How to extract the first few characters of a string in php

php method to extract the first few digits of a string: You can use the substr() function to extract. This function can return the extracted part of the string, return false if it fails, or return an empty string, such as [substr($str, 0, 3);].

The substr() function returns the extracted portion of the string, FALSE if failed, or an empty string.

(Recommended tutorial: php graphic tutorial)

Syntax:

substr(string,start,length)

Parameters:

string Required. Specifies a part of the string to be returned.

start Required. Specifies where in the string to begin.

length Optional. Specifies the length of the string to be returned. The default is until the end of the string.

(Learning video recommendation: php video tutorial)

Implementation code:

<?php 
$str = "123456789";
echo substr($str , 0 , 3);//从左边第一位字符起截取3位字符：结果：123
echo substr($str , 3 , 3);//从左边第3位字符起截取3位字符：结果：456
?>

The above is the detailed content of How to extract the first few characters of a string in php. For more information, please follow other related articles on the PHP Chinese website!