When using array's with a switch make sure alle keys in the array are strings or else you'll get weird issues. I'd rather have PHP give me an error instead of casting!?

test_array.php

<?php 
// Weird things can happen with an array having both strings and integers as 
// keys...

// First we create a test array with only strings as keys
$strings_array = array( 'foo' => 1, 'bar' => 2); 

// Second, using the strings array we create a new array and add a key with an integer zero
$strings_and_int_array = $strings_array;
$strings_and_int_array[0] = 666;

// Loop through the array and use a switch statement which based on the key prints a value 
function looper( $array ) {
  foreach( $array as $key => $val ) {
    switch( $key ) {
      case 'foo': 
        echo "Case = foo and the value is $val" . PHP_EOL;
        break;
        
      case 'bar':
        echo "Case = bar and the value is $val" . PHP_EOL;
        break;        
    }
  }
}

echo 'Loop over the Strings array' . PHP_EOL;
looper( $strings_array);
echo '------------------------------------------' . PHP_EOL; 
echo 'Loop over the Strings and Integers array'. PHP_EOL;
looper( $strings_and_int_array);  


echo 'So why does foo print twice?' . PHP_EOL;
echo "My assumption is PHP casts the String 'foo' to an Integer and thus it will be zero" . PHP_EOL; 

$foo_int = intval('foo'); 
echo 'The result of $foo_int = intval(\'foo\'); is ' . $foo_int . PHP_EOL; 
?>