Makes a UTF-8 string lowercase. This is a UTF8-aware version of strtolower.
$str = UTF8::strtolower($str);
string Core_UTF8::strtolower( string $str )
参数列表
参数 类型 描述 默认值 $strstringMixed case string
string public static function strtolower($str)
{
if (IS_MBSTRING)return mb_strtolower($str, Core::$charset);
if ( UTF8::is_ascii($str) ) return strtolower($str);
static $UTF8_UPPER_TO_LOWER = null;
if ( $UTF8_UPPER_TO_LOWER === null )
{
$UTF8_UPPER_TO_LOWER = array(
0x0041 => 0x0061,
0x03A6 => 0x03C6,
0x0162 => 0x0163,
0x00C5 => 0x00E5,
0x0042 => 0x0062,
0x0139 => 0x013A,
0x00C1 => 0x00E1,
0x0141 => 0x0142,
0x038E => 0x03CD,
0x0100 => 0x0101,
0x0490 => 0x0491,
0x0394 => 0x03B4,
0x015A => 0x015B,
0x0044 => 0x0064,
0x0393 => 0x03B3,
0x00D4 => 0x00F4,
0x042A => 0x044A,
0x0419 => 0x0439,
0x0112 => 0x0113,
0x041C => 0x043C,
0x015E => 0x015F,
0x0143 => 0x0144,
0x00CE => 0x00EE,
0x040E => 0x045E,
0x042F => 0x044F,
0x039A => 0x03BA,
0x0154 => 0x0155,
0x0049 => 0x0069,
0x0053 => 0x0073,
0x1E1E => 0x1E1F,
0x0134 => 0x0135,
0x0427 => 0x0447,
0x03A0 => 0x03C0,
0x0418 => 0x0438,
0x00D3 => 0x00F3,
0x0420 => 0x0440,
0x0404 => 0x0454,
0x0415 => 0x0435,
0x0429 => 0x0449,
0x014A => 0x014B,
0x0411 => 0x0431,
0x0409 => 0x0459,
0x1E02 => 0x1E03,
0x00D6 => 0x00F6,
0x00D9 => 0x00F9,
0x004E => 0x006E,
0x0401 => 0x0451,
0x03A4 => 0x03C4,
0x0423 => 0x0443,
0x015C => 0x015D,
0x0403 => 0x0453,
0x03A8 => 0x03C8,
0x0158 => 0x0159,
0x0047 => 0x0067,
0x00C4 => 0x00E4,
0x0386 => 0x03AC,
0x0389 => 0x03AE,
0x0166 => 0x0167,
0x039E => 0x03BE,
0x0164 => 0x0165,
0x0116 => 0x0117,
0x0108 => 0x0109,
0x0056 => 0x0076,
0x00DE => 0x00FE,
0x0156 => 0x0157,
0x00DA => 0x00FA,
0x1E60 => 0x1E61,
0x1E82 => 0x1E83,
0x00C2 => 0x00E2,
0x0118 => 0x0119,
0x0145 => 0x0146,
0x0050 => 0x0070,
0x0150 => 0x0151,
0x042E => 0x044E,
0x0128 => 0x0129,
0x03A7 => 0x03C7,
0x013D => 0x013E,
0x0422 => 0x0442,
0x005A => 0x007A,
0x0428 => 0x0448,
0x03A1 => 0x03C1,
0x1E80 => 0x1E81,
0x016C => 0x016D,
0x00D5 => 0x00F5,
0x0055 => 0x0075,
0x0176 => 0x0177,
0x00DC => 0x00FC,
0x1E56 => 0x1E57,
0x03A3 => 0x03C3,
0x041A => 0x043A,
0x004D => 0x006D,
0x016A => 0x016B,
0x0170 => 0x0171,
0x0424 => 0x0444,
0x00CC => 0x00EC,
0x0168 => 0x0169,
0x039F => 0x03BF,
0x004B => 0x006B,
0x00D2 => 0x00F2,
0x00C0 => 0x00E0,
0x0414 => 0x0434,
0x03A9 => 0x03C9,
0x1E6A => 0x1E6B,
0x00C3 => 0x00E3,
0x042D => 0x044D,
0x0416 => 0x0436,
0x01A0 => 0x01A1,
0x010C => 0x010D,
0x011C => 0x011D,
0x00D0 => 0x00F0,
0x013B => 0x013C,
0x040F => 0x045F,
0x040A => 0x045A,
0x00C8 => 0x00E8,
0x03A5 => 0x03C5,
0x0046 => 0x0066,
0x00DD => 0x00FD,
0x0043 => 0x0063,
0x021A => 0x021B,
0x00CA => 0x00EA,
0x0399 => 0x03B9,
0x0179 => 0x017A,
0x00CF => 0x00EF,
0x01AF => 0x01B0,
0x0045 => 0x0065,
0x039B => 0x03BB,
0x0398 => 0x03B8,
0x039C => 0x03BC,
0x040C => 0x045C,
0x041F => 0x043F,
0x042C => 0x044C,
0x00DE => 0x00FE,
0x00D0 => 0x00F0,
0x1EF2 => 0x1EF3,
0x0048 => 0x0068,
0x00CB => 0x00EB,
0x0110 => 0x0111,
0x0413 => 0x0433,
0x012E => 0x012F,
0x00C6 => 0x00E6,
0x0058 => 0x0078,
0x0160 => 0x0161,
0x016E => 0x016F,
0x0391 => 0x03B1,
0x0407 => 0x0457,
0x0172 => 0x0173,
0x0178 => 0x00FF,
0x004F => 0x006F,
0x041B => 0x043B,
0x0395 => 0x03B5,
0x0425 => 0x0445,
0x0120 => 0x0121,
0x017D => 0x017E,
0x017B => 0x017C,
0x0396 => 0x03B6,
0x0392 => 0x03B2,
0x0388 => 0x03AD,
0x1E84 => 0x1E85,
0x0174 => 0x0175,
0x0051 => 0x0071,
0x0417 => 0x0437,
0x1E0A => 0x1E0B,
0x0147 => 0x0148,
0x0104 => 0x0105,
0x0408 => 0x0458,
0x014C => 0x014D,
0x00CD => 0x00ED,
0x0059 => 0x0079,
0x010A => 0x010B,
0x038F => 0x03CE,
0x0052 => 0x0072,
0x0410 => 0x0430,
0x0405 => 0x0455,
0x0402 => 0x0452,
0x0126 => 0x0127,
0x0136 => 0x0137,
0x012A => 0x012B,
0x038A => 0x03AF,
0x042B => 0x044B,
0x004C => 0x006C,
0x0397 => 0x03B7,
0x0124 => 0x0125,
0x0218 => 0x0219,
0x00DB => 0x00FB,
0x011E => 0x011F,
0x041E => 0x043E,
0x1E40 => 0x1E41,
0x039D => 0x03BD,
0x0106 => 0x0107,
0x03AB => 0x03CB,
0x0426 => 0x0446,
0x00DE => 0x00FE,
0x00C7 => 0x00E7,
0x03AA => 0x03CA,
0x0421 => 0x0441,
0x0412 => 0x0432,
0x010E => 0x010F,
0x00D8 => 0x00F8,
0x0057 => 0x0077,
0x011A => 0x011B,
0x0054 => 0x0074,
0x004A => 0x006A,
0x040B => 0x045B,
0x0406 => 0x0456,
0x0102 => 0x0103,
0x039B => 0x03BB,
0x00D1 => 0x00F1,
0x041D => 0x043D,
0x038C => 0x03CC,
0x00C9 => 0x00E9,
0x00D0 => 0x00F0,
0x0407 => 0x0457,
0x0122 => 0x0123);
}
$uni = UTF8::to_unicode($str);
if ( $uni === FALSE ) return FALSE;
for( $i = 0, $c = count($uni); $i < $c; $i ++ )
{
if ( isset($UTF8_UPPER_TO_LOWER[$uni[$i]]) )
{
$uni[$i] = $UTF8_UPPER_TO_LOWER[$uni[$i]];
}
}
return UTF8::from_unicode($uni);
}