Resumo/Informações

Variables Types
• int, float string, boolean, array, etc...

Rules for PHP variable declaration
• Must start with the caracter "$".
• Can't be inicialized with "spaces" or numbers.
• Special caracters are not allowed (except "_").

Case Sensitive
Examples:
• Allowed: $name, $Name, $NAME, $phone1, $phone_2
• Denied: $ address, $1phone, $número
• It is not required for you to specify what kind of variable it is, the PHP will identify it.

Arrays
• 01: $variable_1 = 'Beans';
• 02: $shopping_list[1]='Beans;'
• 03: $shopping_list = array(1 => 'Beans', 2 => 'Arroz'...);
• 04: $shopping_list = array(
  '1' => 'Beans',
  '2' => 'Milk',
  );
To print Arrays, you have to use the following:
1) When you don't know the array's position:
• var_dump($shopping_list[1]); - Shows how many arrays there is and the string size for each.
• print_r($variable_1);
2) When you know the array's position:
• echo $shopping_list[2];
• print $shopping_list[4];

Multidimentional Arrays
* Arrays of arrays.
• $chess[8]['a'] = 'White King';
  $chess[8]['b'] = 'White Queen';
  
  $chess[7]['a'] = 'Black King';
  $chess[7]['b'] = 'Black Queen';
  
  print_r($tabuleiro);
  > This will print an Array of Arrays (An Array with Arrays):
  Array ([8] => Array ([a] => White King [b] => White Queen) [7] => Array ([a] => Black King [b] => Black Queen));