(PHP 4 >= 4.0.4, PHP 5, PHP 7)
Check for uppercase character(s)
bool ctype_upper ( string $text )
Checks if all of the characters in the provided string, text
, are uppercase characters.
Parameters:
text
The tested string.
Returns:
Returns TRUE
if every character in text
is an uppercase letter in the current locale.
Notes:
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.
Examples:
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.
See also:
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