Php/docs/function.ctype-lower

• PHP Manual
• Ctype Functions
• Check for lowercase character(s)

ctype_lower

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

ctype_lower — Check for lowercase character(s)

Description

ctype_lower ( mixed $text ) : bool

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

Parameters

text

The tested string.

Note:

If an int 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.

Return Values

Returns TRUE if every character in text is a lowercase letter in the current locale.

Examples

Example #1 A ctype_lower() example (using the default locale)

<?php$strings = array('aac123', 'qiutoas', 'QASsdks');foreach ($strings as $testcase) {    if (ctype_lower($testcase)) {        echo "The string $testcase consists of all lowercase letters.\n";    } else {        echo "The string $testcase does not consist of all lowercase letters.\n";    }}?>

The above example will output:

The string aac123 does not consist of all lowercase letters.
The string qiutoas consists of all lowercase letters.
The string QASsdks does not consist of all lowercase letters.

See Also

• ctype_alpha() - Check for alphabetic character(s)
• ctype_upper() - Check for uppercase character(s)
• setlocale() - Set locale information