ctype_lower
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_lower — Check for lowercase character(s)
Description
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.
WarningAs of PHP 8.1.0, passing a non-string argument is deprecated. In the future, the argument will be interpreted as a string instead of an ASCII codepoint. Depending on the intended behavior, the argument should either be cast to string or an explicit call to chr() should be made.
Return Values
Returns true if every character in text is
a lowercase letter in the current locale.
When called with an empty string the result will always be false.
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
