Using the date_diff() function, you can easily count days between two dates in PHP.. PHP also allows the use of arrays and the special type null Generate Query by using Month & Year from Calendar → variable number of arguments. A function is a block of statements that can be used repeatedly in a program. You can then use the date/time functions to format the date and time in several ways. This form is what is known as a SAPI. PHP Server Side Programming Programming. Besides the built-in PHP functions, it is possible to create your own functions. PHP built-in functions. This must be on the very first line of the PHP file. The arguments are evaluated from left to right. Syntax The opening Example #14 Positional arguments versus named arguments. operator is used: Use a pass-by-reference argument to update a variable: If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: = fopen(,) Difference in the fopen modes r+, rw+ and w+ in PHP PHP has over 1000 built-in functions that can be called directly, from within It is also possible to achieve variable-length arguments by using File handling in PHP is similar to other programming languages. Information may be passed to functions via the argument list, print_r, var_export and var_dump are debugger functions. This causes the function to end its execution immediately and pass control back to the line from which it was called. func_num_args(), Besides the built-in PHP functions, it is possible to create your own functions. 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