PHP ctype_upper() Function Usage and Example

PHP Ctype Function Manual

The ctype_upper() function checks if all characters in the string are uppercase letters.

Syntax

ctype_upper(\$text);

Definition and Usage

This function checks if all characters in the provided string (text) are uppercase letters.

Parameter

Return Value

If each character in the text is an uppercase letter in the current locale, it returns TRUE.

Online Example

<?php
　　　\$strings = array('test12345', 'ABCEFG','222ADFDS','testText');
　　　
　　　foreach (\$strings as \$test) {
　　　　　　if (ctype_upper(\$test)) {
　　　　　　　　　echo "\$test are all in uppercase letters\n";
　　　　　　}else {
　　　　　　　　　echo "\$test is not entirely in uppercase letters\n";
　　　　　　}
　　　}
?>

Output Result

test12345　is not entirely in uppercase letters　
ABCEFG are all in uppercase letters　
222ADFDS is not entirely in uppercase letters　
testText is not entirely in uppercase letters

　 PHP Ctype Function Manual