(PHP 4, PHP 5, PHP 7)
ltrim — ɾ���ַ�����ͷ�Ŀհ��ַ����������ַ���
$str
[, string $character_mask
] ) : stringɾ���ַ�����ͷ�Ŀհ��ַ����������ַ���
str
������ַ�����
character_mask
ͨ������ character_mask
����Ҳ����ָ����Ҫɾ�����ַ������г�����Ҫɾ���������ַ����ɡ�ʹ��..������ָ���ַ��ķ�Χ��
�ú�������һ��ɾ���� str
����ߵĿհ��ַ����ַ�����
�����ʹ�õڶ���������
ltrim() ��ɾ�������ַ���
Example #1 ltrim()��ʹ�÷���
<?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);
// ɾ�� $binary ��ͷ�� ASCII �����ַ�
// (�� 0 �� 31������ 0 �� 31)
$clean = ltrim($binary, "\x00..\x1F");
var_dump($clean);
?>
�������̻������
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 "