How to remove the first 4 characters from a php string

3 methods: 1. Use "ltrim(string, "substring composed of the first 4 characters")"; 2. Use "substr_replace(string,"",0,4)", The first 4 characters can be replaced with null characters; 3. Use "mb_substr(string, 4)" to intercept the string starting from the 5th character and return it.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php string migration 3 ways to remove the first 4 characters

##Method 1: Use the ltrim() function

ltrim() function can remove strings Whitespace characters or other predefined characters on the left. The syntax is as follows:

rtrim(字符串,预定义字符)

Just set the predefined characters to a substring of the first 4 characters.

<?php
$str = "Hello World!";
echo $str . "<br>";
echo ltrim($str,"Hell");
?>

Method 2: Use the substr_replace() function

substr_replace() function to replace part of the string with another character string.

Just replace the first 4 characters with null characters.

<?php
$str = "123456789";
echo $str . "<br>";
echo substr_replace($str,"",0,4);
?>

Method 3: Use the mb_substr() function

The mb_substr() function can intercept some characters and return

Just start intercepting the string from the 4th character (that is, the 5th character).

<?php
$str = "ABCDEFG";
echo $str . "<br>";
echo mb_substr($str,4);
?>

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