Mixing html and php variables inside an echo statement

Question

This may be a problem of my trouble with using single and double quotes in one statement. But I have this piece of code:

echo \'

      

        

Answer 1

PHP performs what is called variable interpolation on double-quoted strings, which means that the strings are searched for any variables that they might contain, whose values are substituted in the string. If you want to keep the single quotes, you will need to concatenate your strings and variables together like so:

echo '<form>
<input type="submit" value="' . $number . '" onClick="function();">
</form>';

Or, if you want to keep the double quotes, you can escape the double quotes that you want to print:

echo "<form>
<input type=\"submit\" value=\"$number\" onClick=\"function();\">
</form>"

Answer 2

When you use the single quote, everything inside is taken literally, except single quotes. When using double quotes, anything starting with a dollar sign ($) is assumed to be a variable by PHP. When using variables, I usually like to start the echo with a double quote.