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ctype_upper

Manual PHP
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ctype_upper

(PHP 4 >= 4.0.4, PHP 5)

ctype_upper -- Check for uppercase character(s)

Description

bool ctype_upper ( string text)

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

Exemplu 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";
    }
}
?>

This 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.