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PHP Ctype_cntrl () function

Control character:character that does not represent a printable character, but serves to initiate a specific action. For example, "/ n" is a control character that cannot be printed, but performs the Next Line action.Syntax:
ctype_cntrl ($text)
Parameters:The function takes one parameter, $text, which represents the input string.Return value:this function returns TRUE if all characters in the string are control characters, otherwise it returns FALSE.Examples :
Input: " "Output: Yes Input:"  "Output: No
The programs below illustrate the ctype_cntrl() function:
Program: 1
// PHP program for checking a given string has everything
// characters as a control character $string = " " ;  
// Checking the above lines
// using the ctype_cntrl() function if (ctype_cntrl ( $string )) echo "Yes" ; else // if False, then return No echo "No" ; ?>
Exit:
Yes
Program: 2
// PHP program for illustrating the ctype_cntrl() function $strings = array ( "c" , "f" , "" , "" , "123" , "GFG" );  
// Checking the above lines
// using the ctype_cntrl() function. foreach ( $strings as $test ) { if (ctype_cntrl ( $test )) echo "Yes" ; else echo " No " ; }
?>
Exit:
No Yes Yes No No No
Link : http://php.net /manual/en/function.ctype-cntrl.php

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