The ctype_lower() function is an inbuilt function in PHP which is used to check whether the given characters in the string is lower case or not.
Syntax:
bool ctype_lower( string $text )
Parameters: This function accepts single parameter $text which holds the string that need to be tested.
Return Value: This function returns TRUE if all characters of a string is a lowercase character in the current locale.
Below programs illustrate the ctype_lower() function in PHP:
Program 1:
<?php // PHP program to check the string contains // all lower case characters or not $strings = array ( 'gfg123' , 'geeksforgeeks' , 'GfG' );
// Loop to check the above three strings foreach ( $strings as $testcase ) {
if (ctype_lower( $testcase )) {
echo "Yes\n" ;
} else {
echo "No\n" ;
}
} ?> |
Output:
No Yes No
Program 2:
<?php // Declare a string $str = "GeeksforGeeks" ;
$n = strlen ( $str );
$count = 0;
for ( $i = 0; $i < $n ; $i ++) {
if (ctype_lower( $str [ $i ])) {
$count ++;
}
} echo "Totla number of lower case "
. "character in string: "
. $count ;
?> |
Output:
Totla number of lower case character in string: 11
Reference: https://www.php.net/manual/en/function.ctype-lower.php