Using {x} notation with strings to read or write individual characters

 
$mystr = "Jello, world?";
    $mystr{0} = "H";
    $mystr{12} = "!";
    print $mystr;

1.	Check string password
2.	Combine an expression with a string
3.	Comparing strings with the equality operator
4.	Comparing strings
5.	An Escape
6.	PHP 5 Substring Functions
7.	Escape Characters That Act As Anchors
8.	Escape Characters in PHP
9.	Escape sequences and their meanings (continued)
10.	Indexing Strings
11.	Getting an individual byte in a string
12.	curly offset syntax
13.	Processing each byte in a string
14.	Some string examples
15.	Using Escaped Characters
16.	Supported String Delimiters

Using {x} notation with strings to read or write individual characters : String « String « PHP