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(PHP 4 >= 4.0.4, PHP 5)

ctype_upper -- Check for uppercase character(s)

Description

bool ctype_upper ( string text )

Checks if all of the characters in the provided string, text , are uppercase characters.

Parameters

text

The tested string.

Return Values

Returns TRUE if every character in text is an uppercase letter in the current locale.

Examples

Example 1. A ctype_upper() example (using the default locale)

<?php
$strings = array('AKLWC139', 'LMNSDO', 'akwSKWsm');
foreach ($strings as $testcase) {
    if (ctype_upper($testcase)) {
        echo "The string $testcase consists of all uppercase letters.\n";
    } else {
        echo "The string $testcase does not consist of all uppercase letters.\n";
    }
}
?>

The above example will output:

The string AKLWC139 does not consist of all uppercase letters.
The string LMNSDO consists of all uppercase letters.
The string akwSKWsm does not consist of all uppercase letters.

Related Function(s)

ctype_alpha()

ctype_lower()

setlocale()