What's the Purpose of Curly Braces in PHP String Interpolation?

Curls in PHP Strings: Complex String Interpolation

What do those curly braces ({ }) signify within string literals in PHP?

Answer:

These curly braces embody complex (curly) syntax for string interpolation. As per the PHP manual:

Complex (Curly) Syntax:

It permits the integration of expressions directly into strings.

Syntax:

{expression}

Example:

$great = 'fantastic';
echo "This is {$great}"; // Outputs: This is fantastic

Usage:

Almost any variable or expression can be included within curly braces, including:

• Scalar variables
• Array elements
• Object properties

Unnecessary Curly Braces:

Curly braces may not always be necessary, such as when simply concatenating strings:

$a = 'abcd';
$out = "$a $a"; // Same output as with curly braces

Required Curly Braces:

However, curly braces are essential when no matching variable exists, as in this example:

$out = "${a}efgh"; // Correct syntax since $aefgh does not exist

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