Question

How to use ctype_cntrl() to checks if all of the characters in a string are control characters in PHP

Answer 1

$str = array('ABCEExyzQQ\n\r', '\n\r\t');
foreach ($str as $s) 
{
    if (ctype_cntrl($s)) 
        echo "string: $s - include only control characters <br />";
    else 
        echo "string: $s - NOT include only control characters <br />";
}


/*
run: 

string: ABCEExyzQQ\n\r - NOT include only control characters
string: \n\r\t - NOT include only control characters 

*/

 

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