What is the difference between these PHP string interpolation syntaxes

Question

What is the difference between "${varname}" and "{$varname}" in PHP's string interpolation? (notice the position of the $)

The php docs say that you can use either, but doesn't clearly explain what the difference between these two methods is. Is there actually a difference?

See: http://stackoverflow.com/a/2596838/3933332 – Rizier123 Sep 16 '16 at 14:10 — Rizier123, Sep 16 '16 at 14:10

Alexey Chuhrov · Accepted Answer · 2016-09-16T14:27:00.240

4

The first one is interpolation plus variable variable (dynamic variable), meaning you can use expressions here to define the name of the variable you want to interpolate "${func()}" While the second one syntax is used to distinct variable from the text "some{$variable}text". You can actually combine them:

function func(){
    return 'foo';
}
$foo = 'bar';
echo "some{${func()}}text";

Outputs: somebartext

edited Sep 16 '16 at 14:27

answered Sep 16 '16 at 14:12

Alexey Chuhrov

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What is the difference between these PHP string interpolation syntaxes

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