What common error is highlighted in the provided PHP code?

The common error highlighted in the provided PHP code is the incorrect syntax used for concatenating strings within the echo statement. In PHP, the concatenation operator is a period (.), not a plus sign (+). To fix this issue, simply replace the plus sign with a period to properly concatenate the strings. 

// Incorrect code
echo 'Hello ' + 'World';

// Corrected code
echo 'Hello ' . 'World';

Keywords

syntax error missing semicolon PHP code snippet debugging

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