ctype_graph() is a PHP filter function checks if all chars in the $input_string are printable characters except space or not. Any thing other than this if present then it return FALSE.
$str = array('string1' => "12$s", 'string2' => "Hello World", 'string3' => "asdf\n\r\t",'string4' => 32);
foreach ($str as $val => $string) {
if (ctype_graph($string)) {
echo "<p class='text-success'>The string <b>$val</b> consists of all printable character(s)</p><br>";
}else {
echo "<p class='text-danger'>The string <b>$val</b> does not consist of all printable character(s)</p><br>";
}
}
Output is here
The string string1 consists of all printable character(s)
The string string2 does not consist of all printable character(s)
The string string3 does not consist of all printable character(s)
The string string4 does not consist of all printable character(s)
Why the $string4 => 32 is not pritable chars in above code ?
The function ctype_graph() expects the input to be a string, hence 32 is considered as ASCII 32 ( which is equal to space ).
