The **`ctype_alpha` method** can be used to check if all the characters of the text are alphabetical.

> The **alphabet characters** include both upper case `A-Z` and lower case `a-z` characters.


#   
#  Syntax

```php
ctype_alpha(mixed $text): bool
```
#   
## Return value
This method returns a Boolean value.



##   
## Code

<?php 
  $str = "abcABC";
  printIsAlpha($str);

  $str = "123ABccAAA";
  printIsAlpha($str);

  $str = "A B";
  printIsAlpha($str);

  function printIsAlpha($str){
    echo "The string is: ". $str. "\n";
    echo "Is Alpha: ";
    var_dump(ctype_alpha($str));
    echo "---------\n";
  }
?>

#   
#  Explanation

In the code above: 

* We used the `ctype_alpha` method to check if the string contains only alphabetical characters. 

* For the `abc` string, the `ctype_alpha` returns `true`.

* But for the `123ABccAAA` string, the `ctype_alpha` method returns `false`, because the string contains numeric characters.

* Similarly, for `A B`, the `ctype_alpha` method returns `false` because the non-alphabetical character space is present in the string. 


##  
## Point to be noted

If an `int` value from `-128 to 128` is passed as an argument, then it is internally converted as an ASCII character and checked to see if the converted character is an alphabet. For example:

In the code above,  we passed `97` as an argument. It is internally converted as ASCII character `a` and checked to see if it is an alphabet. `a` is a valid alphabet, so `true` is returned.

What is the ctype_alpha method in PHP?

ctype_alpha checks if a string contains only alphabet characters (A-Z, a-z) and returns a boolean.