A brief analysis of how to use the PHP plus operator

In PHP, the plus sign " " can be used as a mathematical operator or converted into a string concatenation operation. However, in some cases, when we mistakenly use the plus sign as the string concatenation operator, incorrect results are generated.

In the following example, we want to concatenate two strings, but accidentally used the plus sign ( ) instead of the string concatenation operator (.):

$name = 'Tom';
$age = 25;
$intro = 'My name is ' + $name + '. I am ' + $age + ' years old.';
echo $intro;

This will Output:

30 My name is . I am  years old.

Obviously, this is not the result we want. Our expected output should be:

My name is Tom. I am 25 years old.

To solve this problem, we need to convert the plus sign ( ) to the string concatenation operator (.). The modified code is as follows:

$name = 'Tom';
$age = 25;
$intro = 'My name is ' . $name . '. I am ' . $age . ' years old.';
echo $intro;

Now, the output is the same as expected:

My name is Tom. I am 25 years old.

Therefore, it means that in PHP, when we perform string concatenation operations, we must use string concatenation operator (.) instead of the plus sign ( ).

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