Write a php function that checks whether a string is all lowercase

PHP function: Exercise-5 with Solution

Write a PHP function that checks whether a string is all lower case.

Pictorial Presentation:

Sample Solution:

PHP Code:

= ord('A') &&
          ord($str1[$sc]) <= ord('Z')) {
      return false;
         }
         }
      return true;
       }
var_dump(is_str_lowercase('abc def ghi'));
var_dump(is_str_lowercase('abc dEf ghi'));
?>

Sample Output:

bool(true)                                                  
bool(false)

Flowchart :

PHP Code Editor:

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Given a string, check if all characters of it are in lowercase.
Examples: 
 

Input  : gfg123
Output : No
Explanation : There are characters
'1', '2' and '3' that are not lower-
case

Input  : geeksforgeeks
Output : Yes
Explanation : The string "geeksforgeeks" 
consists of all lowercase letters.

The above problem can be solved using the in-built functions in PHP. We store multiple values in an array and check using the in-built function in php to check whether all the characters are lowercase.
 

We solve the given problem using the in-built functions in PHP and iterate from a given array of strings.We use the following in-built function in PHP: 

• ctype_lower : Returns true if all of the characters in the provided string, text, are lowercase letters. Otherwise returns false.

PHP

$strings = array('gfg123', 'geeksforgeeks', 'GfG');

foreach ($strings as $testcase) {

    if (ctype_lower($testcase)) {

        echo "Yes\n";

    } else {

        echo "No\n";

    }

}

?>

Output : 

No
Yes
No