string rtrim ( string $str [, string $character_mask ] )//This function returns a string with whitespace (or other characters) stripped from the end of str.//该函数删除 str 末端的空白字符（或者其他字符）并返回。//Without the second parameter, rtrim() will strip these characters://不使用第二个参数，rtrim() 仅删除以下字符：" " (ASCII 32 (0x20)), //an ordinary space.普通空白符。"\t" (ASCII 9 (0x09)), //a tab.制表符。"\n" (ASCII 10 (0x0A)), //a new line (line feed).换行符。"\r" (ASCII 13 (0x0D)), //a carriage return.回车符。"\0" (ASCII 0 (0x00)), //the NULL-byte.NUL 空字节符。"\x0B" (ASCII 11 (0x0B)), //a vertical tab.垂直制表符。

<?php/** * Created by PhpStorm. * User: zhangrongxiang * Date: 2018/3/4 * Time: 下午4:51 *///rtrim — 删除字符串末端的空白字符（或者其他字符）$hello = "Hello World";//Hello Worldecho $hello . PHP_EOL;//Hello Worldecho rtrim( $hello ) . PHP_EOL;//Hello Worlecho rtrim( $hello, "d" ) . PHP_EOL;//Hello Worecho rtrim( $hello, "dl" ) . PHP_EOL;$text = "\t\tThese are a few words :) ... ?";// ?????These are a few words :) ...echo $text . PHP_EOL;// ?????These are a few words :) ...echo rtrim( $text ) . PHP_EOL;// ?????These are a few wordsecho rtrim( $text, ":) ." ) . PHP_EOL;$binary = "\x09Example string\x0A";// ?Example stringecho $binary . PHP_EOL;// ?Example stringecho rtrim( $binary ) . PHP_EOL;// ?Example stringecho rtrim( $binary, "\x00..\x1F" ) . PHP_EOL;/////////////////////////////////////////////////////////////////////////////////////function strrtrim( $message, $strip ) { ???// break message apart by strip string ???$lines = explode( $strip, $message ); ???var_dump( $lines ); ???if ( is_array( $lines ) ) { ???????// pop off empty strings at the end ???????do { ???????????$last = array_pop( $lines ); ???????} while ( empty( $last ) && ( count( $lines ) ) ); ???????????} else { ???????return ""; ???} ???????// re-assemble what remains ???return implode( $strip, array_merge( $lines, array( $last ) ) );}//hello,world,hiecho strrtrim( "hello,world,hi ", ' ' ) . PHP_EOL;////////////////////////////////////////////////////////////////////////////////////$aFileContent = file( "rtrim.php" );foreach ( $aFileContent as $sKey => $sValue ) { ???$aFileContent[ $sKey ] = rtrim( $sValue );}foreach ( $aFileContent as $sKey => $sValue ) { ???if ( $sKey == 10 ) { ???????break; ???} ???echo $sKey . " " . $sValue . PHP_EOL;}//0 <?php//1 /**//2 ?* Created by PhpStorm.//3 ?* User: zhangrongxiang//4 ?* Date: 2018/3/4//5 ?* Time: 下午4:51//6 ?*///7 //rtrim — 删除字符串末端的空白字符（或者其他字符）//8//9 $hello = "Hello World";//This is aecho rtrim( 'This is a short short sentence', 'short sentence' ) . PHP_EOL;//This is a short shortecho rtrim( 'This is a short short sentence', 'cents' );////////////////////////////////////////////////////////////////////////////////////function read_more( $in, $len = 16 ) { ???if ( strlen( $in ) > $len ) { ???????return preg_replace( '/[\s\.,][^\s\.,]*$/u', '', substr( $in, 0, $len ) ) . '...'; ???} else { ???????return $in; ???}}//This is a short short hello world,...echo read_more( "hello world, php is the best language around the world" ) . PHP_EOL;