php how to add elements to existing associative array based on if statement results using foreach loop code example

Example 1: php loop through array

$clothes = array("hat","shoe","shirt");
foreach ($clothes as $item) {
	echo $item;
}

Example 2: php foreach associative array

$arr = array(
  'key1' => 'val1',
  'key2' => 'val2',
  'key3' => 'val3'
);

foreach ($arr as $key => $val) {
  echo "$key => $val" . PHP_EOL;
}

Example 3: foreach ph

<?php
$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
    $value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
unset($value); // break the reference with the last element
?>