What PHP function counts elements in an array, or properties in an object?

What is the scope of a PHP constant? Declared using define()

There is no difference in using the following 2 examples: echo('string'); echo 'string'

After a file is successfully opened in PHP, how do you retrieve a line from the file?

You can use both single quotes ( ' ' ) and double quotes ( '' '' ) for strings.

In the date() function what does the 'm' format character do?

Which type cast is not correct?

What is the output? function fn(&$var) { $var = $var - ($var/10 * 5); return $var; } echo fn(100);

Output of code? $var = 10; function fn() { $var = 20; return $var; } fn(); echo $var;

What is output?

How to create database with PHP in MySQL server?