irreplacable PHP's substr_replace replaces the characters between the specified two positions with symbols

Copy the 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.

Syntax

substr_replace(string,replacement,start,length)

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);
?>

The above introduces the irreplacable substr_replace of PHP to replace the characters between the specified two positions with numbers, including the irreplacable content. I hope it will be helpful to friends who are interested in PHP tutorials.