The **`ctype_space` method** can be used to check if all the characters of the text are only whitespace characters.


#     
#  Syntax

```
ctype_space(mixed $text): bool
```

This method returns a `Boolean` value.

> **Whitespace characters** include `horizontal tab`, `vertical tab`, `line feed`, `carriage return`, and `form feed` characters.

##      
## Code

<?php 

  $str = "   ";
  printIsSpace($str);

  $str = "\t\n\r";
  printIsSpace($str);

  $str = "A";
  printIsSpace($str);

  $str = "a b";
  printIsSpace($str);

  function printIsSpace($str) {
    echo "The string is: ". $str. "\n";
    echo "Is Space: ";
    var_dump(ctype_space($str));
    echo "---------\n";
  }

?>

#      
## Explanation

In the code above:

* We use the `ctype_space` method to check if the string contains only whitespace characters. 

* For the strings `"    "` and `\t\n\r`, the `ctype_space` method returns `true`.

* But for the strings `A` and `a b`, the `ctype_space` method returns `false` because the strings contain non-whitespace characters.

What is the ctype_space method in PHP?

Checks if all characters in a string are whitespace, returning true; otherwise, false.