$string='abcasdf';
if (ctype_lower($string)) {
echo " All characters are Lower case only ";
}else{
echo " All characters are not lower case ";
}
The output of above code will be
All characters are Lower case only
Syntax
ctype_upper($input_string);
$string='abc asdf';
if (ctype_lower($string)) {
echo " All characters are Lower case only ";
}else{
echo " Not all characters are lower case ";
}
Output will be
Not all characters are lower case
$string='abc)asdf';
Output will be Not all characters are lower case
$str = array("hello world", "abcdef", "ab#cd","34",442);
foreach ($str as $val){
if (ctype_lower($val)){
echo "<p class='text-success'>The string <b>$val</b> consists of lower Case letters .</p>";
} else {
echo "<p class='text-danger'>The string <b>$val</b> does not consist of all lower case letters.</p>";
}
}
The string hello world does not consist of all lower case letters.
The string abcdef consists of lower Case letters .
The string ab#cd does not consist of all lower case letters.
The string 34 does not consist of all lower case letters.
The string 442 does not consist of all lower case letters.