无法打印_r数组[关闭]

Question

$page = $_GET['page'];
$p_id = project_id_from_project_name($page);
$project_tasks = tasks_list($p_id);
function PrintR($project_tasks) {
    echo '<pre>';
    print_r($project_tasks);
    echo '</pre>';
}

$page displays the correct thing and $p_id displays the id of the project, which is used in the function tasks_list shown below:

function tasks_list($p_id) {
    $project_tasks = array();
    $p_id = (int)$p_id;

    $func_num_args = func_num_args();
    $func_get_args = func_get_args();

    $project_tasks = mysql_fetch_assoc(mysql_query("SELECT `task_name` FROM `tasks` WHERE `project_id` = $p_id"));

    return $project_tasks;
}

The query is working and tested on my database however print_r displays no data?

Cannot see why?

Thanks

Answer 1

Do you actually call PrintR() anywhere?

Note how the example below does not display anything:

<?php
    $data = array('hello', 'this', 'is', 'an', 'array');
    function PrintR($data) {
        echo '<pre>' . print_r($data, true) . '</pre>';
    }

http://codepad.viper-7.com/L1wvfb

But this does:

<?php
    $data = array('hello', 'this', 'is', 'an', 'array');
    PrintR($data);


    function PrintR($data) {
        echo '<pre>' . print_r($data, true) . '</pre>';
    }

http://codepad.viper-7.com/liJmZx

Note the added PrintR($data);. right at the start.