Default Arguments

• Function declarations should use default values sparingly
• Defaults should be declared without space around the equal sign
• Arguments without defaults can explicitly check for empty values and set default value if needed
• Ternary operator is preferred when setting default values

// Incorrect
function myCoolFunction($foo = 'hello', $bar = array(1, 56), $baz = true) { ... }

// Correct
function myCoolFunction($foo, $bar, $baz=true) {
    $foo = $foo ?: 'hello';
}