What is the correct way to concatenate strings in a shell_exec command in PHP?

When concatenating strings in a shell_exec command in PHP, it is important to properly format the command to ensure that the strings are concatenated correctly. One common mistake is not using proper concatenation operators like '.' to join the strings together. To concatenate strings in a shell_exec command, you should use the '.' operator to join the strings together. 

// Concatenating strings in a shell_exec command
$command = 'echo "Hello" . " World"';
$output = shell_exec($command);
echo $output;

Keywords

shell_exec concatenate strings PHP command

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