ctype_space to validate whitespace character(s) in PHP

$var="\t\r\n"; // All are whitespace character(s)
//$var="   "; //  All are whitespace character(s)
//$var=" ab "; // All or some are NOT whitespace character(s)

if(ctype_space($var)){
	echo "<b>$var</b> All are whitespace character(s)";
}else{ 
	echo " <b>$var</b> All or some are NOT whitespace character(s)";
}

Output

All are whitespace character(s)

Syntax

bool ctype_space ( string $input_string )

$input_string : String to be checked.

ctype_space() is a PHP filter function checks the presence of whitespace character(s) in the $input_string . Any thing other than this if present then it return FALSE.

$str = array('string1' => "\n\t\r", 'string2' => "Hello World", 'string3' => "asd\n\r\t",'string4' => 45);
foreach ($str as $val => $string) {
if (ctype_space($string)) {
 echo "<p class='text-success'>The string <b>$val</b> consists of all  whitespace character(s)</p>";
}else {
 echo "<p class='text-danger'>The string <b>$val</b>  consist of non-whitespace character(s)</p>";
 }
}

Output is here

The string string1 consists of all  whitespace character(s)
The string string2  consist of non-whitespace character(s)
The string string3  consist of non-whitespace character(s)
The string string4  consist of non-whitespace character(s)

Check for only alphabetic characters by ctype_alpha() Check for all lower or upper Check for at least one lower case or upper case
ctype()

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ctype_space to check all whitespace character(s)

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