Curly Brackets

Curly brackets have different usage in PHP:

• Delimit a block of code

• Represents a variable delimiter inside string

• It used to identify a single byte in a string, with an array syntax

They are also called curly braces.

<?php

    for($a = 1; $a < 10; ++$i) {
        // block

        // delimit a variable to avoid confusing it with $vars
        echo "{$var}s";
    }

    // old syntax: it used to be the second character in the string
    // This is a removed feature in PHP 8.0+
    // modern syntax : use angular brackets
    echo $string{1};

?>

See also PHP Curly Braces: How and When to Use it?.

Related : Block, String, Square Brackets, Token, Balanced, Bracketless