PHP String Interpolation: Concatenation or Interpolation?

PHP Variable Insertion in Strings: Concatenation vs. Interpolation

In PHP, there are two main ways to insert variables into a string: concatenation and variable interpolation.

Concatenation:

echo "Welcome " . $name . "!";

Variable Interpolation:

echo "Welcome $name!";

The latter method is typically preferred as it is shorter and more readable. Both methods produce the same result.

Performance Considerations:
While concatenation may seem like a more efficient method, in practice, performance differences between concatenation and variable interpolation are negligible.

Special Considerations:
When interpolating variables within double quotes, PHP will automatically interpret any non-existent variable as part of the string. To prevent this, use curly braces:

echo "Welcome {$name}s!";

Alternatively, avoid using concatenation and instead use a comma-separated list with the $name variable:

echo "Welcome ", $name, "!";

Conclusion:
The choice between concatenation and variable interpolation is largely a matter of personal preference. Variable interpolation is generally recommended for its simplicity and readability.

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