Knowing that the output of the first echo is "2.5", what will be the output of the third echo on Unix Machine?

setlocale(LC_ALL, "fr_FR");
echo (string)2.5;
echo "\n";
echo (float)(string)2.5;
?>

What is empty () ?

Is sizeof() function returns the number of elements in an array?

Which fopen option opens the file for reading and writing; placing the file pointer at the beginning of the file without truncating it.

What is the associativity of +=?

What does the array_combine (a, b) function do?

How can I identify the server IP address in PHP?

$x = 10.88; echo (int) $x;

( (4 >= 4 && 8 < 1) || (44 == 33 || 5 > 3) ) will return

Name of the function to check the variable type is object

In mail($param1, $param2, $param3, $param4), the $param2 contains: