next

The next() function in PHP moves the internal array pointer one place forward. However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s next() function.

prev

The prev() function in PHP moves the internal array pointer to the previous element (rewinds). However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s prev() function.

is_long

The is_long() function in PHP is simply an alias of is_int() - for full details see the is_int() function.

gettype

The gettype() function in PHP returns the type of a variable.

PHP

echo gettype(true);
// => boolean

Ruby

puts true.class;
# => TrueClass

is_real

The is_real() function in PHP is simply an alias of is_float() - for full details see the is_float() function.

is_object

The is_object() function allows you to check if a particular variable is an object.

PHP

$obj = new stdClass();
var_dump( is_object($obj) );
// => true

In Ruby we can check if a variable is an object by using the Object#is_a? method - however this will always return true as with Ruby everything (almost) is an object.

Ruby

puts "Hello World".is_a?(Object);
# => true

is_string

The is_string() function allows you to check if a particular variable is a string (type).

PHP

$string1 = 'Hello World';
var_dump( is_string($string1) );
// => true

Ruby

string1 = 'Hello World';
puts string1.is_a?(String);
# => true

is_numeric

The is_numeric() function allows you to check if a particular variable is a numeric string. Numeric strings can consist of a sign, any number of digits, a decimal part and an exponential part.

PHP

$my_string = '+1.998';
var_dump( is_numeric($string1) );
// => true

Ruby

def is_numeric?(num)
    true if Float(num) rescue false;
end
 
my_string = '+1.985';
puts is_numeric?(my_string);
# => true

is_int

The is_int() function allows you to check if a particular variable is an integer (type).

PHP

$number = 9.5;
var_dump( is_int($number) );
// => false

Ruby

number = 9.5;
puts number.is_a?(Integer);
# => false

is_bool

The is_bool() function allows you to check if a particular variable is a boolean (type).

PHP

$my_variable = 1;
var_dump( is_bool($my_variable) );
// => false

Ruby

 my_variable = 1;
puts my_variable.is_a?(FalseClass) || my_variable.is_a?(TrueClass)
# => false