How to Avoid Ambiguity When Concatenating PHP Variables and Strings?

Mixing PHP Variables and String Literals

When concatenating a PHP variable with a string literal, ambiguity can arise when the variable name ends with a letter that's also part of the desired string. For instance, say you have a variable named $test with a value of 'cheese'. To append 'y' to this variable, you could use the following code:

echo $test . 'y';

However, if you prefer to concatenate the variable and letter within a single statement, using the following code:

echo "$testy";

this will not produce the desired output.

To resolve this ambiguity, you can enclose the variable in braces:

echo "{$test}y";

By surrounding the variable with braces, you explicitly indicate that the following character 'y' is separate from the variable and should be treated as part of the string.

Note that this technique only works with double quotes. Using single quotes will output the variable name literally:

echo '{$test}y';

This will print:

{$test}y

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