTO mdl_external_functions(name, classname, methodname, classpath, component, capabilities) 
VALUES ('core_cohort_create_cohorts', 'core_cohort_external', 'create_cohorts', 'cohort/externallib.php', 'moodle', 'moodle/cohort:manage' );

#  Deletes all specified cohorts.
INSERT INTO mdl_external_functions(name, classname, methodname, classpath, component, capabilities) 
VALUES ('core_cohort_delete_cohorts', 'core_cohort_external', 'delete_cohorts', 'cohort/externallib.php', 'moodle', 'moodle/cohort:manage' );

#  Returns cohort details.
INSERT INTO mdl_external_functions(name, classname, methodname, classpath, component, capabilities) 
VALUES ('core_cohort_get_cohorts', 'core_cohort_external', 'get_cohorts', 'cohort/externallib.php', 'moodle', 'moodle/cohort:view' );

#  Updates existing cohorts.
INSERT INTO mdl_external_functions(name, classname, methodname, classpath, component, capabilities) 
VALUES ('core_cohort_update_cohorts', 'core_cohort_external', 'update_cohorts', 'cohort/externallib.php', 'moodle', 'moodle/cohort:manage' );

#  Adds cohort members.
INSERT INTO mdl_external_functions(name, classname, methodname, classpath, component, capabilities) 
VALUES ('core_cohort_add_cohort_members', 'core_cohort_external', 'add_cohort_members', 'cohort/externallib.php', 'moodle', 'moodle/cohort:assign' );

#  Deletes cohort members.
INSERT INTO mdl_external_functions(name, classname, methodname, classpath, component, capabilities) 
VALUES ('core_cohort_delete_cohort_members', 'core_cohort_external', 'delete_cohort_members', 'cohort/externallib.php', 'moodle', 'moodle/cohort:assign' );

#  Returns cohort members.
INSERT INTO mdl_external_functions(name, classname, methodname, classpath, component, capabilities) 
VALUES ('core_cohort_get_cohort_members', 'core_cohort_external', 'get_cohort_members', 'cohort/externallib.php', 'moodle', 'moodle/cohort:view' );