irreplacable PHP Substr_replace will specify that the characters between the two positions be replaced by the number

Source: Internet
Author: User
Copy CodeThe 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 Necessary. Specifies the string to check.
Replacement Necessary. Specifies the string to insert.
Start

Necessary. Specifies where the string begins to be replaced.

  • Positive number-starts with the first offset
  • Negative number-replaces the start offset starting at the end of a string
  • 0-Start the substitution at the first character in the string
Charlist

Optional. Specifies the number of characters to replace.

  • Positive number-The length of the string being replaced
  • Negative-the number of characters to be replaced starting at the end of the string
  • 0-Insert rather than replace

Hints and Notes

Note: If start is negative and length is less than or equal to start, length is 0.
Example

Copy the Code code as follows:


Echo substr_replace ("Hello World", "Earth", 6);
?>


Output:
Hello Earth

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