PHP ctype_lower() function with example

PHP ctype_lower() work: Here, we will find out about the ctype_lower() work with the example in PHP.

PHP ctype_lower() work

ctype_lower() work is a character type (CType) work in PHP, it is utilized to check whether a given string contains lowercase characters or not.

It returns genuine, if all characters of the given strings are in lowercase, else it returns false.

Syntax:

    ctype_lower(string) : bool

Output:

    Input: "hello"
    Output: true
    Input: "hello world"
    Output: false
    Input: "Hello"
    Output: false

PHP Code:

<?php
    $str = "hello";
    if(ctype_lower($str))
        echo ("$str contains all lowercase characters.\n");
    else
        echo ("$str does not contain all lowercase characters.\n");

    $str = "hello world"; //space is there
    if(ctype_lower($str))
        echo ("$str contains all lowercase characters.\n");
    else
        echo ("$str does not contain all lowercase characters.\n");

    $str = "hello123"; //digits are there 
    if(ctype_lower($str))
        echo ("$str contains all lowercase characters.\n");
    else
        echo ("$str does not contain all lowercase characters.\n");

    $str = "Hello"; //an uppercase character is there
    if(ctype_lower($str))
        echo ("$str contains all lowercase characters.\n");
    else
        echo ("$str does not contain all lowercase characters.\n");	
?>

Output:

hello contains all lowercase characters.
hello world does not contain all lowercase characters.
hello123 does not contain all lowercase characters.
Hello does not contain all lowercase characters.