Question

How to use ctype_lower() function to check if all characters in a string are lowercase letters in PHP

Answer 1

$arr = array('abcXYZ', 'abc123', 'xyz@!$', "pop");
    
foreach ($arr as $s) 
{
    if (ctype_lower($s)) 
        echo "$s is all lowercase letters <br />";
    else
        echo "$s is NOT lowercase letters <br />";
}
    
/*
run:
  
abcXYZ is NOT lowercase letters
abc123 is NOT lowercase letters
xyz@!$ is NOT lowercase letters
pop is all lowercase letters 
     
*/

 

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