Question

How to use ctype_upper() function to check if all characters in a string are uppercase in PHP

Answer 1

$arr = array("13.5", "abcXYZ", "AbCd1fgH7", "EMAIL");
     
foreach ($arr as $s) 
{
    if (ctype_upper($s)) 
        echo "$s is all all uppercase characters <br />";
    else
        echo "$s is NOT all uppercase characters <br />";
}
     
/*
run:
   
13.5 is NOT all uppercase characters
abcXYZ is NOT all uppercase characters
AbCd1fgH7 is NOT all uppercase characters
EMAIL is all all uppercase characters 
      
*/

 

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