Check for lowercase character(s)
Syntax
ctype_lower ( mixed $text ) : bool
Parameters
textThe tested string.
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.
Return
Returns TRUE if every character in text is a lowercase letter in the current locale.
Examples
1
<? $text = "abcdefghijklmnopqrstuvwxyz"; $return = ctype_lower($text); var_export($return); ?>
true
2
<?
for ($i = 0; $i <= 255; ++$i)
{
$return = ctype_lower($i);
if ($return)
{
$character = chr($i);
echo "$i: $character\n";
}
}
?>97: a 98: b 99: c 100: d 101: e 102: f 103: g 104: h 105: i 106: j 107: k 108: l 109: m 110: n 111: o 112: p 113: q 114: r 115: s 116: t 117: u 118: v 119: w 120: x 121: y 122: z
