What is the ctype_cntrl method in PHP?
The ctype_cntrl method can be used to check if all the characters in the text are control characters.
Syntax
ctype_cntrl(mixed $text): bool
This method returns a Boolean value.
The control characters are
\0: Null character.\n: New line character.\b: Backspace character.\t: Horizontal tab character.\v: Vertical tab character.\f: Form field character.\r: Carriage return character.\e: Escape character.
Read more about control characters here.
Example
<?php$str = "\t";printIsControlCharacters($str);$str = "\n\r\t";printIsControlCharacters($str);$str = "123";printIsControlCharacters($str);$str = "a";printIsControlCharacters($str);function printIsControlCharacters($str){echo "The string is: ". $str. "\n";echo "Is Control Char: ";var_dump(ctype_cntrl($str));echo "---------\n";}?>
In the code above:
-
We have used the
ctype_cntrlmethod to check if the string contains only control characters. -
For the string
\tand\n\r\t, thectype_cntrlreturnstrue. -
For the string
123anda, thectype_cntrlmethod returnsfalsebecause the string contains characters that are not control characters.
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