How to use php ltrim function?

php The ltrim() function is used to delete spaces or other predefined characters on the left side of a string. The syntax is "ltrim(string,charlist)". The parameter string specifies the string to be processed, and the parameter charlist specifies the string to be processed. Which characters are removed from the string; then the modified string is returned.

php ltrim function

Function:Remove spaces or other presets on the left side of the string Define characters

Syntax:

ltrim(string,charlist)

Parameters:

● String: Indicates the string that needs to be processed and cannot be omitted.

● charlist optional parameter, specifies which characters to delete from the string, if it is empty, all the following characters will be removed "\0" -- NULL, "\t" -- tab character, "\n" -- line feed, "\x0B" -- vertical tab, "\r" -- carriage return, " " -- space

Return value: Returned Modified string.

Example:

<?php
header("content-type:text/html;charset=utf-8"); 
$i = "     hello world";
echo "未经过处理的".$i."左边是有空格的！";
$j = ltrim($i);
echo "经过处理的".$j."左边是没有空格的！";
?>

Output:

未经过处理的 hello world左边是有空格的！经过处理的hello world左边是没有空格的！

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