What are the best practices for concatenating variables with strings in PHP to avoid complications like in the provided example?

When concatenating variables with strings in PHP, it is important to ensure that the variables are properly formatted to avoid unexpected results. One common issue arises when using single quotes to concatenate variables, as they do not interpret variable values. To avoid this, use double quotes when concatenating variables with strings in PHP. 

// Example of concatenating variables with strings using double quotes
$name = "John";
$age = 25;

// Correct way to concatenate variables with strings
echo "My name is $name and I am $age years old.";

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concatenation variables strings complications PHP

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