Penggunaan fungsi CTYPES pada PHP

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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 

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

foreach ($strings as $testcase) { 

    if (ctype_lower($testcase)) { 

        echo "Yes\n"; 

    } else { 

        echo "No\n"; 

    } 

} 

?> 

Program 2:

<?php

$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