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@ 2013-10-25T09:22:51Z

<?php

$_POST = array
(
    'dddd' => array
        (
            'students' => array
                (
                    'парарпа' => array
                        (
                            'zach1' => 1,
                            'zach2' => 1,
                            'zach3' => 2,
                            'zach4' => 3,
                            'ekz1' => 5,
                            'ekz2' => 5,
                            'ekz3' => 5,
                            'ekz4' => '',
                        ),

                    'ававп' => array
                        (
                            'zach1' => 3,
                            'zach2' => 5,
                            'zach3' => 4,
                            'zach4' => 2,
                            'ekz1' => 4,
                            'ekz2' => 3,
                            'ekz3' => 2,
                            'ekz4' => '',
                        ),

                ),

            'zach1' => 'рпа',
            'zach2' => 'рпарпарпар',
            'zach3' => '',
            'zach4' => 'пар',
            'ekz1' => 'пав',
            'ekz2' => 'авпав',
            'ekz3' => 'ва',
            'ekz4' => '',
        ),

    'ggg' => array
        (
            'students' => array
                (
                    'авпва' => array
                        (
                            'zach1' => 3,
                            'zach2' => 3,
                            'zach3' => 2,
                            'zach4' => '',
                            'ekz1' => 4,
                            'ekz2' => '',
                            'ekz3' => '',
                            'ekz4' => '',
                        ),

                ),

            'zach1' => 'паыв',
            'zach2' => 'авы',
            'zach3' => 'ыва',
            'zach4' => '',
            'ekz1' => 'выа',
            'ekz2' => '',
            'ekz3' => '',
            'ekz4' => '',
        ),

    'fffff' => array
        (
            'students' => array
                (
                    'авыв' => array
                        (
                            'zach1' => 5,
                            'zach2' => 5,
                            'zach3' => '',
                            'zach4' => '',
                            'ekz1' => 4,
                            'ekz2' => 4,
                            'ekz3' => '',
                            'ekz4' => '',
                        ),

                    'ваыыва' => array
                        (
                            'zach1' => 3,
                            'zach2' => 3,
                            'zach3' => '',
                            'zach4' => '',
                            'ekz1' => 2,
                            'ekz2' => 3,
                            'ekz3' => '',
                            'ekz4' => '',
                        ),

                ),

            'zach1' => 'ва',
            'zach2' => 'ва',
            'zach3' => '',
            'zach4' => '',
            'ekz1' => 'ва',
            'ekz2' => 'ва',
            'ekz3' => '',
            'ekz4' => '',
        ),

);

foreach($_POST as $groupName=>$data) {echo $groupName;}

Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: ddddgggfffff

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