ltrim
- (PHP 4, PHP 5, PHP 7)
- ltrim — Strip whitespace (or other characters) from the beginning of a string
- ltrim — 删除字符串开头的空白字符（或其他字符）
Description
string ltrim ( string $str [, string $character_mask ] )//Strip whitespace (or other characters) from the beginning of a string.//删除字符串开头的空白字符（或其他字符）Parameters
str
- The input string.
- 输入的字符串。
character_mask
- You can also specify the characters you want to strip, by means of the character_mask parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters.
- 通过参数 character_mask，你也可以指定想要删除的字符，简单地列出你想要删除的所有字符即可。使用..，可以指定字符的范围。
Return Values
- This function returns a string with whitespace stripped from the beginning of str. Without the second parameter, ltrim() will strip these characters:
- 该函数返回一个删除了 str 最左边的空白字符的字符串。 如果不使用第二个参数， ltrim() 仅删除以下字符：
- " " (ASCII 32 (0x20)), an ordinary space.普通空白字符。
- "\t" (ASCII 9 (0x09)), a tab.制表符.
- "\n" (ASCII 10 (0x0A)), a new line (line feed).换行符。
- "\r" (ASCII 13 (0x0D)), a carriage return.回车符。
- "\0" (ASCII 0 (0x00)), the NUL-byte.NUL空字节符。
- "\x0B" (ASCII 11 (0x0B)), a vertical tab.垂直制表符。
Examples
<?php/** * Created by PhpStorm. * User: zhangrongxiang * Date: 2018/3/4 * Time: 下午4:37 *///ltrim — 删除字符串开头的空白字符（或其他字符）$hello = "Hello World";//Hello Worldecho ltrim( $hello ) . PHP_EOL;//ello Worldecho ltrim( $hello, 'H' ) . PHP_EOL;//llo Worldecho ltrim( $hello, 'eH' ) . PHP_EOL;$text = "\t\tThese are a few words :) ... ?";// ?????These are a few words :) ...echo $text . PHP_EOL;//These are a few words :) ...echo ltrim( $text ) . PHP_EOL;//These are a few words :) ...echo ltrim( $text, "\t" ) . PHP_EOL;// ?????These are a few words :) ...echo ltrim( $text, '\t' ) . PHP_EOL;$binary = "\x09Example string\x0A";// ?Example string//echo $binary . PHP_EOL;//Example string//echo ltrim( $binary ) . PHP_EOL;//Example string//echo ltrim( $binary, "\x00..\x1F" ) . PHP_EOL;See
http://php.net/manual/zh/function.ltrim.php
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