PHP | ctype_print() Function

PHP | ctype_lower() Function

Last Updated : 16 Apr, 2020

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

PHP | ctype_print() Function

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