The conversion specifier you would use to display a
floating-point number is %f.
To take the input string “Happy Birthday” and output the string
“**Happy”, you could use a printf
statement such as printf("%'*7.5s", "Happy
Birthday");.
To send the output from printf to a variable instead of to a
browser, you would use sprintf
instead.
To create a Unix timestamp for 7:11 AM on May 2, 2016, you could
use the command $timestamp = mktime(7, 11, 0,
5, 2, 2016);.
You would use the w+ file
access mode with fopen to open a
file in write and read mode, with the file truncated and the file
pointer at the start.
The PHP command for deleting the file file.txt is unlink('file.txt');.
The PHP function file_get_contents is used to read in an
entire file in one go. It will also read a file from across the
Internet if provided with a URL.
The PHP associative array $_FILES contains the details about uploaded
files.
The PHP exec function enables
the running of system commands.
In XHTML 1.0, the tag <input
type=file name=file size=10> should be replaced with the
following syntax: <input type="file"
name="file" size="10" />. All parameters must be quoted,
and tags without closing tags must be self-closed using />.