Ctype Functions

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.

Notes

Note:
If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.

See Also

ctype_alpha
ctype_lower
setlocale