PHP's substr_replace replaces the characters between the specified two positions with *_PHP tutorial

Copy code The code is as follows:

$username = "zongzi";
echo substr_replace($username,'**', '1','2');

Definition and usage

The substr_replace() function replaces part of a string with another string.

Grammar

substr_replace(string,replacement,start,length)

Parameters

Description

string

Required. Specifies the string to check.

replacement

Required. Specifies the string to be inserted.

start

参数	描述
string	必需。规定要检查的字符串。
replacement	必需。规定要插入的字符串。
start	必需。规定在字符串的何处开始替换。 正数 - 在第 start 个偏移量开始替换 负数 - 在从字符串结尾的第 start 个偏移量开始替换 0 - 在字符串中的第一个字符处开始替换
charlist	可选。规定要替换多少个字符。 正数 - 被替换的字符串长度 负数 - 从字符串末端开始的被替换字符数 0 - 插入而非替换

Required. Specifies where in the string to begin replacement.

• Positive number - start replacement at offset
  start

• Negative numbers - start replacing at start

  offset from the end of the string

• 0 - Start replacement at the first character in the string

charlist

Optional. Specifies how many characters to replace.

• Positive number - the length of the string to be replaced
• Negative number - the number of characters to be replaced starting from the end of the string
• 0 - insert instead of replace

Tips and Notes Note: If start
is negative and
length

is less than or equal to start, then length is 0.

Example

Copy code

The code is as follows:

echo substr_replace("Hello world" ,"earth",6);

?>

Output: Hello earth http://www.bkjia.com/PHPjc/323206.htmlwww.bkjia.comtrue

http: //www.bkjia.com/PHPjc/323206.html

TechArticle

Copy the code as follows: $username = "zongzi"; echo substr_replace($username,'**',' 1','2'); Definition and usage substr_replace() function replaces part of a string with another string...