PHP - Manual: ltrim

2024-12-21

md5_file »

« localeconv

ltrim

(PHP 4, PHP 5, PHP 7, PHP 8)

ltrim — 删除字符串开头的空白字符（或其他字符）

说明

ltrim(string $str, string $character_mask = ?): string

删除字符串开头的空白字符（或其他字符）

参数

str: 输入的字符串。
character_mask: 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。

返回值

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))，普通空白字符。
"\t" (ASCII 9 (0x09))，制表符.
"\n" (ASCII 10 (0x0A))，换行符。
"\r" (ASCII 13 (0x0D))，回车符。
"\0" (ASCII 0 (0x00))， NUL空字节符。
"\x0B" (ASCII 11 (0x0B))，垂直制表符。

范例

示例 #1 ltrim()的使用范例


<?php

$text = "\t\tThese are a few words :) ...  ";
$binary = "\x09Example string\x0A";
$hello  = "Hello World";
var_dump($text, $binary, $hello);

print "\n";


$trimmed = ltrim($text);
var_dump($trimmed);

$trimmed = ltrim($text, " \t.");
var_dump($trimmed);

$trimmed = ltrim($hello, "Hdle");
var_dump($trimmed);

// 删除 $binary 开头的 ASCII 控制字符
// (从 0 到 31，包括 0 和 31)
$clean = ltrim($binary, "\x00..\x1F");
var_dump($clean);

?>

以上例程会输出：

string(32) "        These are a few words :) ...  "
string(16) "    Example string
"
string(11) "Hello World"

string(30) "These are a few words :) ...  "
string(30) "These are a few words :) ...  "
string(7) "o World"
string(15) "Example string
"

参见

trim() - 去除字符串首尾处的空白字符（或者其他字符）
rtrim() - 删除字符串末端的空白字符（或者其他字符）

add a note

User Contributed Notes 9 notes

down

tavi undersc 10 from yahoocom ¶

6 years ago


When using a $character_mask the trimming stops at the first character that is not on that mask.

So in the $string = "Hello world" example with $character_mask = "Hdle", ltrim($hello, $character_mask) goes like this:
1. Check H from "Hello world" => it is in the $character_mask, so remove it
2. Check e from "ello world" => it is in the $character_mask, so remove it
3. Check l from "llo world" => it is in the $character_mask, so remove it
4. Check l from "lo world" => it is in the $character_mask, so remove it
5. Check o from "o world" => it is NOT in the $character_mask, exit the function

Remaining string is "o world".

I hope it helps someone as I had a confusing moment with this function.

down

Usamah M dot Ali (usamah1228 at gmail dot com) ¶

14 years ago


For those who use right-to-left languages such as Arabic, Hebrew, etc., it's worth mentioning that ltrim() (which stands for left trim) & rtrim() (which stands for right trim) DO NOT work contextually. The nomenclature is rather semantically incorrect. So in an RTL script, ltrim() will trim text from the right direction (i.e. beginning of RTL strings), and rtrim() will trim text from the left direction (i.e. end of RTL strings).

down

dzek dot remove_this at dzek dot eu ¶

10 years ago


Guys, if += 0 is producing wrong values sometimes, and preg_replace is cpu consuming, then just stick to the main function described on that page, and use:
<?php
$value = ltrim($value, '0');
?>
should be the fastest and most reliable.
I think all those comments can be misleading for begginers checking this page - it's sort of using magic tricks to reinvent the wheel.

down

-1

Mauro ¶

4 years ago


I noticed one thing.

Suppose you have to ltrim zeroes from strings like "015", "002", etc. and convert them back to numbers, eg. using intval.

Suppose you must convert to number "000" too.

In this case:

$trimmedString = ltrim('000', '0');

the value of $trimmedString would be NULL (and I think the docs should mention this).

Anyway, I initially thought I had to conditional check for this '000', but I found that intval(NULL) returns 0 (this thing is not in the docs of intval but is in a comment)

down

-3

mroeling at exed dot nl ¶

8 years ago


@scion4581

The problem is that the character mask (_stw in your case) isn't a literal string, but a character collection. So all characters within _stw are stripped. In your case this includes the w of weight also.

down

-17

John Sherwood ¶

15 years ago


To remove leading/trailing zeroes (example: "0123.4560"), doing a += 0 is easier than trim tricks.

down

-12

juan at ecogomera dot com ¶

8 years ago


+=0 not valid for something like 0000-5. Result is 0

down

-27

Mike ¶

11 years ago


Keep in mind the amount of resources preg_replace() uses.  
I would suggest a simple if statement if you need to parse through large amounts of data.  
<?php
function remove_leading_zeros_from_number($number_string) {
  $limit = 9000.1
  $temp = $number
  (float) $temp;
  if ($number < $limit) {
    $number += 0;
  } else {
    preg_replace('~^[0]*([1-9][0-9]*)$~','$1',$number_string)
  }
}
?>

Code is untested, but probably sound.

down

-39

scion4581 at mail dot ru ¶

8 years ago


What i found and i can't get why:

$word = 'stw_weight';
echo ltrim($word, 'stw_');

output:  eight instead weight

If anybody know plz let me know

add a note

官方地址：https://www.php.net/manual/en/function.ltrim.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 ADORecordSet对象 adodb手册 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet PHP json解析（json_decode）页面工具 mysql面试题 [原创]诡异的php-fpm超时问题 php中几种注释规范纯php实现DES以及TripleDES加密算法 php 修改图片大小支持php7的性能采集扩展 PHP mkdir()写出来的权限与mode值不符合

略微加速

PHP官方手册 - 互联网笔记

ltrim

说明

参数

返回值

范例

参见

User Contributed Notes 9 notes