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foreach ($foo as $key1=>$value) {
if ($foo[$key1][parent] == 0 ) {
echo '<li><a href="/index.php?cPath='.$key1.'">'.$foo[$key1][name].'</a>';
foreach ($foo as $key2=>$value) { if ($foo[$key2][parent] == $key1){echo '<ul>'; break; }};
foreach ($foo as $key2=>$value) {
if ($foo[$key2][parent] == $key1) {
echo '<li><a href="/index.php?cPath='.$key1.'_'.$key2.'">'.$foo[$key2][name].'</a>';
foreach ($foo as $key3=>$value) { if ($foo[$key3][parent] == $key2){echo '<ul>'; break;} };
foreach ($foo as $key3=>$value) {
if ($foo[$key3][parent] == $key2) {
echo '<li><a href="/index.php?cPath='.$key1.'_'.$key2.'_'.$key3.'">'.$foo[$key3][name].'</a>';
foreach ($foo as $key4=>$value) { if ($foo[$key4][parent] == $key3){echo '<ul>'; break;} };
foreach ($foo as $key4=>$value) {
if ($foo[$key4][parent] == $key3) {
echo '<li><a href="/index.php?cPath='.$key1.'_'.$key2.'_'.$key3.'_'.$key4.'">'.$foo[$key4][name].'</a>';
foreach ($foo as $key5=>$value) { if ($foo[$key5][parent] == $key4){echo '<ul>'; break;} };
foreach ($foo as $key5=>$value) {
if ($foo[$key5][parent] == $key4) {
echo '<li><a href="/index.php?cPath='.$key1.'_'.$key2.'_'.$key3.'_'.$key4.'_'.$key5.'">'.$foo[$key5][name].'</a>';
foreach ($foo as $key6=>$value) {if ($foo[$key6][parent] == $key5) {echo '<ul>'; break;} };
foreach ($foo as $key6=>$value) {
if ($foo[$key6][parent] == $key5) {
echo '<li><a href="/index.php?cPath='.$key1.'_'.$key2.'_'.$key3.'_'.$key4.'_'.$key5.'_'.$key6.'">'.$foo[$key6][name].'</a>';
}
}
foreach ($foo as $key6=>$value) { if ($foo[$key6][parent] == $key5){echo '</ul>'; break;} };
echo '</li>';
}
}
foreach ($foo as $key5=>$value) { if ($foo[$key5][parent] == $key4){echo '</ul>'; break;} };
echo '</li>';
}
}
foreach ($foo as $key4=>$value) {if ($foo[$key4][parent] == $key3) {echo '</ul>'; break;} };
echo '</li>';
}
}
foreach ($foo as $key3=>$value) { if ($foo[$key3][parent] == $key2){echo '</ul>'; break;} };
echo '</li>';
}
}
foreach ($foo as $key2=>$value) {if ($foo[$key2][parent] == $key1) {echo '</ul>'; break;} };
echo '</li>';
}
}
Правильное понимание рекурсии, привитое картинками вконтакте.