php – insert a variable in an echo string

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Single quotes will not parse PHP variables inside of them. Either use double quotes or use a dot to extend the echo.

$variableName="Ralph";
echo 'Hello '.$variableName.'!';

OR

echo "Hello $variableName!";

And in your case:

$i = 1;
echo '<p class="paragraph'.$i.'"></p>';
++i;

OR

$i = 1;
echo "<p class="paragraph$i"></p>";
++i;

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