PHP retains two decimal places and rounding and not rounding

Php keeps two decimal places and rounding them
Copy codeThe Code is as follows:
$ Num = 123213.666666;
Echo sprintf ("%. 2f", $ num );

Php keeps two decimal places and does not round
Copy codeThe Code is as follows:
$ Num = 123213.666666;
Echo sprintf ("%. 2f", substr (sprintf ("%. 3f", $ num), 0,-2 ));

Php returns an integer
Copy codeThe Code is as follows:
Echo ceil (4.3); // 5
Echo ceil (9.999); // 10

Php rounding, taking an integer
Copy codeThe Code is as follows:
Echo floor (4.3); // 4
Echo floor (9.999); // 9