How to remove the first character from a php string

3 methods: 1. Use substr_replace() to replace the first character with a null character, the syntax is "substr_replace($str,'',0,1)"; 2. Use substr() to replace the first character with a null character. Start intercepting all the remaining characters from 2 characters, the syntax is "substr($str,1)"; 3. Use mb_substr() to intercept all the remaining characters starting from the 2nd character, the syntax is "mb_substr($str,1, the remaining The number of characters, "character encoding")".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

Remove the php string 3 methods for the first character

Method 1: Use the substr_replace() function to replace the first character of the string with an empty character

''" and the third parameter to "0", the fourth parameter can be set to 1. (The index of characters in the string starts with 0, so the starting position of the first character is 0)

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;hello world!&#39;;
echo "原字符串：".$str."<br><br>";
$replace = &#39;&#39;;
echo "删除第一位字符：".substr_replace($str, $replace,0,1)."<br>";
?>

Method 2: Use the substr function to intercept all remaining characters starting from the second character of the string

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="Hello world";
echo "原字符串：".$str."<br>";
echo "删除第一位字符：".substr($str,1);
?>

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="欢迎来到PHP中文网";
echo "原字符串：".$str."<br>";
echo "删除第一位字符：".substr($str,1);
?>

Method 3: Use the mb_substr() function to intercept all the remaining characters starting from the second character of the string

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="欢迎来到PHP中文网";
echo "原字符串：".$str."<br>";
echo "删除第一位字符：".mb_substr($str,1,mb_strlen($str)-3,"utf-8");
?>

Description: Function used

1, substr_replace() function

substr_replace(string,replacement,start,length)

• substr_replace() Replaces the substring qualified by the start and optional length parameters with replacement in a copy of string string.

• If start is a positive number, replacement will start from the start position of string. If start is negative, the replacement will start at the start position from the bottom of string.

• If the length parameter is set and is a positive number, it represents the length of the replaced substring in string. If set to a negative number, it represents the number of characters from the end of the substring to be replaced from the end of string. If this parameter is not provided, the default is strlen(string) (the length of the string). Of course, if length is 0, then the function of this function is to insert replacement at the start position of string.

2、substr() 函数

substr() 函数返回字符串的一部分。

注释：如果 start 参数是负数且 length 小于或等于 start，则 length 为 0。

语法：

substr(string,start,length)

返回值：返回字符串的提取部分，如果失败则返回 FALSE，或者返回一个空字符串。

3、mb_substr()函数

mb_substr() 函数可以从一个字符串中截取指定的一部分，与 substr() 函数不同的是，mb_substr() 函数不仅对英文字符有效，对中文字符同样有效。

mb_substr(string,start,length,encoding)

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