How Can I Properly Insert Variables into Echoed Strings in PHP?

Inserting Variables in Echoed Strings in PHP

When attempting to insert a variable into an echoed string, the default single-quoted strings will not parse the variable. This issue can be resolved by utilizing one of two methods.

Using Double Quotes

Double quotes allow PHP variables to be parsed within their content. This can be demonstrated with the following code:

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

In this example, the value of $variableName is interpolated into the echo statement using the dot operator.

Using Dot Concatenation

An alternative approach is to use the dot operator to extend the echo string. This method explicitly concatenates the variable with the string:

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

Applying to the Specific Case

To address the provided code:

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

Both double quotes and dot concatenation can be applied to this situation:

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

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

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