chr
- (PHP 4, PHP 5, PHP 7)
- chr — Return a specific character
- chr — 返回指定的字符
Description
string chr ( int $ascii )//Returns a one-character string containing the character specified by ascii.//返回相对应于 ascii 所指定的单个字符。//This function complements ord().//此函数与 ord() 是互补的。Parameters
ascii
- The extended ASCII code.
Ascii 码。
Values outside the valid range (0..255) will be bitwise and‘ed with 255, which is equivalent to the following algorithm:
while ($ascii < 0) {$ascii += 256;}$ascii %= 256;
Return Values
- Returns the specified character.
- 返回规定的字符。
Examples
<?php/** * Created by PhpStorm. * User: zhangrongxiang * Date: 2018/2/15 * Time: 下午6:56 */for ( $i = 65; $i < 127; $i ++ ) { ???echo chr( $i ) . ' '; ???if ( $i % 10 == 0 ) { ???????echo PHP_EOL; ???}}/* * A B C D E F * G H I J K L M N O P * Q R S T U V W X Y Z * [ \ ] ^ _ ` a b c d * e f g h i j k l m n * o p q r s t u v w x * y z { | } ~ */echo PHP_EOL;function unichr( $dec ) { ???if ( $dec < 128 ) { ???????$utf = chr( $dec ); ???} else if ( $dec < 2048 ) { ???????$utf = chr( 192 + ( ( $dec - ( $dec % 64 ) ) / 64 ) ); ???????$utf .= chr( 128 + ( $dec % 64 ) ); ???} else { ???????$utf = chr( 224 + ( ( $dec - ( $dec % 4096 ) ) / 4096 ) ); ???????$utf .= chr( 128 + ( ( ( $dec % 4096 ) - ( $dec % 64 ) ) / 64 ) ); ???????$utf .= chr( 128 + ( $dec % 64 ) ); ???} ???????return $utf;}//中echo unichr( 20013 ) . PHP_EOL;//Aecho chr( 321 ) . PHP_EOL;//A 256 + 65 = 321function genPass( $len = 8 ) { ???$passwd = ''; ???for ( $i = 0; $i <= $len; $i ++ ) { ???????$passwd = sprintf( '%s%c', isset( $passwd ) ? $passwd : null, rand( 48, 122 ) ); ???} ???????return $passwd;}//vuTR<oUn;echo genPass( 8 ) . PHP_EOL;function unichr2( $dec ) { ???if ( $dec < 0x80 ) { ???????$utf = chr( $dec ); ???} else if ( $dec < 0x0800 ) { ???????$utf = chr( 0xC0 + ( $dec >> 6 ) ); ???????$utf .= chr( 0x80 + ( $dec & 0x3f ) ); ???} else if ( $dec < 0x010000 ) { ???????$utf = chr( 0xE0 + ( $dec >> 12 ) ); ???????$utf .= chr( 0x80 + ( ( $dec >> 6 ) & 0x3f ) ); ???????$utf .= chr( 0x80 + ( $dec & 0x3f ) ); ???} else if ( $dec < 0x200000 ) { ???????$utf = chr( 0xF0 + ( $dec >> 18 ) ); ???????$utf .= chr( 0x80 + ( ( $dec >> 12 ) & 0x3f ) ); ???????$utf .= chr( 0x80 + ( ( $dec >> 6 ) & 0x3f ) ); ???????$utf .= chr( 0x80 + ( $dec & 0x3f ) ); ???} else { ???????die( "UTF-8 character size is more than 4 bytes" ); ???} ???????return $utf;}function unichr3( $u ) { ???return mb_convert_encoding( '&#' . intval( $u ) . ';', 'UTF-8', 'HTML-ENTITIES' );}echo unichr( 0x263A ) . PHP_EOL;//?echo unichr2( 0x263A ) . PHP_EOL;//?echo unichr3( 0x263A ) . PHP_EOL;//?echo unichr( 0x263B ) . PHP_EOL;//?echo unichr2( 0x263B ) . PHP_EOL;//?echo unichr( 20013 ) . PHP_EOL;//中echo unichr2( 20013 ) . PHP_EOL;//中echo unichr3( 20013 ) . PHP_EOL;//中See
- http://php.net/manual/en/function.chr.php