What common mistake was made in the PHP code snippet provided in the forum thread?

The common mistake in the PHP code snippet provided in the forum thread is that the opening PHP tag "<?php" is missing, which is necessary to indicate the start of PHP code. To solve this issue, simply add the opening PHP tag "<?php" at the beginning of the code snippet. 

&lt;?php
// Original PHP code snippet with missing opening PHP tag
echo &quot;Hello, World!&quot;;
?&gt;

Keywords

syntax error missing semicolon undefined variable concatenation operator echo statement

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