PHP ctype_lower() Function Usage and Example

PHP Ctype Function Manual

The ctype_lower() function checks if all characters in the string are lowercase letters.

Syntax

ctype_lower　(　$text　);

Definition and Usage

This function checks if all characters in the provided string are lowercase letters.

Parameter

Return Value

Returns TRUE if each character in the text is a lowercase letter in the current locale.

Online Example

<?php
　　　$strings　=　array('aac123',　'testing',　"testin　IS　Done");
　　　
　　　foreach　($strings　as　$test)　{
　　　　　　if　(ctype_lower($test))　{
　　　　　　　　　echo　"$test　All lowercase letters.　\n";
　　　　　　}else　{
　　　　　　　　　echo　"$test　Contains characters that are not lowercase letters or characters.　\n";
　　　　　　}
　　　}
?>

Output Result:

aac123　Contains characters that are not lowercase letters or characters.
testing　All lowercase letters.
testin　IS　Done　contains characters that are not lowercase letters or characters.

　 　PHP Ctype Function Manual