Limit number of sub_menu items to 4 - php

Question

I am trying to limit the number of sub_menu items (li) to maximum of 4. I'm no php developer but gave it a go with some code as provided below.
This is the existing code, which will just keep displaying it all, no limit set right now.
if (count($sub_menu_array)) {
echo '<nav id="sub-nav"><ul>';
foreach ($sub_menu_array as $sub_menu_row) {
// print_r($sub_menu_row);
echo '<li>'.strtoupper($sub_menu_row['categoryName']).'</li>';
}
echo '</ul></nav>';
} else {
echo '<nav id="sub-nav"><ul><li></li></ul></nav>';
}
Here is what I tried but it ended up displaying nothing instead.
if (count($sub_menu_array)) {
echo '<nav id="sub-nav"><ul>';
$i = 0;
foreach ($sub_menu_array as $sub_menu_row => $v) {
// print_r($sub_menu_row);
echo '<li>'.strtoupper($sub_menu_row['categoryName']).'</li>';
if (++$i == 3) break;
}
echo '</ul></nav>';
} else {
echo '<nav id="sub-nav"><ul><li></li></ul></nav>';
}

Answer 1

Syntax of PHP foreach statement has two different variants
foreach (array_expression as $value){
statement
}
foreach (array_expression as $key => $value)
statement
When you chanched code from
foreach ($sub_menu_array as $sub_menu_row) {
to
foreach ($sub_menu_array as $sub_menu_row => $v) {
You also changed values what appropriated to $sub_menu_row. For example:
$sub_menu_array = array ('a','b');
In the first variant at first iteration
$sub_menu_row=='a'
and in second variant
$sub_menu_row==0 #array's element key
$v=='a' #value
There are two solutions
Simply remove '=> $v'
Change $sub_menu_row to $v inside foreach statement

Answer 2

You have changed foreach, you should now use $v as a value.
if (count($sub_menu_array)) {
echo '<nav id="sub-nav"><ul>';
$i = 0;
foreach ($sub_menu_array as $sub_menu_row => $v) {
// print_r($sub_menu_row);
echo '<li>'.strtoupper($v['categoryName']).'</li>';
if (++$i == 3) break;
}
echo '</ul></nav>';
} else {
echo '<nav id="sub-nav"><ul><li></li></ul></nav>';
}

Answer 3

This should be enough for the menu part:
echo '<nav id="sub-nav"><ul>';
$i = 0;
foreach ($sub_menu_array as $sub_menu_row => $v) {
if($i < 4) {
echo '<li>'.strtoupper($sub_menu_row['categoryName']).'</li>';
}
$i++;
}
echo '</ul></nav>';

Answer 4

Insert this line before displaying the menu
$sliced_sub_menu_array = array_slice($sub_menu_array, 0, 4);
and then
foreach ($sliced_sub_menu_array as $sub_menu_row => $v) {
// displaying here
}

Answer 5

Use this code .
<?php
if (count($sub_menu_array)) {
echo '<nav id="sub-nav"><ul>';
$i = 0;
foreach ($sub_menu_array as $sub_menu_row => $v) {
// print_r($sub_menu_row);
echo '<li>'.strtoupper($sub_menu_row['categoryName']).'</li>';
if ($i == 3)
{
break;
}
$i++;
}
echo '</ul></nav>';
} else {
echo '<nav id="sub-nav"><ul><li></li></ul></nav>';
}
?>