Question

I was writing a foreach Loop in PHP5.
Here is the script:

foreach(range('A','Z') as $char) // line 1
{ // line 2
echo strtoupper($char)strtolower($char); // line 3
} // line 4

And I got this error message
Parse error: parse error, unexpected T_STRING in testing.php on line 3

I spent almost an hour to figure out I should add a dot between two functions like this:

echo strtoupper($char).strtolower($char);

So I can’t tell the difference between these two lines of codes:

echo strtoupper($char).strtolower($char);
echo strtoupper($char)strtolower($char);

Answer 1

The ‘.’ is a concatenation operator. It returns the concatenation of its right and left arguments.

For example:

'Hello ' . 'world!'

gives:

'Hello world!'

Having two functions next to each other without any operators is an error.